Emerson Liebert Static Transfer Switch User Manual

AC Power
For Business-Critical Continuity™

Liebert® Static Transfer Switch 2

User Manual–100-1000A, 50/60Hz

™

TABLE OF CONTENTS

IMPORTANT SAFETY INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

OVERVIEW OF MANUAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

1.0 SAFETY PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2.0 UNPACKING AND INSPECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

2.1 External Inspections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2.2 Unloading and Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2.2.1 Handling Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2.2.2 Unit Preparation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2.3 Internal Inspections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

3.0 LOCATION CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

3.1 Recommended Minimum Service Clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

3.2 Heat Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

3.3 Operating Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

3.4 Altitude . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

4.0 LOCATING THE LIEBERT STS2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

4.1 Leveling and Anchoring the Unit to the Floor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

4.2 Leveling of the Static Switch Without Anchoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

4.3 Leveling and Anchoring the Static Switch Using Floor Stand . . . . . . . . . . . . . . . . . . . . . . . . 8

5.0 POWER AND CONTROL WIRING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

5.1 Input And Output Power Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

5.2 Input Junction Box Installation—Optional . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

5.3 System Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

5.4 Control Wiring Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

5.5 Remote Source Selection Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

5.6 Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

6.0 OPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

6.1 Programmable Relay Board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

6.2 Optimized Transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

6.3 Distribution Cabinet With I-Line Panelboard—100-600A Units Only . . . . . . . . . . . . . . . . . 15

6.4 Input Contact Isolator Board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

6.5 Comms Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

6.6 Liebert IntelliSlot

6.7 LED Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

6.8 Remote Source Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

6.9 Key Lockout Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

6.10 Redundant Output Breaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

6.11 Input Junction Boxes and Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

6.12 Seismic Floor Anchors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

6.13 Seismic Floor Stand . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

®

Web/485 Card With Adapter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

i

7.0 INSTALLATION DRAWINGS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

8.0 INTRODUCTION TO LIEBERT STS2 OPERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

8.1 System Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

8.1.1 Redundancy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

8.1.2 Reliability and Agency Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

8.1.3 Factory Backup and Service Assistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

8.2 Modes of Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

8.2.1 Normal (Preferred Source) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

8.2.2 Transfer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

8.2.3 Transfer Inhibit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

8.2.4 Bypass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

8.3 Operator Controls. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

9.0 THEORY OF OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60

9.1 General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

9.1.1 Liebert STS2 Static Transfer Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

9.1.2 Source Transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

9.1.3 Automatic Transfer/Retransfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

9.1.4 Emergency Transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

9.1.5 Load Current Transfer Inhibit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

9.1.6 SCR Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

9.1.7 On/Off Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

9.2 Detailed Component Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

9.2.1 Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

9.2.2 Circuit Breakers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

9.2.3 SCRs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

9.2.4 Logic Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

9.2.5 Audible Alarm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

9.2.6 RS-232 Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

10.0 OPERATING INSTRUCTIONS FOR THE TOUCH SCREEN INTERFACE. . . . . . . . . . . . . . . . . . . .64

10.1 Normal System Turn-On . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

10.2 Manual Transfer / Preferred Source Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

10.3 Enabling Remote Source Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

10.4 Maintenance Bypass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

10.4.1 Bypass Procedures for Source 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

10.4.2 Bypass Procedures for Source 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

10.5 Normal System Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

10.5.1 Shutdown in Static Transfer Switch Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

10.5.2 Shutdown in Maintenance Bypass Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

11.0 ALARM AND FAULTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

11.1 Event Mask. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

11.2 Event and History Logs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

11.2.1 Event Log . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

11.2.2 History Log . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

11.3 Alarm Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

11.4 List of Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

ii

12.0 COMMUNICATION INTERFACES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .76

12.1 Using the RS-232 Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

12.1.1 Connecting and Using a Terminal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

12.1.2 Configuring the Liebert STS2 via the Terminal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

12.1.3 Setting Bitpacked Options with the Terminal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

12.1.4 Setting Event Masks with the Terminal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

13.0 LIEBERT STS2 TOUCH SCREEN DISPLAY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .85

13.1 Display Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

13.2 Menu Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

13.2.1 Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

13.3 Mimic Display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

13.4 Event Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

13.5 Event Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

13.6 Menu bar. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

13.6.1 Configuration Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

13.6.2 Logs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101

13.6.3 Source Transfers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102

13.6.4 Startup Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102

13.6.5 Bypass Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102

13.6.6 Help . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102

13.6.7 Logo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102

13.7 Cleaning the LCD Touch Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102

14.0 OPERATING THE LIEBERT STS2 LED DISPLAY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103

14.1 LEDs and Buttons and Key Lockout Switch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103

14.1.1 Front Panel Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103

14.1.2 LED and Push Button Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104

14.1.3 Event Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105

14.1.4 Key Lockout Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105

14.2 Operations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105

14.2.1 Normal System Turn On . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105

14.2.2 Manual Transfer / Preferred Source Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106

14.2.3 Maintenance Bypass. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108

14.2.4 Normal System Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110

15.0 SPECIFICATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111

15.1 System Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111

15.1.1 Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111

15.1.2 Input/Output Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111

15.1.3 System Current Ratings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111

15.1.4 Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112

15.1.5 Electrical Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112

15.1.6 Input Surge Suppression . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112

15.1.7 Response Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112

15.1.8 Environmental Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112

iii

15.2 System Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113

15.2.1 Frame and Enclosure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113

15.2.2 Casters, Leveling and Seismic Anchoring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113

15.2.3 Cooling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113

15.2.4 Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114

15.2.5 Circuit Breakers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114

15.2.6 Cable Entrance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114

15.2.7 Doors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114

15.2.8 Color Graphical Display or LED Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114

15.2.9 RS-232 Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115

15.2.10 Terminal Port Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115

15.2.11 RS-232 Interface Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116

15.2.12 Maintenance Bypass. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116

15.2.13 Fuseless Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116

15.2.14 Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116

16.0 EVENT MESSAGE HELP TEXT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117

17.0 MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .138

17.1 Proper Tightening of Nuts and Bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138

17.2 Testing the Liebert STS2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138

17.3 Changing the Air Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138

SUPPORT INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .139

PROGRAMMABLE RELAY BOARD SETTINGS RECORD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .140

INPUT CONTACT ISOLATOR SETTINGS RECORD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142

iv

FIGURES

Figure 1 Recommended derating for high altitude operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Figure 2 Maximum ambient temperature for full load operation at higher altitudes . . . . . . . . . . . . . . . . . . 7

Figure 3 Typical static transfer switch one-line diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Figure 4 Typical one-line diagram of two PDUs and a static transfer switch . . . . . . . . . . . . . . . . . . . . . . . 12

Figure 5 Outline drawing: 100 – 250 amp Liebert STS2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Figure 6 Outline drawing: 400 – 600 amp Liebert STS2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Figure 7 Outline drawing: 800 – 1000 amp Liebert STS2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Figure 8 Outline drawing: 100 – 250amp Liebert STS2 with a key lockout switch option . . . . . . . . . . . . . 21

Figure 9 Outline drawing: 400 – 600 amp Liebert STS2 with a key lockout switch option . . . . . . . . . . . . 22

Figure 10 Outline drawing: 800 – 1000 amp Liebert STS2 with the key lockout switch option . . . . . . . . . . 23

Figure 11 Seismic anchor drawing: 100 – 250 amp Liebert STS2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Figure 12 Seismic anchor drawing: 400 – 600 amp Liebert STS2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Figure 13 Seismic anchor drawing: 800 – 1000 amp Liebert STS2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Figure 14 Electrical field connections drawing: 100 – 250 amp Liebert STS2 with single

output breaker. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Figure 15 Electrical field connections drawing: 100 – 250 amp Liebert STS2 with dual

output breakers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Figure 16 Electrical field connections drawing: 400 – 600 amp Liebert STS2 with single

output breaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Figure 17 Electrical field connections drawing: 400 – 600 amp Liebert STS2 with dual

output breakers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Figure 18 Electrical field connections drawing: 800 – 1000 amp Liebert STS2 with single

output breaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Figure 19 Electrical field connections: 800 – 1000 amp Liebert STS2 with dual output breakers. . . . . . . . 32

Figure 20 Liebert STS2 non-automatic circuit breaker schedule . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Figure 21 Control connection location diagram: 100 – 600 amp Liebert STS2 . . . . . . . . . . . . . . . . . . . . . . . 34

Figure 22 Control connection location diagram: 800 – 1000 amp Liebert STS2 . . . . . . . . . . . . . . . . . . . . . . 35

Figure 23 Control wiring for remote source selection option. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Figure 24 Control wiring for the programmable relay board option. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Figure 25 Control wiring for the input contact isolator board option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Figure 26 Control wiring for comms board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Figure 27 Control wiring for the Liebert IntelliSlot Web/485 Card with Adapater. . . . . . . . . . . . . . . . . . . . 40

Figure 28 Control wiring for the RS-232 port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Figure 29 Outline drawing for input junction box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Figure 30 Color LCD touch screen display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Figure 31 LED display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Figure 32 Installation drawing, seismic floor stand 100-250A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Figure 33 Installation drawing, seismic floor stand 100-250A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Figure 34 Installation drawing, seismic floor stand 100-250A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Figure 35 Installation drawing, seismic floor stand 100-250A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Figure 36 Installation drawing, seismic floor stand 400-600A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Figure 37 Installation drawing, seismic floor stand 400-600A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Figure 38 Installation drawing, seismic floor stand 400-600A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Figure 39 Installation drawing, seismic floor stand 400-600A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Figure 40 Installation drawing, seismic floor stand 800-1000A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Figure 41 Installation drawing, seismic floor stand 800-1000A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

Figure 42 Installation drawing, seismic floor stand 800-1000A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 43 Installation drawing, seismic floor stand 800-1000A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Figure 44 Liebert STS2 touch screen display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

Figure 45 Liebert STS2 touch screen display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

Figure 46 Source transfer screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

Figure 47 Gate board viewing slot locations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

. . 55

v

Figure 48 Liebert STS2 touch screen display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

Figure 49 Menus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

Figure 50 Keyboard and keypad displays. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

Figure 51 Key lockout switch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

Figure 52 Event mask dialog box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

Figure 53 User settings dialog box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

Figure 54 Source setpoints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

Figure 55 Comm options dialog box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

Figure 56 Modem dialog box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94

Figure 57 Input contact isolator dialog box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96

Figure 58 Programmable relay board dialog box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98

Figure 59 System options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99

Figure 60 Event log . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101

Figure 61 History log . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101

Figure 62 LED display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103

Figure 63 Key lockout switch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105

TABLES

Table 1 Heat output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Table 2 Input/output conduit plate specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Table 3 Input junction box dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Table 4 Input junction box terminal wire size range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Table 5 Remote source selection terminal block. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Table 6 Terminal block 1 and terminal block 2 wire connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Table 7 Programmable relay board pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Table 8 Event messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

Table 9 Terminal commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

Table 10 Value types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

Table 11 Group settings and values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

Table 12 Binary-hexadecimal conversions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

Table 13 Sepoint parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

Table 14 Standard settings for programmable relays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97

Table 15 LED and push button description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104

Table 16 Input/output voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111

Table 17 System current ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111

Table 18 Electrical requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112

Table 19 Unit short circuit withstand capability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112

Table 20 Frame sizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113

Table 21 MTA plug pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115

Table 22 DB9 pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115

Table 23 RS-232 settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116

Table 24 Torque tightening . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138

vi

IMPORTANT SAFETY INSTRUCTIONS

SAVE THESE INSTRUCTIONS

This manual contains important instructions that should be followed during the installation and
maintenance of the Liebert Static Transfer Switch 2 (STS2).

WARNING

!

The unit is supplied by more than one power source. The unit contains hazardous voltages if
any of the input sources are ON, even when the unit is in bypass. To isolate the unit, turn
OFF and lock out ALL input power sources.

Verify that all input power sources are de-energized and locked out before making connections
inside unit.

Lethal voltages exist inside the unit during normal operation. Only qualified service
personnel should perform maintenance on the static switch.

NOTE

Read the entire manual before installing or operating the system. Adhere to all operating
instructions and warnings on the unit and in this manual.

Liebert Corporation neither recommends nor knowingly sells this product for use with life
support or other FDA-designated “critical” devices.

The Static Transfer Switch is suitable for indoor use only. Protect the unit from excessive
moisture and install the unit in an area free from flammable liquids, gases, or corrosive
substances.

The unit is designed to operate from solidly grounded AC power sources only. Provide input
over-current protection in accordance with the unit ratings. Wire and ground the unit
according to national and local electrical safety codes. All wiring should be installed by a
qualified electrician.

Before unit is placed into service for the first time, after equipment relocation, or after the unit
has been de-energized for an extended period of time, a thorough equipment inspection and
supervised start-up by qualified service personnel are strongly recommended.

CAUTION

!

This unit complies with the limits for a Class A digital device, pursuant to Part 15 Subpart J
of the FCC rules. These limits provide reasonable protection against harmful interference in a
commercial environment. This unit generates, uses and radiates radio frequency energy and,
if not installed and used in accordance with this instruction manual, may cause harmful
interference to radio communications. Operation of this unit in a residential area may cause
harmful interference that the user must correct at his own expense.

WARNING

!

Locate the center of gravity symbols and determine the unit’s weight before handling
the cabinet.

1

OVERVIEW OF MANUAL

The Liebert STS2 Installation, Operation and Maintenance Manual is organized in a logical progres­sion so that you can follow the procedures, in the order provided to get your Liebert STS2 installed
and running.

Read the entire manual before proceeding with the unpacking and installation of the Liebert STS2.

The major sections are as follows:

Important Safety Instructions—review the instructions on the previous page before proceeding.

Support Information—a blank table in which you can enter pertinent data, such as the serial and

part numbers, which is needed when calling Liebert support.

Programmable Relay Board Settings Record—a blank table in which you can document your
Programmable Relay Board settings.

Input Contact Isolator Settings Record—a blank table in which you can document your Input
Contact Isolator settings.

1.0 - Safety Precautions—provides safety warnings that you must review before proceeding.

2.0 - Unpacking and Inspections—provides instructions for inspecting, unloading, handling and

removing the Liebert STS2 from the shipping pallet.

3.0 - Location Considerations—provides information regarding environmental considerations for
where the Liebert STS2 is installed.

4.0 - Locating the Liebert STS2—provides instructions for leveling the Liebert STS2 and anchor­ing the unit to the floor, should that be required.

5.0 - Power and Control Wiring—provides instructions wiring the Liebert STS2 for power and con­trol connections.

6.0 - Options—lists the options available for the Liebert STS2.

7.0 - Installation Drawings—provides outline, seismic and electrical field connection drawings

required for installing the Liebert STS2.

8.0 - Introduction to Liebert STS2 Operations—provides a system description.

9.0 - Theory of Operation—provides an overview of how the unit works, plus a brief overview of

some of the components.

10.0 - Operating Instructions for the Touch Screen Interface—provides instructions for turn­ing the system on and off, completing a maintenance by-pass, and selecting a preferred source.

11.0 - Alarm and Faults—provides a list of event messages.

12.0 - Communication Interfaces—discusses the communication ports and provides a list of termi-

nal and modem commands.

13.0 - Liebert STS2 Touch Screen Display—provides instructions for using the HMI touch screen
interface for monitoring and managing the Liebert STS2.

14.0 - Operating the Liebert STS2 LED Display—provides instructions for operating the LED
Display unit without the touch screen display.

15.0 - Specifications—provides specifications for the Liebert STS2.

16.0 - Event Message Help Text—provides the help text for the various system event messages.

This help is also available through the touch screen interface.

17.0 - Maintenance—briefly discusses routine maintenance, provides proper torque settings for nuts
and bolts, and provides the Liebert contact information.

2

1.0 SAFETY PRECAUTIONS

Read this manual thoroughly before working with the static transfer switch.

Be sure to review the warning under Important Safety Instructions on page 1.

Refer to the Handling Considerations on page 5 before attempting to move the unit.

Under typical operation and with the doors closed, only normal safety precautions are necessary. The
area around the static transfer switch should be kept free from puddles of water, excess moisture and
debris. The vent grate in the front of the system should not be obstructed in order to ensure a smooth
air flow through the unit for cooling.

ONLY qualified service personnel should perform maintenance on the static transfer switch. When
performing maintenance on any part of the equipment under power, service personnel and test equip­ment should be located on rubber mats. The service personnel should wear insulating shoes for isola­tion from direct contact with the floor.

Unless all power is removed from the input sources to the unit, one person should never work alone. A
second person should be on hand to assist and summon help, should an accident occur.

Three types of messages are used throughout this manual to stress important text. Carefully read the
information below each Warning, Caution and Note and use professional skills and prudent care
when performing the actions described in that text.

A Warning indicates the presence of a possible serious, life-threatening condition. For example:

Safety Precautions

WARNING

!

The unit is supplied by more than one power source. The Unit contains hazardous voltages if
any of the input sources is ON, even when the unit is in bypass. To isolate the unit, turn OFF
and lock out ALL input power sources.

Verify that all input power sources are de-energized and locked out before making connections
inside unit.

Lethal voltages exist inside the unit during normal operation. only qualified service personnel
should perform maintenance on the static switch.

A Caution indicates a condition that could seriously damage the equipment and possibly injure per­sonnel. For example:

CAUTION

!

Risk of unit damage

The input sources to the static switch must be grounded-wye sources. input sources other
than solidly grounded-wye sources may cause damage to the switch.

A Note emphasizes important text. If the instructions are not properly followed, the equipment could
be damaged or may not properly operate. For example:

NOTE

Read this entire manual before installing and operating the unit.

3

2.0 UNPACKING AND INSPECTIONS

NOTE

Read the entire manual before installing and operating the unit. Upon receipt of the Liebert
Static Transfer Switch2, the installer should perform the following steps to assure a
high-quality installation.

A high-quality installation begins on the receiving dock. The Liebert STS2 and its packaging should
be inspected when the unit is delivered. If the packaging is not damaged, unpack the unit and conduct
an internal inspection before beginning the installation process. This section discusses the inspecting
and unpacking of the Liebert STS2.

2.1 External Inspections

1. While the Liebert STS2 is still on the truck, inspect the equipment and shipping container(s) for
any signs of damage or mishandling. Do not attempt to install the system if damage is apparent.

2. Upon receipt and before unpacking, inspect the shipping crate for damage or mishandling. Check
the Shock-Watch

• If the indicator is red, note on shipper’s receipt and check for concealed damage.

• If any damage as a result of shipping is observed, file a damage claim with the shipper within
24 hours and contact your local Emerson Network Power representative or Liebert Services at
1-800-543-2378 to inform them of the damage claim and the condition of the equipment.

3. Locate the bag containing the keys for the front access door. The bag is attached to the cabinet.

4. Compare the contents of the shipment with the bill of lading. Report any missing items to the
carrier and to Liebert Services immediately.

5. Check the nameplate on the cabinets to verify that the model numbers correspond with the one
specified. Record the model numbers and serial numbers in the front of this installation manual.
A record of this information is necessary should servicing be required.

6. If unit is to be stored before installation, it is recommended to store the unit in a dry environment
with temperatures in the range of -40°F (-40°C) to 176°F (80°C). Use original packing materials or
other suitable means to keep the unit clean. When opening the shipping crate, use care not to
puncture the container with sharp objects.

™

indicator.

Unpacking and Inspections

2.2 Unloading and Handling

CAUTION

!

Risk of unit damage.

When moving the unit by forklift, lift the unit from the rear so as to protect the front panel.

Do not exceed a 15 degree tilt with the forklift.

Also, if you are moving the unit by forklift or pallet jack after it has been removed from the
pallet, be aware of the location of the casters and leveling feet so as not to damage them.

Most Liebert STS2 models are contained in one cabinet. The 800–1000 amp units are contained in two
cabinets that are connected together and shipped on one pallet.

Because the weight distribution in the cabinet is uneven, use extreme care during handling and
transporting.

The unit can be moved by forklift or pallet jack.

See 2.2.2 - Unit Preparation on page 5 for instruction on removing the Liebert STS2 from the pal­let.

4

2.2.1 Handling Considerations

The static switch is bolted to a wooden shipping pallet to allow handling by forklift equipment or a
pallet jack.

Easily Moved — The unit is furnished with integral castors that allow the unit to be rolled into place
after it has reached its location and is removed from the pallet.

WARNING

!

Exercise extreme care when handling static switch cabinets to avoid equipment damage or
injury to personnel.

The cabinet can be safely tilted 15 degrees in any direction by forklift.

If moving the unit up a ramp on its casters or a pallet jack, ensure that the incline does not
exceed fifteen (15) degrees.

Locate the center of gravity symbols and determine the unit’s weight before handling
the cabinet.

Check the unit size and weight — Refer to the cabinet drawings furnished with the unit for size
and weight. Typical cabinet dimensions are shown in Figures 5 through 7. Typical unit weights are:

100-250 amp 780 lb. (354 kg)

400-600 amp 1200 lb. (544 kg)

800-1000 amp 2500 lb. (1134 kg)

Unpacking and Inspections

Plan the route — Review the route over which the unit will be transported to its installation loca­tion to ensure that all passages are large enough to accommodate the unit and support the weight.
Check for any non-negotiable corners or offsets in hallways. Before moving the unit to the intended
location, review 3.0 - Location Considerations.

2.2.2 Unit Preparation

The unit can be removed from the pallet before it is moved to its location.

Complete the following steps to properly remove the Liebert STS2 from the shipping pal­let:

1. Set the pallet in a level area with enough room to maneuver and remove the unit.

2. Remove the bolts holding the unit to the shipping pallet (located in the base of the unit).

3. Remove the shipping blocks from under the frame of the unit.

4. Use a forklift to raise the unit off the pallet and onto the floor. Ensure that the forklift is clear of
the unit’s casters and leveling feet. Lift the unit from the rear.

5. Conduct an internal inspection of the unit. See the list below of inspection items.

2.3 Internal Inspections

After the Liebert STS2 has been unpacked, conduct an internal inspection:

1. Verify that all items have been received.

2. If spare parts were ordered, verify their arrival.

3. After the Liebert Static Transfer Switch2 has been removed from the pallet, open the door and
remove cabinet panels to check for shipping damage to internal components.

4. Check for loose connections or unsecured components in the cabinet(s).

5. Check for any unsafe condition that may be a potential safety hazard.

After the Liebert STS2 has been inspected and no problems are found, the unit can be moved to its
installation location. If using a forklift, remember to lift the unit from the rear.

5

3.0 LOCATION CONSIDERATIONS

The Liebert STS2 should be placed in a clean, cool and dry location. The Liebert STS2 requires only
front access for installation and maintenance. Back or side access is not required. Adequate space is
required above the unit for conduit (if configured as such) and cooling air flow. This section provides
specific information for these considerations.

The unit is designed with top and bottom cable terminations to allow maximum flexibility in its
installation. If bottom cable entry is used, sufficient cable bending space must be provided by a raised
floor or a floor stand.

For dimensions of each unit, see Figures 5, 6 and 7 in section 7.0 - Installation Drawings on
page 18. If your unit is equipped with an optional key lockout switch, see Figures 8 through 10 for
location of that switch.

3.1 Recommended Minimum Service Clearances

The recommended service clearances are at the front of the unit. The minimum service clearance
required by the National Electrical Code (NEC) Article 110-26 is 36 in. (91 cm) for units with voltages
up to 150V to ground and 42 in. (107 cm) for units with voltages over 150V to ground. Clearance of at
least 18 in. (46 cm) is required above the unit for cooling air flow.

3.2 Heat Output

Location Considerations

The unit produces minimal heat during normal operation.

Table 1 Heat output

Switch Size

100 amp 2,711 (0.80)

250 amp 4,680 (1.37)

400 amp 6,972 (2.04)

600 amp 10,520 (3.08)

800 amp 13,777 (4.03)

1000 amp 17,390 (5.09)

Heat Output

BTU/Hr (kW)

3.3 Operating Environment

The unit is designed to be installed indoors where the ambient air temperature is in the range of 32°
and 104°F (0°C and 40°C) with a relative humidity of 0% to 95% non-condensing, up to an altitude of
4000 feet (1200 meters).

6

3.4 Altitude

The standard units are designed for full load operation up to 4000 feet (1200 m) above sea level. See
Figure 1 for recommended deratings for altitudes greater than 4000 feet (1200 m).

Figure 1 Recommended derating for high altitude operation

100

98

96

94

92

Rating (%)

90

88

Location Considerations

86

0

8500

8000

6000

4000

(1372)

(1200)

(1676)

(1524)

5500

5000

4500

6500

(1829)

(1981)

7500

7000

(2286)

(2134)

(2591)

(2438)

Altitude, Feet (M) Above Sea Level

Operation at full load at a higher altitude can be accommodated in ambient temperatures less than
104°F (40°C) ambient. Figure 2 shows the maximum allowable ambient temperature for full load
operation at altitudes above 4000 feet (1200 m).

Figure 2 Maximum ambient temperature for full load operation at higher altitudes

104.0 (40)

102.2 (39)

100.4 (38)

98.6 (37)

96.8 (36)

95.0 (35)

93.2 (34)

94.1 (33)

Maximum Ambient

89.6 (32)

Temperature, °F (°C)

87.8 (31)

86.0 (30)
0

8500

8000

6000

4000

(1200)

(1372)

(1524)

(1676)

5500

5000

4500

(1829)

6500

(1981)

7500

7000

(2134)

(2286)

(2438)

Altitude, Feet (M) Above Sea Level

9000

(2591)

9500

(2743)

9000

(2743)

(3048)

(2896)

10,000

9500

(2896)

(3048)

10,000

7

4.0 LOCATING THE LIEBERT STS2

This section provides instructions for leveling the Liebert STS2 and anchoring the unit to the floor,
should that be required.

For leveling feet details, see Figures 5 through 10.

4.1 Leveling and Anchoring the Unit to the Floor

The Liebert STS2 can be anchored to the concrete floor to ensure stability for the unit in the event of
seismic activity.

The seismic brackets are an option for the Liebert STS2 and are shipped separately from the unit
when ordered.

See Figures 11 through 13 for instructions and details for installing seismic anchoring.

4.2 Leveling of the Static Switch Without Anchoring

The Liebert STS2 is furnished with casters and leveling feet. After final positioning of the unit, adjust
the leveling feet located in each corner of the frame base to level and stabilize the unit.

4.3 Leveling and Anchoring the Static Switch Using Floor Stand

The Liebert STS2 can be installed using the optional floor stand to support the unit instead of using
the raised floor. The Liebert STS2 can be rolled or placed using a lift on to the floor stand.

Locating the Liebert STS2

After final positioning of the unit, adjust the leveling feet located in each corner of the frame base to
level and stabilize the unit.

The floor stand can also be used to ensure the unit’s stability in the event of seismic activity by
anchoring the Liebert STS2 to the floor stand and to the concrete floor.

The seismic floor stand is shipped separately from the unit when ordered.

See Figures 32 through 43 for instructions and details for installing seismic floor stand.

8

5.0 POWER AND CONTROL WIRING

All power and control wiring should be installed by a qualified electrician. All power and control wir­ing must comply with the NEC and applicable local codes. Unless otherwise labeled, use the recom­mended tightening torque as shown in Table 24 - Torque tightening.

The busbars are accessible through the front of the Liebert STS2 and designed to allow one-handed
tightening.

Cables can be installed through the top or bottom of the unit through removable conduits plates.
See Figures 5 through 10 for wiring entrance locations.
Input wiring also can be installed under a raised floor to optional input junction boxes and cables,

when used.

5.1 Input And Output Power Connections

If the unit is furnished with input junction boxes, the input power connections are made to the input
power terminals located in the junction boxes. Input power cables, furnished with the input junction
boxes, are shipped unattached to the unit for connection between the junction boxes and the bus bars
provided inside the unit. Input junction box installation is discussed in 5.2 - Input Junction Box
Installation—Optional on page 10.

If input junction boxes are not furnished, the input power connections are made to the bus bars pro­vided inside the unit. These bus bars are accessible through the front of the unit.

Output power connections also are made to the bus bars provided inside the unit. These bus bars are
accessible through the front of the unit. See Figures 14 to 19 for details on the bus bars.

Power and Control Wiring

WARNING

!

Risk of electric shock
Verify that all input power and control circuits are de-energized and locked out before making

connections inside unit.

The two input power feeds (sources) to the Liebert STS2 should be from two independent sources to
avoid a common source failure.

To ensure proper operation of the Liebert STS2, the two input sources must be the same nominal volt­age level and phase rotation.

For uninterrupted automatic transfer, the two input sources should be synchronized within 15 degrees.

CAUTION

!

Risk of unit damage.
The input sources to the static switch must be grounded-wye sources. Input sources other

than solidly grounded-wye sources may cause damage to the switch.

The Liebert STS2 is designed for operation with 3- or 4-wire, solidly grounded sources only.
For 4-wire operation, the common source neutral must be connected to the Liebert STS2. See

Figure 3 on page 10 for a typical one-line diagram. Refer to Figures 14 to 19 for electrical field con­nections on all units, with both single and dual output breakers.

9

Figure 3 Typical static transfer switch one-line diagram

Power and Control Wiring

CB2

K2

SOURCE 2

K1 K3K2 K3 CB4

CB5

SOURCE 1

CB1

K1

STS2STS1

CB3

OUTPUT

The input and output power wire size should be based on the upstream overcurrent protection device,
observing the NEC and local codes.

The molded case switches contained in the Liebert STS2 are typically non-automatic circuit breakers
that rely on the upstream and/or load overcurrent protection. Upstream overcurrent protection
should be rated equal to or less than the rating of the Liebert STS2 molded case switches.

The Liebert STS2 input and output power and ground and neutral bus bars accommodate a wide
range of wire sizes. The Liebert STS2 bus bars accommodates standard 2 hole lugs.

Table 2 Input/output conduit plate specifications

Rating Max. number and size

100-250A 6 — 3" conduit

400-600A 9 — 4" conduit

800-1000A 12 — 4" conduits

5.2 Input Junction Box Installation—Optional

The input junction box option is available to simplify input connections to the Liebert STS2. Two
input junction boxes and the associated flexible 10 foot long (3 meter) input cables are provided with
this option.

This option is available only with bottom cable entrance, typically when the unit is located on a raised
floor.

If the input junction boxes will be used, they may be shipped either with the unit or in advance to be
installed during the rough-in stage of construction.

Locate the junction boxes a maximum of 8 feet (2.4 meters) from the planned location of the Liebert
Static Transfer Switch.

Due to a lack of clearance for the cables below the unit, the cables are also shipped loose from the unit
for installation at the site. The input cables connect from the input junction boxes to the input power
bus bars inside the Liebert STS2.

The standard configuration for the input junction boxes and cables is for 3-wire-plus-ground feeds. If
the input neutral is required, special 4-wire-plus-ground input cables and junction boxes are required.
See Figure 29 for wiring details.

10

Power and Control Wiring

For preparation purposes, the following tables provide the dimensions and wire sizes for the input
junction boxes.

Table 3 Input junction box dimensions

Length

Switch Rating

100 amp 16 (406) 14 (356) 6 (152)

250 to 600 amp 30 (762) 16 (406) 6 (152)

Inches (mm)

Width

Inches (mm)

Height

Inches (mm)

Table 4 Input junction box terminal wire size range

Switch Rating Power and Ground Lug Wire Range

100 amp #6 to #2/0 AWG

250 to 600 amp (2) #6 AWG to (2) 500 kcmil

11

5.3 System Grounding

Equipment grounding — Grounding is primarily for equipment and personnel safety, although
proper grounding also enhances equipment performance.

All input and output power feeds must include an equipment grounding means as required by the
NEC and local codes.

An insulated equipment ground conductor is recommended to run with each input and output power
feed. The equipment ground conductors should be at least the minimum size conductor per the NEC
based on the upstream overcurrent protection device.

WARNING

!

If conduit is used as a grounding means, adequate electrical continuity must be maintained at
all conduit connections. The use of isolating bushings with a metal conduit can be a safety
hazard and is not recommended.

4-Wire-Plus-Ground Systems — When 4-wire-plus-ground input feeds are utilized, the input power
sources must be properly grounded. Because the neutral is not switched by the Liebert STS2, the neu­trals of the two power sources are solidly interconnected. The NEC prohibits grounding a power
source at more than one point. Connecting the neutrals of two grounded power sources together effec­tively grounds each of the sources at more than one point, which allows neutral current to flow on the
ground system, defeats ground fault protection, creates a safety hazard, and violates the NEC.

Where possible, the two power sources should be located in close proximity and a single
neutral-to-ground bond made (as shown in Figure 4 on page 12 or as is typical with a double­ended substation).

Power and Control Wiring

Figure 4 Typical one-line diagram of two PDUs and a static transfer switch

SOURCE 1

ISOLATION
TRANSFORMER

CB4 CB5

225A225A 225A

CB1

STS1

STS2

CB3

CB2

SOURCE 2

K2K1

K1 K3K2 K3

MICB2MICB1

ISOLATION
TRANSFORMER

225A 225A 225A

5.4 Control Wiring Connections

No control wiring is needed on the standard Liebert STS2. Only certain options require external con­trol wiring. See 6.0 - Options on page 14 for details

12

5.5 Remote Source Selection Wiring

An optional Remote Source Selection board may be installed in your Liebert STS2. This board is
installed in the same bay as the communications options. See Figures 21 and 22 for the location of
these options. See Figure 23 for information on the control wiring for the Remote Source Selection
option.

The Remote Source Selection allows you choose the preferred input source from a remote location.
Terminal connections allow the customer to remotely select a source to be the preferred source in the
same process as the local source transfer selection.

The unit’s preferred source selection and Remote Source Selection are active at the same time, with
the Liebert STS2 following the last request for a preferred source change, regardless of whether it
was from the local or Remote Source Selection controls.

A six pin terminal block provides the Remote Source Selection connections. Two pairs of wires are
used from the switch to trigger the source selection. You can select the type of switch used for this
remote control. Connections are made to four of the connections, using Form A dry contacts. The con­tacts are numbered left to right:

Table 5 Remote source selection terminal block

Contact Connection

1 Source 1

2 Isolated ground

3 Source 2

4 Isolated Ground

5 DO NOT USE

6 DO NOT USE

Power and Control Wiring

See 10.3 - Enabling Remote Source Selection for instructions on enabling the Remote Source
Selection option.

5.6 Power Supply

The Liebert STS2 is supplied with redundant power supplies that are designed to operate from a volt­age range of 200V to 600V. The unit is set at the factory to match the nameplate voltage. Field adjust­ments are not necessary. If the unit needs to operate at a voltage other than what is listed on the
nameplate, contact Liebert Services or your local Emerson Network Power representative. Table 6
provides transformer tap information.

Table 6 Terminal block 1 and terminal block 2 wire connections

Voltage

200 1 9 1 9 1-7

208 1 10 1 10 1-7

220 2 12 2 12 6-8

240 1 11 1 11 1-7

380 1 8 1 8 2-7

400 1 9 1 9 3-7

415 1 10 1 10 4-7

480 1 11 1 11 5-7

600 1 12 1 12 6-7

Connect t Connect

F1

TB1-XX

F2

TB1-YY

TB2-XX

F3

F4

TB2-YY

Jumper

Between

CAUTION

!

Using Table 6, ensure that the wiring for the control transformers matches the input voltage
for the unit.

Improper wiring could result in blown fuses.

13

6.0 OPTIONS

This section discusses the options available for the Liebert STS2. The communications options are
also discussed in 12.0 - Communication Interfaces.

6.1 Programmable Relay Board

The Programmable Relay Board (PRB) provides a means to trigger an external device when an event
occurs in the Liebert STS2. Each PRB has eight channels. Each channel has two sets of Form-C dry
contacts, rated 1 Amp @ 30 VDC or 250 mAmp @ 125VAC.

Any alarm/event can be programmed to any channel or channels. Up to ten (10) events can be pro­grammed to a relay. If multiple events are grouped to one relay, group the events logically to simplify
troubleshooting when an event is triggered. The same alarm/event can be programmed to more than
one channel. Up to two Programmable Relay Boards can be installed in the Liebert STS2 for a total of
16 channels. Programming is performed through the touch screen display.

See Configuring the Programmable Relay Board Settings on page 97 for default settings and
instructions for reconfiguring the relays. See Figures 21 and 22 for the location of the PRB. See
Figure 24 for wiring details. Table 7 provides the PRB pinout.

Table 7 Programmable relay board pinout

Channel Pin No. C N.C. N.O.

CH1

TB1

TB2

TB3

TB4 B1-3 1 2 3

Key: N.O. = Normally Open; N/C. = Normally Closed; C = Common
Note: Pin 16 not used on TB1, TB2, and TB3.

CH2

CH3

CH4

CH5

CH6

CH7

CH8

A1-3 1 2 3

B4-6 4 5 6

A7-9 7 8 9

B 10-12 10 11 12

A 13-15 13 14 15

B1-3 1 2 3

A4-6 4 5 6

B7-9 7 8 9

A 10-12 10 11 12

B 13-15 13 14 15

A1-3 1 2 3

B4-6 4 5 6

A7-9 7 8 9

B 10-12 10 11 12

A 13-15 13 14 15

Options

6.2 Optimized Transfer

When the Liebert STS2 is used as a primary-side switch—on the primary of an isolation trans­former—optimized transfer greatly reduces the transformer magnetization current during automatic
transfers through a new transfer control algorithm. The Liebert algorithm (patent pending) optimizes
the transfer timing so that the volt-seconds applied to the downstream transformer primary is bal­anced, minimizing peak saturation current.

The volt-second balance is achieved by directly computing the volt-second applied to the transformer
during transfer events and determining the optimum time to turn on the alternate source SCRs in
order to balance the volt-second within specified tolerance.

Optimized transfer also seeks to minimize the voltage disturbances while still maintaining trans­former flux balance. This unique flux balance algorithm does not just wait for the balance point to
occur, but will pulse fire the SCRs as soon as possible to minimize the voltage disruption. This results
in far superior voltage waveforms applied to the load.

14

6.3 Distribution Cabinet With I-Line Panelboard—100-600A Units Only

A distribution cabinet with a Square D I-Line panelboard offers space to plug in up to 10 three-pole
branch circuit breakers (100A-250A). The panelboard is rated at 600A with an overall short-circuit
rating of 100,000 AIC.

The full-height cabinet mounts on either the right or left side of the Liebert STS2 and is fully enclosed
with a keylock door and an accent cover that permits access to the panelboard without exposing other
portions of the Liebert STS2.

6.4 Input Contact Isolator Board

The Input Contact Isolator Board (ICI) provides an Liebert STS2 module interface for up to eight
external user alarm or message inputs to be routed through the static transfer switch’s alarm net­work. The eight contacts are normally open dry contacts. When a contact closes, an event is triggered.

The Input Contact Isolator options are configured through the Input Contact Isolator dialog box,
which is accessed from the Comm Option dialog box on the touch screen display. You also can pro­gram the alarm messages through this dialog box. See Configuring the Input Contact Isolator
Settings on page 95 for instructions on configuring the connections.

See Figures 21 and 22 for the location of the ICI. See Figure 25 for wiring details.

6.5 Comms Board

Options

The Comms Board provides a communication interface to Liebert SiteScan™, site monitoring product,
and/or an external modem. Liebert SiteLink
SiteScan

The Comms Board is equipped with an RS-422 communication port for communication to a Liebert
SiteScan monitoring system using a 2-wire twisted pair for reliable communication up to 1000 meters
(3281 feet). Information available from the RS-422 port includes the present switch status informa­tion, all monitoring parameters, and all active alarms.

The Comms Board is equipped with a modem interface for remote reporting of the present switch sta­tus information, alarm history information, and the history of status screens that are triggered upon
a major alarm event. The monitoring system software also supports an auto-dial feature that allows
the system to automatically dial programmed phone numbers by way of the modem to report desig­nated alarm conditions.

Programming the Comms Board is performed through the touch screen display. See Comm
Options on page 93 for details.

See Figures 21 and 22 for the location of the Comms Board.

See Figure 26 for information on the control wiring.

™

to communicate with the Liebert STS2.

™

-12 or Liebert SiteLink™-4 is required for Liebert

6.6 Liebert IntelliSlot® Web/485 Card With Adapter

A Liebert IntelliSlot Web/485 Card With Adapter (IS-WEB485ADPT) enables the Liebert STS2 to
communicate to a network management system (NMS). The card provides the internal hardware and
software to communicate, via SNMP, to any IP-based Ethernet network through an RJ-45 connector
using Category 5 cabling.

The Liebert IS-WEB485ADPT provides redundant paths for communications that make it possible to
connect to a Building Management System (BMS) using Modbus, while simultaneously communicat­ing to a NMS through SNMP. A terminal block provides the connection to Modbus.

See Figures 21 and 22 for the location of the Liebert IS-WEB485ADPT. See Figure 27 control wir­ing information.

If you have questions about the Liebert IS-WEB485ADPT, refer to the user guide, SL-52615, avail­able at Liebert’s Web site, www.liebert.com

15

6.7 LED Display

A light-emitting diode display is available to replace the standard liquid crystal display touch screen
control. The display provides monitoring and control throuh a series of LEDs and buttons. LEDs alert
you when a problem occurs. A PC running terminal emulation software connected to the RS-232 port
is needed to access the data and configuration settings.

6.8 Remote Source Selection

The Remote Source Selection allows the preferred input source to be chosen from a remote location. A
user supplied normally open dry contact allows the user to remotely select a source to be the preferred
source in the same process as the local source transfer selection.

The unit’s preferred source selection and Remote Source Selection are active at the same time, with
the Liebert STS2 following the last request for a preferred source change, regardless of whether it
was from the local or Remote Source Selection controls.

See 10.3 - Enabling Remote Source Selection for instructions on enabling the Remote Source
Selection.

See Figures 21 and 22 for the location of the Remote Source Selection option.

See 5.5 - Remote Source Selection Wiring on page 13 and Figure 23 for information on the con­trol wiring.

6.9 Key Lockout Switch

Options

The key lockout switch activates a software lockout of the touch screen display to prevent manual
transfers and configuration changes. When locked out, the touch screen becomes a read only display.
A key is needed to do manual transfers or change settings.

The alarm silence button is not disabled when in the lockout position.

The switch is located behind the front door but can be operated without opening the front door. See
Figures 8 to 10 for the key lockout location on each unit.

See 14.1.4 - Key Lockout Switch for instructions on using the key lockout switch.

6.10 Redundant Output Breaker

An output plug-in, non-automatic circuit breaker is provided which allows redundancy in the output
power path. The breaker is connected in parallel with the output plug-in non-automatic circuit
breaker.

16

6.11 Input Junction Boxes and Cables

Two input power junction boxes and interconnecting cables provide under floor connection for the two
input power feeds. Power terminal blocks are provided in each junction box for the connection of the
input power conductors and a parity-sized ground conductor. The junction boxes are NEMA 1 enclo­sures. A main input cable assembly is provided for connection between the unit and the junction box.
The cable length between the unit and junction box is 10 feet (3 meters) long.

See 5.2 - Input Junction Box Installation—Optional on page 10 for more information and specifi­cations. See Figure 29 for wiring details.

6.12 Seismic Floor Anchors

Seismic anchors are available for anchoring the unit to a concrete floor to meet seismic Zone 4
requirements. See 4.1 - Leveling and Anchoring the Unit to the Floor on page 8 for more infor­mation. Installation details are provided in Figures 11 through Figure 13 on page 26.

6.13 Seismic Floor Stand

Seismic floor stands in four heights—18", 24", 30" and 36" (457mm, 610mm, 762mm and 914mm)—
are available for the Liebert STS2. The stands can be fastened to the floor to meet seismic Zone 4
requirements. See 4.0 - Locating the Liebert STS2 and Figures 32 through 43 for instructions and
details for installing seismic floor stands.

Options

17

7.0 INSTALLATION DRAWINGS

Figure 5 Outline drawing: 100 – 250 amp Liebert STS2

30"

(762)

Installation Drawings

32.1"
(815)

36.7"
(932)

8.4 (213)

4.6 (116)

21.5 (546)

Center

Of Gravity

18.8

(477)

23.4" (594)

Caster Centers

11. 1

(280)

24.4

(619)

29" (736)

(12mm centers)

21.6"
(548)

Caster

Centers

.47" (12)

centers

77"

(1956)

Center

Of Gravity

19.2"
(488)

24.4"

(620)

9.4 (238)

29.8"
(756)

13.5" (343)

12.8" (326)

5.1

(130)

Notes:

1. All dimensions are in inches and (millimeters).

2. 18" (457mm) min. clearance above unit required for air exhaust.

3. Clearance of 36" (914mm) minimum is required in the front for
installation and service access.

4. Heat output: 2710 btu/hr (0.80 kW/hr) max. for 100A switch.
4680 btu/hr (1.37 kW/hr) max. for 250A switch.

5. Weight: 780 lb. (354 kg)

6. Unit bottom is structurally adequate for forklift handling.

7. Keep cabinet within 15 degrees of vertical while handling.

8. Color - IBM off-white.

9. Open door to replace air filter, disposable type, size 1x25x25.

10.Threaded mounting holes (see detail a) are provided for seismic
anchoring or floor stand. Mounting bolts must be threaded into
the unit mounting holes from underneath the unit base. If floor
stand is used, the casters must rest on the floor stand to support
the weight of the unit.

18

.47" (12) dia.

threaded mounting

hole; 4 typ.

see Note 10

Front of Unit Without Side Panel

2.75"

(69.8) typ.

Leveler

DETAIL A

PS211100
Rev. 03

Figure 6 Outline drawing: 400 – 600 amp Liebert STS2

Installation Drawings

PS211400

Rev. 02

19

Figure 7 Outline drawing: 800 – 1000 amp Liebert STS2

Installation Drawings

PS211800

Rev. 02

20

Figure 8 Outline drawing: 100 – 250amp Liebert STS2 with a key lockout switch option

Installation Drawings

Notes:

1. All dimensions are in inches and (millimeters).

2. 18" (457mm) min. clearance above unit required for air exhaust.

3. Clearance of 36" (914mm) minimum is required in the front for
installation and service access.

4. Heat output: 2710 btu/hr (0.80 kW/hr) max. for 100A switch.
4680 btu/hr (1.37 kW/hr) max. for 250A switch.

5. Weight: 780 lb. (354 kg)

6. Unit bottom is structurally adequate for forklift handling.

7. Keep cabinet within 15 degrees of vertical while handling.

8. Color - IBM off-white.

9. Open door to replace air filter, disposable type, size 1x25x25.

10.Threaded mounting holes (see detail a) are provided for seismic
anchoring or floor stand. Mounting bolts must be threaded into
the unit mounting holes from underneath the unit base. If floor
stand is used, the casters must rest on the floor stand to support
the weight of the unit.

21

PS211101
Rev. 02

Figure 9 Outline drawing: 400 – 600 amp Liebert STS2 with a key lockout switch option

Installation Drawings

PS211401

Rev. 02

22

Installation Drawings

Figure 10 Outline drawing: 800 – 1000 amp Liebert STS2 with the key lockout switch option

PS211801

Rev. 02

23

Figure 11 Seismic anchor drawing: 100 – 250 amp Liebert STS2

FLOOR LINE

FRONT CABINET

BASE BRACKET

FIGURE 3

FRONT FLOOR

BRACKET

OF CABINET

FRONT DOOR

HARDWARE

SUPPLIED

FLOOR ANCHOR

HARDWARE

NOT SUPPLIED

BACK

WALL

APPROX 1/2"

REAR FLOOR

BRACKET

Installation Drawings

PS211105

Rev. 0

BACK WALL

13 . 2 "13 . 2"

(335 MM)

(335 MM)

BRACKET

SEE NOTE (2)

REAR FLOOR

FOR SPACING

REAR CABINET

BASE BRACKET

32.75"

(832 MM)

FLOOR LINE

FRONT

FLOOR ANCHOR

HARDWARE

(NOT SUPPLIED)

FIGURE 2

5.75"

(146 MM)

4.2"

(107 MM)

"
10 . 1

(256 MM)

MM)

4.2"

(107

SIDE WALL

FRONT FLOOR

BRACKET

BRACKETS. UNIT DOOR CAN BE REMOVED FOR BETTER ACCESS.

5. MOVE CABINET INTO POSITION WITH REAR TABS INTO SLOTS OF

FLOOR BRACKET. TABS TO EXTEND AT LEAST 1/2" THROUGH FLOOR

MARK HOLE LOCATIONS AND REMOVE BRACKETS. DRILL AND INSTALL

6.

BRACKET (FIG. 2). THEN ATTACH FRONT FLOOR BRACKETS TO FRONT

CABINET BASE BRACKET BUT DO NOT FULLY TIGHTEN HARDWARE.

FLOOR

REINSTALL FRONT FLOOR BRACKETS TO FRONT CABINET BRACKETS WITH

SUPPLIED HARDWARE AND TORQUE TO 235 LB-IN (26.5 Nm), (FIG. 3).

7. IF SIDE WALLS ARE PRESENT, 5.0 INCH MINIMUM DISTANCE FROM EITHER

SIDE WALL IS REQUIRED.

TOP VIEW

BACK WALL. MARK LOCATION AND DRILL HOLES (FIG. 1) TO

SYSTEM SEISMIC ANCHORING, FIGURE 1

NOTES:

1. RECOMMENDED FLOOR ANCHOR: 1/2" ITW RAMSET/RED HEAD

SELF DRILLING ANCHOR, ICBO #ER-1372 OR EQUIVALENT (NOT

(SUPPLIED). FOLLOW MANUFACTURER'S INSTRUCTIONS.

A MINIMUM DEPTH OF 4.12" INTO THE CONCRETE.

2. POSITION REAR FLOOR BRACKETS ON FLOOR AT LEAST .75"

3. INSTALL REAR CABINET BASE BRACKET (FIG. 2) TO EXISTING

HOLES ON UNDERSIDE OF UNIT WITH TABS FACING BACK WALL.

USE SUPPLIED HARDWARE AND TORQUE TO 365 LB-INCH (41.2 Nm).

NOTE, LOOSEN LEVELING BOLT LOCKING NUT AND TIGHTEN AFTER

FROM

BRACKET IS SECURED.

8. REAR AND FRONT FLOOR BRACKETS, AND REAR AND FRONT CABINET

BASE BRACKETS ARE 1010 STEEL AND APPROX. .25 INCH THICK.

4. INSTALL FRONT CABINET BASE BRACKET (FIG. 3) TO EXISTING

HOLES ON UNDERSIDE OF UNIT WITH BENT FLANGE FACING FRONT.

USE SUPPLIED HARDWARE AND TORQUE TO 365 LB-INCH (41.2 Nm).

NOTE, LOOSEN LEVELING BOLT LOCKING NUT AND TIGHTEN AFTER

BRACKET IS SECURED.

SEE NOTE (7)

FOR SPACING

24

Figure 12 Seismic anchor drawing: 400 – 600 amp Liebert STS2

FLOOR LINE

FRONT CABINET

BASE BRACKET

FIGURE 3

BRACKET

FRONT FLOOR

FRONT DOOR

OF CABINET

SUPPLIED

BACK

WALL

HARDWARE

APPROX 1/2"

NOT SUPPLIED

FLOOR ANCHOR

HARDWARE

REAR FLOOR

BRACKET

Installation Drawings

PS211405

Rev. 0

BACK WALL

13 . 2 "13 . 2 "

(335 MM)(335 MM)

SEE NOTE (2)

REAR FLOOR

BRACKET

FOR SPACING

REAR CABINET

BASE BRACKET

FLOOR LINE

FRONT

FLOOR ANCHOR

HARDWARE

(NOT SUPPLIED)

FIGURE 2

"

5.75

(146 MM)

(107 MM)

(462 MM)

4.2"

18 . 2 "

TOP VIEW

FRONT FLOOR BRACKETS TO FRONT CABINET BRACKETS WITH

5. MOVE CABINET INTO POSITION WITH REAR TABS INTO SLOTS OF

FLOOR BRACKET. TABS TO EXTEND AT LEAST 1/2" THROUGH FLOOR

6. MARK HOLE LOCATIONS AND REMOVE BRACKETS. DRILL AND INSTALL

SUPPLIED HARDWARE AND TORQUE TO 235 LB-IN (26.5 Nm), (FIG. 3).

SIDE WALL IS REQUIRED.

BRACKET (FIG. 2). THEN ATTACH FRONT FLOOR BRACKETS TO FRONT

CABINET BASE BRACKET BUT DO NOT FULLY TIGHTEN HARDWARE.

FLOOR BRACKETS. UNIT DOOR CAN BE REMOVED FOR BETTER ACCESS.

REINSTALL

8. REAR AND FRONT FLOOR BRACKETS, AND REAR AND FRONT CABINET

7. IF SIDE WALLS ARE PRESENT, 5.0 INCH MINIMUM DISTANCE FROM EITHER

BASE BRACKETS ARE 1010 STEEL AND APPROX. .25 INCH THICK.

SEE NOTE (7)

FOR SPACING

4.2"

(107 MM)

SIDE WALL

FRONT FLOOR

32.75"

(832 MM)

BRACKET

SYSTEM SEISMIC ANCHORING, FIGURE 1

NOTES:

1. RECOMMENDED FLOOR ANCHOR: 1/2" ITW RAMSET/RED HEAD

2. POSITION REAR FLOOR BRACKETS ON FLOOR AT LEAST .75"

SELF DRILLING ANCHOR, ICBO #ER-1372 OR EQUIVALENT (NOT

(SUPPLIED). FOLLOW MANUFACTURER'S INSTRUCTIONS.

INSTALL REAR CABINET BASE BRACKET (FIG. 2) TO EXISTING

A MINIMUM DEPTH OF 4.12" INTO THE CONCRETE.

3.

FROM BACK WALL. MARK LOCATION AND DRILL HOLES (FIG. 1) TO

HOLES ON UNDERSIDE OF UNIT WITH TABS FACING BACK WALL.

USE SUPPLIED HARDWARE AND TORQUE TO 365 LB-INCH (41.2 Nm).

NOTE, LOOSEN LEVELING BOLT LOCKING NUT AND TIGHTEN AFTER

BRACKET IS SECURED.

4. INSTALL FRONT CABINET BASE BRACKET (FIG. 3) TO EXISTING

HOLES ON UNDERSIDE OF UNIT WITH BENT FLANGE FACING FRONT.

USE SUPPLIED HARDWARE AND TORQUE TO 365 LB-INCH (41.2 Nm).

NOTE, LOOSEN LEVELING BOLT LOCKING NUT AND TIGHTEN AFTER

BRACKET IS SECURED.

25

Figure 13 Seismic anchor drawing: 800 – 1000 amp Liebert STS2

FLOOR LINE

FRONT CABINET

BASE BRACKET

Installation Drawings

BRACKET

SEE NOTE (2)

REAR FLOOR

FOR SPACING

13.2"15.6"

(335 MM)(396 MM)

BACK WALL

BACK

WALL

APPROX 1/2"

REAR CABINET

BASE BRACKET

BRACKET

REAR FLOOR

FLOOR ANCHOR

HARDWARE

FLOOR LINE

(NOT SUPPLIED )

FIGURE 2

FRONT

FRONT DOOR

OF CABINET

HARDWARE

SUPPLIED

FLOOR ANCHOR

HARDWARE

NOT SUPPLIED

5.7"

(144 MM)

(107 MM)

32.2"

(817 MM)

FIGURE 3

BRACKET

FRONT FLOOR

PS211805

Rev. 0

BRACKETS. UNIT DOOR CAN BE REMOVED FOR BETTER ACCESS.

5. MOVE CABINET INTO P OSITION W ITH REAR TABS INTO S LOTS OF

FLOOR BRACKET. TABS TO EXTEND AT LEAST 1/2" THROUGH FLOOR

MARK HOLE LOCATIONS AND REMOVE BRACKETS. DRILL AND INSTALL

6.

SUPPLIED HARDWARE AND TORQUE TO 235 LB-IN (26.5 Nm), (FIG. 3).

7. I F SIDE WALLS ARE PRESENT, 5.0 INCH MINIMUM D ISTANCE FROM EITHER

SIDE WALL IS REQUIRED.

BRACKET (FIG. 2). THEN ATTACH FRONT FLOOR BRACKETS TO FRONT

CABINET BASE BRACKET BUT DO N OT FULLY T IGHTEN HARDWARE.

FLOOR

REINSTALL FRONT FLOOR BRACKETS TO FRONT CABINET BRACKETS WITH

8. REAR A ND FRONT FLOOR BRACKETS, AND REAR AND FRONT CABINE T

BASE BRACKETS ARE 1010 STEEL AND APPROX. .25 INCH THICK.

13.2"

(335 MM)

13.2"

(335 MM)

)

13.2"

(335 MM

SEE NOTE (7)

FOR SPACING

32.75"

(832 MM)

11. 4 "

(2 89 MM)

12.2"

(310 MM)

SIDE WALL

FRONT FLOOR

BRACKET

(107 MM)

(107 MM)

(107 MM)

4.2" 4.2"
TOP VIEW

4.2"

4.2"

SYSTEM SEISMIC ANCHORING, FIGURE 1

BACK WALL. MARK LOCATION A ND DRILL HOLES (FIG. 1) TO

SELF DRILLING ANCHOR, ICBO #ER-1372 OR EQUIVALENT (NOT

2. POSITION REAR FLOOR BRACKETS ON FLOOR AT LEAST .75"

A MINIMUM DEPTH OF 4.12" INTO THE CONCRETE.

NOTES:

1. RECOMMENDED FLOOR ANCHOR: 1/2" ITW RAMSET/RED HEAD

(SUPPLIED). FOLLOW MANUFACTURER'S INSTRUCTIONS.

FROM

3. INSTALL REAR CABINET BASE BRACKET (FIG. 2) TO EXISTING

HOLES ON UNDERSIDE OF UNIT WITH TABS FACING BACK WALL.

USE SUPPLIED HARDWARE AND TORQUE TO 365 LB-INCH (41.2 Nm).

NOTE, LOOSEN LEVELING BOLT LOCKING NUT AND TIGHTEN AFTER

BRACKET IS SECURED.

4. INSTALL FRONT CABINET BASE BRACKET (FIG. 3) TO EXISTING

HOLES ON U NDERSIDE OF UNIT WITH BENT FLANGE FACING FRONT.

USE SUPPLIED HARDWARE AND TORQUE TO 365 LB-INCH (41.2 Nm).

NOTE, LOOSEN LEVELING BOLT LOCKING NUT AND TIGHTEN AFTER

BRACKET IS SECURED.

26

Installation Drawings

Figure 14 Electrical field connections drawing: 100 – 250 amp Liebert STS2 with single output breaker

CB5

SOURCE 2

K2

CB2

CABLES TO THE BUS BARS.

K1 K3

CB3CB4

SYSTEM OUTPUT

PS212100

Rev. 3

RECOMMENDED.

1. ALL DIMENSIONS ARE IN INCHES AND (MILLIMETERS).

NOTES:

3. CONTROL WIRING AND POWER WIRING MUST BE RUN

2. TOP AND BOTTOM CABLE ENTRY AVAILABLE THROUGH

REMOVABLE ACCESS PLATES. REMOVE, PUNCH TO SUIT

RUN IN A SEPARATE CONDUIT FROM INPUT CABLES.

IN SEPARATE CONDUIT. OUTPUT CABLES SHOULD BE

CONDUIT SIZE, AND REPLACE.

5. ALL WIRING IS TO BE IN ACCORDANCE WITH NATIONAL

4. ALUMINUM AND COPPER CLAD ALUMINUM CABLES ARE

AND LOCAL ELECTRICAL CODES.

NOT

NEUTRAL, AND GROUND CABLE CONNECTIONS. KIT

6. HARDWARE KIT IS SUPPLIED FOR INPUT, OUTPUT,

INCLUDES 1/2" BOLTS, WASHERS, AND NUTS FOR

CONNECTING

7. THE TORQUE REQUIREMENT FOR 1/2"-13 PEM NUTS IS

428 INCH-LBS. (48 N-m).

PEM NUT

NEUTRAL BUS

RIGHT SIDE VIEW

PEM NUT

B, Ø C

SOURCE 1 INPUT

Ø A, Ø

RIGHT SIDE VIEW

INPUT/OUTPUT BUS

SOURCE 1 INPUT Ø A

SOURCE 1 INPUT Ø B

SOURCE 2 INPUT

Ø A, Ø B, Ø C

NEUTRAL BUS

SOURCE 1 INPUT Ø C

CB1

SOURCE 1

CB5

K1

K3K2

CB3

SYSTEM OUTPUT

ONE-LINE DIAGRAM

SIDE VIEW

SECTION A-A

FRONT

Ø A, Ø B, Ø C

.51 DIA.

FRONT VIEW

GROUND BUS

27

CB1 CB2

CB4

NEUTRAL

BUS

GROUND

BUS

FRONT VIEW

(WITH FRONT PANELS REMOVED)

Installation Drawings

Figure 15 Electrical field connections drawing: 100 – 250 amp Liebert STS2 with dual output breakers

PS212101

Rev. 04

28

Installation Drawings

Figure 16 Electrical field connections drawing: 400 – 600 amp Liebert STS2 with single output breaker

CB5

1. ALL DIMENSIONS ARE IN INCHES AND (MILLIMETERS).

NOTES:

3. CONTROL WIRING AND POWER WIRING MUST BE RUN

2. TOP AND BOTTOM CABLE ENTRY AVAILABLE THROUGH

REMOVABLE ACCESS PLATES. REMOVE, PUNCH TO SUIT

RUN IN A SEPARATE CONDUIT FROM INPUT CABLES.

IN SEPARATE CONDUIT. OUTPUT CABLES SHOULD BE

CONDUIT SIZE, AND REPLACE.

ALL WIRING IS TO BE IN ACCORDANCE WITH NATIONAL

NOT RECOMMENDED.

5.

4. ALUMINUM AND COPPER CLAD ALUMINUM CABLES ARE

AND LOCAL ELECTRICAL CODES.

NEUTRAL, AND GROUND CABLE CONNECTIONS. KIT

6. HARDWARE KIT IS SUPPLIED FOR INPUT, OUTPUT,

428 INCH-LBS. (48 N-m).

7. THE TORQUE REQUIREMENT FOR 1/2"-13 PEM NUTS IS

INCLUDES 1/2" BOLTS, WASHERS, AND NUTS FOR

CONNECTING CABLES TO THE BUS BARS.

PEM NUT

RIGHT SIDE VIEW

NEUTRAL BUS

SOURCE 1 INPUT Ø A

SOURCE 1 INPUT Ø B

SOURCE 1 INPUT Ø C

SOURCE 2

SOURCE 1

NEUTRAL BUS

CB1 CB2

K2

K1

K3K1

CB3

CB4

K3K2

PS212400

Rev. 2

SYSTEM OUTPUT

ONE-LINE DIAGRAM

SIDE VIEW

SECTION A-A

PEM NUT

RIGHT SIDE VIEW

INPUT/OUTPUT BUS

.51 DIA.

FRONT VIEW

GROUND BUS

SOURCE 1 INPUT

Ø A, Ø B, Ø C

SOURCE 2 INPUT

CB2

Ø A, Ø B, Ø C

CB1

29

CB4

CB5

SYSTEM OUTPUT

Ø A, Ø B, Ø C

NEUTRAL

BUS

CB3

FRONT

BUS

GROUND

FRONT VIEW

(WITH FRONT PANELS REMOVED)

Installation Drawings

Figure 17 Electrical field connections drawing: 400 – 600 amp Liebert STS2 with dual output breakers

PS212401

Rev. 03

30

Installation Drawings

Figure 18 Electrical field connections drawing: 800 – 1000 amp Liebert STS2 with single output breaker

CB5

CABLES TO THE BUS BARS.

RECOMMENDED.

NOTES:

1. ALL DIMENSIONS ARE IN INCHES AND (MILLIMETERS).

3. CONTROL WIRING AND POWER WIRING MUST BE RUN

2. TOP AND BOTTOM CABLE ENTRY AVAILABLE THROUGH

CONDUIT SIZE, AND REPLACE.

REMOVABLE ACCESS PLATES. REMOVE, PUNCH TO SUIT

NOT

5. ALL WIRING IS TO BE IN ACCORDANCE WITH NATIONAL

4. ALUMINUM AND COPPER CLAD ALUMINUM CABLES ARE

RUN IN A SEPARATE CONDUIT FROM INPUT CABLES.

IN SEPARATE CONDUIT. OUTPUT CABLES SHOULD BE

AND LOCAL ELECTRICAL CODES.

NEUTRAL, AND GROUND CABLE CONNECTIONS. KIT

6. HARDWARE KIT IS SUPPLIED FOR INPUT, OUTPUT,

INCLUDES 1/2" BOLTS, WASHERS, AND NUTS FOR

CONNECTING

7. THE TORQUE REQUIREMENT FOR 1/2"-13 PEM NUTS IS

428 INCH-LBS. (48 N-m).

.51 DIA.

NEUTRAL BUS

RIGHT SIDE VIEW

SOURCE 1

INPUT Ø A

SOURCE 1

INPUT Ø B

SOURCE 1

NEUTRAL

INPUT Ø C

BUS

SOURCE 2

CB2

CB1

SOURCE 1

K3K1

K2

PS212800

Rev. 2

CB3

SYSTEM OUTPUT

K1

CB4

K3K2

ONE-LINE DIAGRAM

SIDE VIEW

SECTION A-A

PEM NUT

SOURCE 2 INPUT

Ø A, Ø B, Ø C

Ø A, Ø B, Ø C

SOURCE 1 INPUT

RIGHT SIDE VIEW

INPUT/OUTPUT BUS

.51 DIA.

FRONT VIEW

GROUND BUS

CB1

CB4

CB2

CB5

BUS

GROUND

C

CB3

Ø A, Ø B, Ø

SYSTEM OUTPUT

FRONT

NEUTRAL

BUS

FRONT VIEW

(WITH FRONT PANELS REMOVED)

31

Installation Drawings

Figure 19 Electrical field connections: 800 – 1000 amp Liebert STS2 with dual output breakers

PS212801

Rev. 03

32

Figure 20 Liebert STS2 non-automatic circuit breaker schedule

Liebert STS2

Ampere

Rating, A Vendor Type Ampacity, A Voltage

100 Square D HL 150

250 Square D JL 250

400 Merlin Gerin NSJ 400

600 Merlin Gerin NSJ 600

800 Square D PJ 800

1000 Square D PJ 1200

1. The Liebert STS2 non-automatic breakers are 3-pole, 600VAC rated with magnetic trip only.

2. Upstream devices (by others) must be used to provide overcurrent protection. Upstream overcurrent protection should
have ampacity equal to or less than the ampere rating of the static switch.

200-240V
380-480V

600V

200-240V
380-480V

600V

200-240V
380-480V

600V

200-240V
380-480V

600V

200-240V
380-480V

600V

200-240V
380-480V

600V

Installation Drawings

Withstand

Current

125K
100K

50K

125K
100K

50K

100K
100K

25K

100K
100K

25K

100K

65K
25K

100K

65K
25K

33

Figure 21 Control connection location diagram: 100 – 600 amp Liebert STS2

PROGRAMMABLE RELAY

BOARD (OPTION) SEE NOTE 2

NOTES :

1. TYPICAL OPTIONS ARE SHOWN.

2. MAXIMUM OF TWO (2) PROGRAMMABLE

RELAY BOARDS CAN BE USED.

REMOTE SOURCE

SELECT (OPTION)

BOARD (OPTION) SEE NOTE 2

PROGRAMMABLE RELAY

INPUT CONTACT ISOLATOR BOARD

(OPTION) OR PROGRAMMABLE RELAY

BOARD (OPTION) SEE NOTE 2

Installation Drawings

PS213000

Liebert IS-WEB/485 Card (Option)

COMMS BOARD FOR LIEBERT

SITESCAN, EXTERNAL MODEM

INTERFACE OPTION

Rev. 2

SEE OPTION

LOCATION DETAIL

OPTION LOCATION DETAIL

CONTROL WIRING

FRONT VIEW WITH FRONT D OOR R EMOVED

34

Figure 22 Control connection location diagram: 800 – 1000 amp Liebert STS2

BOARD (OPTION) SEE NOTE 2

PROGRAMMABLE RELAY

BOARD (OPTION) SEE NOTE 2

NOTES :

RELAY BOARDS CAN BE USED.

2. MAXIMUM OF TWO (2) PROGRAMMABLE

1. TYPICAL OPTIONS ARE SHOWN.

SELECT (OPTION)

REMOTE SOURCE

PROGRAMMABLE RELAY

INPUT CONTACT ISOLATOR BOARD

(OPTION) OR PROGRAMMABLE RELAY

BOARD (OPTION) SEE NOTE 2

Installation Drawings

PS213800

COMMS BOARD FOR LIEBERT

SITESCAN, EXTERNAL MODEM

Liebert IS-WEB/485 Card (Option)

INTERFACE (OPTION)

Rev. 1

OPTION LOCATION DETAIL

CONTROL WIRING

FRONT VIEW WITH FRONT D OOR R EMOVE D

35

SEE OPTION

LOCATION DETAIL

Figure 23 Control wiring for remote source selection option

See Note 1

Installation Drawings

Source 1

Preferred

Source 2

Preferred

S2S1 GN D GND

1 2 3 4 65

TB50

Remote Source Selection

NOTES

1. Customer-provided normally open dry contacts. Rating 10mA at 30VDC.

2. Maximum cable length 500 ft. (152m) with #16 AWG, 300V minimum
flexible stranded cable.

3. All control wiring (by others) must be run separate from power wiring .
Control wiring runs should not be combined in the same conduit.

4. Refer to Static Transfer Switch control diagram for location of remote source
selection opt.

5. All wiring must be in accordance with national and local electrical codes.

PS213007
Rev. 02

36

Figure 24 Control wiring for the programmable relay board option

Installation Drawings

PS213001

Rev. 2

(C=COMMON, NC=NORMALLY CLOSED, NO=NORMALLY OPENED)

SIGNAL CHANNELS WITH (2) FORM-C DRY CONTACTS PER

2. PROGRAMMABLE RELAY BOARD OPTION INCLUDES 8

TERMINAL BLOCKS 1 THROUGH 15.

1. CUSTOMER CONTROL WIRING CONNECTION POINTS ARE

NOTES:

J71

10 11 12 13 14 15 16

213457689

2134576 8 9 10 11121314 1516

3. REFER TO INSTALLATION, OPERATION & MAINTENANCE

CHANNEL. SEE TABLE.

MANUAL FOR CONFIGURING THE PROGRAMMABLE RELAY

J72

10 11 12 13 14 15 16

213457689

SEPARATE FROM POWER WIRING. CONTROL WIRING RUNS

4. ALL CONTROL WIRING (BY OTHERS) MUST BE RUN

BOARD OPTION.

SHOULD NOT BE COMBINED IN THE SAME CONDUIT.

J73

6. CONTACT RATINGS: 1AMP @ 30VDC, 200mA @125VAC.

DIAGRAM FOR LOCATION OF PROGRAM RELAY BOARD OPTION.

5. REFER TO STATIC TRANSFER SWITCH CONTROL CONNECTION

TABLE

8. ALL WIRING MUST BE IN ACCORDANCE WITH NATIONAL

#16AWG FLEXIBLE STRANDED CABLE.

7. MAXIMUM CABLE LENGTH 500 FT. (152 METERS) WITH

AND LOCAL ELECTRICAL CODES.

3

NO

NC

C

9126

2

5

8

1

7104

4 - 6

7 - 9

1 - 3

PIN NO.CHANNEL

A

A

B

11

10 - 12

B

693

15

258

14

471

1313 - 15

4 - 6

1 - 3

A

A

B

7 - 9

B

12

15

11

14

10

13

13 - 15

10 - 12

A

B

3

2

1

1 - 3

A

6

5

4

4 - 6

B

9

8

7

7 - 9

A

3

15

12

2

11

14

1

13

10

1 - 3

13 - 15

10 - 12

A

B

B

213

J74

CH5

CH4

CH3

CH2

CH1

PROGRAMMABLE RELAY BOARD

J71

37

J72

CH6

CH7

J73

CH8

NOTE: PIN 16 NOT USED ON J71, J72, & J73

J74

Figure 25 Control wiring for the input contact isolator board option

“NO CUSTOMER CONNECTION”

1162345 7896151413121110

Installation Drawings

J51

Table J51

Input

Contact Pin No.

1

2

3

4

5

6

7

8

10

11

12

13

14

15

16

INPUT CONTACT ISOLATOR BOARD

02-810012-XX

PS213002
Rev. 02

NOTES:

1. Customer control wiring connection points are Terminals 1 through 16
(see Table J51).

2. Customer-provided, normally open, dry contacts for user alarm messages.

1

2

3

4

5

6

7

8

9

3. Refer to installation, operation AND maintenance manual for configuring the
input contact isolator board option.

4. All control wiring (by others) must be run separate from power wiring. Control
wiring runs should not be combined in the same conduit.

5. Refer to static transfer switch control connection diagram for location of input
contact isolator board option.

6. Signal voltage: 100mA @ 12VDC.

7. Maximum cable length 500 ft. (152 meters) with #16 AWG flexible, stranded cable.

8. All wiring must be in accordance with national and local electrical codes.

38

Figure 26 Control wiring for comms board

EXTERNAL MODEM

SEE DETAIL A

TB55 TB56TB51

Installation Drawings

J81

J1A

“NO CUSTOMER

CONNECTION”

LIEBERT

SITESCAN

SEE DETAIL B

CUSTOMER-SUPPLIED

INTERCONNECTING CABLE

TO EXTERNAL MODEM

SEE NOTE 2

DCD

RXTXDTR

DSR

GND

RI

RTS

CTS

91 2 3 4 5 6 7 8

J81

DETAIL A

“NO CUSTOMER

CONNECTION”

COMMS BOARD

02-810015-XX

CUSTOMER-SUPPLIED

INTERCONNECTING CABLE

TO LIEBERT SITESCAN

SEE NOTES 1 & 2

1 2 3

TB 55

DETAIL B

PS213003
Rev. 02

NOTES

1. Maximum cable length 1000 feet (300 meters) with
twisted pair cable #22 AWG 300V minimum.

2. Signal voltage 5VDC, current 10mA.

3. Refer to installation, operation and maintenance
manual for configuring the COMMS board.

4. All control wiring (by others) must be run separate from
power wiring. Control wiring runs should not be
combined in the same conduit.

5. Refer to control connection location diagram of static
transfer switch for location of COMMS board.

6. All wiring must be in accordance with national and
local electrical codes.

39

Figure 27 Control wiring for the Liebert IntelliSlot Web/485 Card with Adapater

Customer-Supplied

Interconnection Cable

Ethernet Network

RF-45 Connector

Notes:

1. Wire size and type: 10/100 base-T ethernet

cable with RJ-45 plug connector. The length is

limited by internet standards.

2. Maximum cable length 1000 feet (300 meters)

with twisted pair cable #22 AWG minimum. Signal

voltage 5VDC, current 10mA.

3. Refer to the Liebert Intellislot Web/485 Card’s

installation, operation & maintenance manual for

configuration details.

4. All control wiring (by others) must be run

separate from power wiring. Control wiring runs

should not be combined in the same conduit.

5. Refer to control connection location diagram

of static transfer switch for location of Liebert

Intellislot Web/485 card option.

6. All wiring must be in accordance with national

and local electrical codes.

See Notes 1 and 2

Installation Drawings

PS213008

Rev. 01

­+

See Note 2

Customer-supplied

interconnection cable

to Modbus

No customer

connection

23
1

TB3

TB3

J3

TB2

DB-9

TB1

No customer

connection

40

RS-232 (DB-9 connector)

for setup only. Uses standard

computer serial port cable

Figure 28 Control wiring for the RS-232 port

See Detail A

Installation Drawings

NOTES

1. RS-232 communication through
DB9 connector .

LCD D I SPL AY

Front View

Upper Half of Unit

With Door Open

2. Connector accessible with front
door open . Connector must be
removed before closing door .

6 7 8 9

12345

TXD RXD GND

DB9 Connector

Detail A

PS213006
Rev. 01

41

Figure 29 Outline drawing for input junction box

Installation Drawings

Recommended Location for

Customer Connection of Input

Power Raceway (by others)

3-Phase, 3-Wire Plus Ground

B

H

Power Terminal Block

A

B

C

G

INPUT JUNCTION BOX

G
Diam eter hol e

Location of

Factory-Supplied

Input Power

Cable Assembly

E

D

A

C

PS211005
Rev. 0

NOTES:

1. Two junction boxes are supplied, one for each input.

2. Cable(s) are factory-supplied to connect the junction
box to the input busbars. See electrical field
connections drawing for location.

3. Parallel cables are used on 400A and 600A units.

Input Junction Box

Dimensional Data - Inches (mm)

Rating

100A 16 (406) 14 (356) 6 (152) 17-1/2 (445) 12 (305) 16-3/4 (426) 5/16 (8) 1 (25) #6 AWG to #2/0 AWG

250A - 600A 16 (406) 30 (762) 6 (152) 33 (830) 10 (254) 32 (813) 7/16 (11) 3 (76)

Wire Size RangeABC D E F GH

(2) #6 AWG to (2)

500 kcmil

42

Figure 30 Color LCD touch screen display

LOA D

DISPLAY

Installation Drawings

MENU

PANEL

OPTIONS

PS211000

Rev. 0

CB 4

SO URC E 1

A-B B- C C-A

2 08 V 20 8V 20 8V

2 00 A 20 0A 20 0A

CB 1

CB3

LOAD

XFE RS

KW

OUTPU T

60.0 HZ

0

70

80%

70 KVA

SOURCE 2

A-B B-C C-A

CB5

SOURCE 2SOURCE 1

0-30 +30

SO URC E 1 L EADS SOUR CE 2 BY 3.5 D EGR EE S

0.0 H Z

0A 0A 0A

19 5V 19 5V 195 V

CB2

LOG SCONFIG SO URC E XFERS STARTUP PROC. BYP . P RO C. HEL P LOGO

PREFERRED

MIMIC

ALTE RN ATE

RESET SIL ENCE

SI SCR SHORT

S2 SCR SHORT

S1 SCR OPEN

S2 SCR OPEN

HEATSINK OVERTEMP

EQUIPMENT OVERTEMP

AMBIENT OVERTEMP

EVENT

ALARM

CONTROLS

DISPLAY

43

Figure 31 LED display

Installation Drawings

(A)

(B)

(E)

1

2

(C)

1

2

(D)

(F)

(L)

(H)

(G)

3A

4

3

5

(J)

!

(K) (M)

Symbol LED Description

(N)

PS211002
Rev. 0

LED DISPLAY LEGEND

A Green Source 1 Power is Present

B Green Source 2 Power is Present

C Green Source 1 Within Tolerance

D Green Source 2 Within Tolerance

E Green Source 1 SCRs is On

F Green Source 2 SCRs is On

G Yellow Source Transfer Inhibited

H Green Push Button to Select Source 1 as the Preferred Source

I Green Push Button to Select Source 2 as the Preferred Source

J Green Output Power is Present

K Alarm Silence Button

L

M Alarm Reset Push Button

N Red Alarm Present

1 Green CB1 Closed

2 Green CB2 Closed

3 Green CB3 Closed

3A Green CB3A Closed

4 Yellow CB4 Closed

5 Yellow CB5 Closed

Symbol to Indicate the K and M Must Be pushed at the
Same Time to Reset Alarm

44

Figure 32 Installation drawing, seismic floor stand 100-250A

HEIGHT HEIGHT MAX: HEIGHT MIN:

HEIGHT TABLE

1.0" NUT 320 FT - LBS

M8 - 1.25 16FT - LBS

M10 - 1.5 31 FT - LBS

M12 - 1.75 53 FT -LBS

HARDWARE TORQUE CHART

STAND:

523401G1 18.0" 19.25" 16.75"

523402G1 24.0" 25.25" 22.75"

P/N OF FLOOR

Installation Drawings

523403G1 30.0" 31.25" 28.75"

523404G1 36.0" 37.25" 34.75"

PS215000 REV. NO. 0

(FEILD SUPPLIED) (2) PER FOOT.

THE FLOOR. ATTACH FLOOR STAND FEET USING 1/2" X 4" RED HEAD TRUBOLTS

IN (FOOT DETAIL A & B; ON DWG PS215000). FLOOR STAND MUST BE LEVEL AND ALL FEET

SLOTS ON THE (REAR LOWER STS2 BRACKET). TABS TO EXTEND AT LEAST 1/2" THROUGH

2. INSTALL REAR LOWER STS2 BRACKET TO THE FLOOR STAND USING EXISTING HOLES WITH BENT FLANGE

FACING THE FRONT OF THE FLOOR STAND (FIG. 3 AND FIG 4, DWG PS215001). USE M12-1.75X40mm CAP SCREW,

SPLIT LOCK WASHER, AND FLAT WASHER AND TORQUE TO 53 FT-LBS.

3. LOOSEN THE STS2 ADJUSTABLE LEVELER FEET NUTS (SEE DETAIL C; DWG PS215001). INSTALL REAR

UPPER STS2 BRACKET USING EXISTING HOLES ON UNDERSIDE OF THE STS2 WITH TABS FACING OUT

(FIG 1 AND FIG 2, PS215001). INSTALL FRONT UPPER STS2 BRACKET USING EXISTING HOLES ON UNDERSIDE

OF THE STS2 WITH BENT FLANGE FACING TO THE FRONT. (FIG.1 AND FIG 2, PS215001). USE M12-1.75X40mm CAP

SCREW, SPLIT LOCK WASHER, AND FLAT WASHER AND TORQUE TO 53 FT-LBS. RETIGHTEN LEVELER FEET NUTS.

4. FLOOR STAND CAN BE MOUNTED NEXT TO A WALL IF NEEDED, REAR ACCESS NOT REQUIRED.

INSTALL FLOOR STAND WITH FEET ORIENTATED AS SHOWN IN (BOTTOM VIEW; DWG PS215000).

TO ADJUST VERTICAL HEIGHT OF FLOOR STAND FEET, LOOSEN, ADJUST AND TIGHTEN THE NUTS AND

JAM NUT SHOWN

MUST BE TOUCHING

EXPANSION ANCHORS

5. ROLL THE STS2 ONTO THE FLOOR STAND SO THAT THE TABS ON THE (REAR UPPER STS2 BRACKET)

INSTALLATION NOTES:

1. CHECK ALL HARDWARE FOR PROPER TORQUE PRIOR TO INSTALLATION.

NUT

JAM NUT

FIT INTO THE

NUT

FOOT DETAIL A

TO FLOOR STAND USING M12-1.75X40mm CAP SCREW, SPLIT LOCK WASHER, AND

CAP SCREW, SPLIT LOCK WASHER, AND FLAT WASHER AND TORQUE TO 31 FT-LBS.

BRACKET (FIG. 2, DWG PS215002).

OWER FRONT BRACKETS (FIG 1, DETAIL A; DWG PS215002). ATTACH BRACKET TO STS2 USING

AND TORQUE TO 53 FT-LBS

FLOOR STAND

6. INSTALL THE L

M10-1.50X30mm

ATTACH BRACKET

FLAT WASHER

FOOT DETAIL B

2.47"

B

ISOMETRIC VIEW 250A FLOOR STAND

100-250A STS2

SEISMIC FLOOR STAND

INSTALLATION DRAWING FOR

MOUNTING PLATE

ALIGN FOOT PARALLEL TO

MOUNTING PLATE AS SHOWN

TYP

29.9"

36.9"

TOP VIEW

TABLE

SEE HEIGHT

FRONT VIEW

A

45

TYP.

17.48"

TYP.

.625" DIA x 2

2.47"

TYP.

TYP.

29.44"

BOTTOM VIEW

6" TYP.

Figure 33 Installation drawing, seismic floor stand 100-250A

REAR UPPER

STS2 BRACKET

REARFRONT

Installation Drawings

SEE DWGS PS215000, PS215002, AND PS215003

NOTE:

FOR DETAILS.

FRONT UPPER

STS2 BRACKET

REAR LOWER

BRACKET

LEVELER FOOT NUT

LEVELER FOOT

FIG. 2

DETAIL C

RIGHT SIDE VIEW OF STS2 WITH UPPER BRACKETS

REAR

PS215001 Rev. 0

FIG. 4

RIGHT SIDE VIEW OF FLOOR STAND

WITH LOWER REAR MOUNTING BRACKET

FRONT

(2 PLACES)

CAP SCREW M12-1.75X40MM

SPLIT LOCK WASHER M12

FLAT WASHER M12 (SEE DETAIL C)

FRONT UPPER STS2 BRACKET

FRONT

(2 PLACES)

CAP SCREW M12-1.75X40MM SPLIT

LOCK WASHER M12 FLAT WASHER M12

REAR UPPER STS2 BRACKETREAR SIDE

FIG. 1

BOTTOM VIEW OF STS2 WITH UPPER BRACKETS

46

REAR LOWER STS2 BRACKETREAR

(3 PLACES)

CAP SCREW M12-1.75 x40mm

SPLIT LOCK WASHER M12

FLAT WASHER M12

100-250A STS2

INSTALLATION DRAWING

FOR SEISMIC FLOOR STAND

FIG. 3

TOP VIEW OF FLOOR STAND

FRONT

WITH LOWER REAR MOUNTING BRACKET

Figure 34 Installation drawing, seismic floor stand 100-250A

SEE DWGS PS215000, PS215001, AND PS215003

NOTE:

FOR DETAILS.

REAR UPPER STS2 BRACKET

REAR LOWER STS2 BRACKET

UPPER REAR BRACKET TABS TO

SLIDE INTO LOWER REAR

BRACKET SLOTS

(2 PLACES)

Installation Drawings

(2 PLACES)

CAP SCREW M12-1.75X40MM

SPLIT LOCK WASHER M12

CAP SCREW M10-1.5X30MM SPLIT

LOCK WASHER M10 FLAT WASHER M10

FLAT WASHER M12

PS215002 Rev. 0.

LOWER FRONT BRACKET

FIG. 2

2 PLACES

DETAIL A

REAR RIGHT ISOMETRIC VIEW

A

FIG. 1

FIG. 3

RIGHT SIDE VIEW

FRONT LEFT ISOMETRIC VIEW

47

Figure 35 Installation drawing, seismic floor stand 100-250A

NOTE:

SEE DWGS PS215000, PS215001, AND PS215002

FOR DETAILS.

32.1"

Installation Drawings

PS215003 Rev. 0

RAISED FLOOR

RIGHT SIDE VIEW

ISOMETRIC VIEW

30.0"

FRONT VIEW

77.0"

48

Figure 36 Installation drawing, seismic floor stand 400-600A

Installation Drawings

PS216000 Rev.0

2. INSTALL REAR LOWER STS2 BRACKET TO THE FLOOR STAND USING EXISTING HOLES WITH BENT FLANGE

FACING THE FRONT OF THE FLOOR STAND (FIG. 3 AND FIG 4, DWG PS216001). USE M12-1.75X40mm CAP SCREW,

SPLIT LOCK WASHER, AND FLAT WASHER AND TORQUE TO 53 FT-LBS.

3. LOOSEN THE STS2 ADJUSTABLE LEVELER FEET NUTS (SEE DETAIL C; DWG PS216001). INSTALL REAR

UPPER STS2 BRACKET USING EXISTING HOLES ON UNDERSIDE OF THE STS2 WITH TABS FACING OUT

(FIG 1 AND FIG 2, PS216001). INSTALL FRONT UPPER STS2 BRACKET USING EXISTING HOLES ON UNDERSIDE

OF THE STS2 WITH BENT FLANGE FACING TO THE FRONT. (FIG.1 AND FIG 2, PS216001). USE M12-1.75X40mm CAP

SCREW, SPLIT LOCK WASHER, AND FLAT WASHER AND TORQUE TO 53 FT-LBS. RETIGHTEN LEVELER FEET NUTS.

4. FLOOR STAND CAN BE MOUNTED NEXT TO A WALL IF NEEDED, REAR ACCESS NOT REQUIRED.

INSTALL FLOOR STAND WITH FEET ORIENTATED AS SHOWN IN (BOTTOM VIEW; DWG PS216000).

TO ADJUST VERTICAL HEIGHT OF FLOOR STAND FEET, LOOSEN, ADJUST AND TIGHTEN THE NUTS AND

JAM NUT SHOWN IN (FOOT DETAIL A & B; ON DWG PS216000). FLOOR STAND MUST BE LEVEL AND ALL FEET

MUST BE TOUCHING THE FLOOR. ATTACH FLOOR STAND FEET USING 1/2" X 4" RED HEAD TRUBOLTS

EXPANSION ANCHORS (FEILD SUPPLIED) (2) PER FOOT.

5. ROLL THE STS2 ONTO THE FLOOR STAND SO THAT THE TABS ON THE (REAR UPPER STS2 BRACKET)

FIT INTO THE SLOTS ON THE (REAR LOWER STS2 BRACKET). TABS TO EXTEND AT LEAST 1/2" THROUGH

FLOOR STAND BRACKET (FIG. 2, DWG PS216002).

6. INSTALL THE LOWER FRONT BRACKETS (FIG 1, DETAIL A; DWG PS216002). ATTACH BRACKET TO STS2 USING

M10-1.50X30mm CAP SCREW, SPLIT LOCK WASHER, AND FLAT WASHER AND TORQUE TO 31 FT-LBS.

ATTACH BRACKET TO FLOOR STAND USING M12-1.75X40mm CAP SCREW, SPLIT LOCK WASHER, AND

INSTALLATION NOTES:

1. CHECK ALL HARDWARE FOR PROPER TORQUE PRIOR TO INSTALLATION.

NUT

JAM NUT

NUT

FLAT WASHER AND TORQUE TO 53 FT-LBS

B

1.0" NUT 320 FT - LBS

M8 - 1.25 16FT - LBS

M10 - 1.5 31 FT - LBS

M12 - 1.75 53 FT -LBS

HEIGHT TABLE

HARDWARE TORQUE CHART

523405G1 18.0" 19.25" 16.75"

523406G1 24.0" 25.25" 22.75"

P/N OF FLOOR STAND: HEIGHT HEIGHT MAX: HEIGHT MIN:

523407G1 30.0" 31.25" 28.75"

523408G1 36.0" 37.25" 374.75"

ISOMETRIC VIEW #1

FRONT SIDE

38"

36.9"

FOOT DETAIL A

TOP VIEW

FOOT DETAIL B

SEE

TABLE

HEIGHT

49

TYP

2.47"

TYP.

25.59"

FRONT VIEW

A

TYP.

.625" DIA x 2

2.47"

TYP

TYP.

29.44"

B

MOUNTING PLATE

ALIGN FOOT PARALLEL TO

MOUNTING PLATE AS SHOWN

6" TYP.

BOTTOM VIEW

Figure 37 Installation drawing, seismic floor stand 400-600A

REAR UPPER

STS2 BRACKET

REARFRONT

BRACKET

REAR

REAR LOWER

Installation Drawings

SEE DWGS PS216000, PS216002, AND PS216003

NOTE:

FOR DETAILS.

FRONT UPPER

STS2 BRACKET

LEVELER FOOT NUT

LEVELER FOOT

FIG. 2

DETAIL C

RIGHT SIDE VIEW OF STS2 WITH UPPER BRACKETS

PS216001 Rev. 0

FIG. 4

RIGHT SIDE VIEW OF FLOOR STAND

WITH LOWER REAR MOUNTING BRACKET

FRONT

(2 PLACES)

CAP SCREW M12-1.75X40MM

SPLIT LOCK WASHER M12

FLAT WASHER M12 (SEE DETAIL C)

FRONT UPPER STS2 BRACKET

FRONT

CAP SCREW M12-1.75X40MM SPLIT

(2 PLACES)

LOCK WASHER M12 FLAT WASHER M12

REAR UPPER STS2 BRACKETREAR SIDE

FIG. 1

BOTTOM VIEW OF STS2 WITH UPPER BRACKETS

50

REAR LOWER STS2 BRACKETREAR

(3 PLACES)

CAP SCREW M12-1.75 x40mm

SPLIT LOCK WASHER M12

FLAT WASHER M12

FIG. 3

TOP VIEW OF FLOOR STAND

WITH LOWER REAR MOUNTING BRACKET

FRONT

Figure 38 Installation drawing, seismic floor stand 400-600A

SEE DWGS PS216000, PS216001, AND PS216003

NOTE:

FOR DETAILS.

REAR UPPER STS2 BRACKET

REAR LOWER STS2 BRACKET

UPPER REAR BRACKET TABS TO

SLIDE INTO LOWER REAR

BRACKET SLOTS

Installation Drawings

PS216002 Rev. 0

(2 PLACES)

CAP SCREW M10-1.5X30MM SPLIT

LOCK WASHER M10 FLAT WASHER M10

FIG. 2

REAR RIGHT ISOMETRIC VIEW

A

(2 PLACES)

CAP SCREW M12-1.75X40MM

SPLIT LOCK WASHER M12

FLAT WASHER M12

LOWER FRONT BRACKET

DETAIL A

2 PLACES

FIG. 1

FRONT LEFT ISOMETRIC VIEW

51

FIG. 3

RIGHT SIDE VIEW

Figure 39 Installation drawing, seismic floor stand 400-600A

NOTE:

SEE DWGS PS216000, PS216001, AND PS216002

FOR DETAILS.

32.1"

Installation Drawings

PS216003 Rev. 0

RAISED FLOOR

RIGHT SIDE VIEW

ISOMETRIC VIEW

38"

FRONT VIEW

77.0"

52

Figure 40 Installation drawing, seismic floor stand 800-1000A

Installation Drawings

JAM NUT SHOWN IN (FOOT DETAIL A & B; ON DWG PS217000). FLOOR STAND MUST BE LEVEL

ALL FEET MUST BE TOUCHING THE FLOOR. ATTACH FLOOR STAND FEET USING 1/2" X 4" RED HEAD

BOLTS EXPANSION ANCHORS (FEILD SUPPLIED) (2) PER FOOT.

INSTALLATION NOTES:

1. CHECK ALL HARDWARE FOR PROPER TORQUE PRIOR TO INSTALLATION.

2. INSTALL REAR LOWER STS2 BRACKET TO THE FLOOR STAND USING EXISTING HOLES WITH

BENT FLANGE FACING THE FRONT OF THE FLOOR STAND (FIG. 3 AND FIG 4, DWG PS217001).

USE M12-1.75X40mm CAP SCREW, SPLIT LOCK WASHER, AND FLAT WASHER AND TORQUE TO 53 FT-LBS.

3. LOOSEN THE STS2 ADJUSTABLE LEVELER FEET NUTS (SEE DETAIL C; DWG PS217001). INSTALL REAR

UPPER STS2 BRACKET USING EXISTING HOLES ON UNDERSIDE OF THE STS2 WITH TABS FACING OUT

(FIG 1 AND FIG 2, PS217001). INSTALL FRONT UPPER STS2 BRACKET USING EXISTING HOLES ON

UNDERSIDE OF THE STS2 WITH BENT FLANGE FACING TO THE FRONT. (FIG.1 AND FIG 2, PS217001).

USE M12-1.75X40mm CAP SCREW, SPLIT LOCK WASHER, AND FLAT WASHER AND TORQUE TO

53 FT-LBS. RETIGHTEN LEVELER FEET NUTS.

4. FLOOR STAND CAN BE MOUNTED NEXT TO A WALL IF NEEDED, REAR ACCESS NOT REQUIRED.

INSTALL FLOOR STAND WITH FEET ORIENTATED AS SHOWN IN (BOTTOM VIEW; DWG PS217000).

TO ADJUST VERTICAL HEIGHT OF FLOOR STAND FEET, LOOSEN, ADJUST AND TIGHTEN THE NUTS

AND

AND

TRU

STAND BRACKET (FIG. 2, DWG PS217002).

INTO THE SLOTS ON THE (REAR LOWER STS2 BRACKET). TABS TO EXTEND AT LEAST 1/2" THROUGH

5. ROLL THE STS2 ONTO THE FLOOR STAND SO THAT THE TABS ON THE (REAR UPPER STS2 BRACKET)

FIT

FLOOR

FOOT DETAIL A

NUT

JAM NUT

NUT

ISOMETRIC VIEW

PS217000 Rev. 0

B

ATTACH BRACKET TO FLOOR STAND USING M12-1.75X40mm CAP SCREW, SPLIT LOCK WASHER,

THE LOWER FRONT BRACKETS (FIG 1, DETAIL A; DWG PS217002). ATTACH BRACKET TO STS2

M10-1.50X30mm CAP SCREW, SPLIT LOCK WASHER, AND FLAT WASHER AND TORQUE TO

FLAT WASHER AND TORQUE TO 53 FT-LBS

6. INSTALL

USING

31 FT-LBS.

AND

CHART

320 FT - LBS

HEIGHT HEIGHT MAX: HEIGHT MIN:

36.0" 37.25" 34.75"

HEIGHT TABLE

1.0" NUT

M8 - 1.25 16FT - LBS

M10 - 1.5 31 FT - LBS

M12 - 1.75 53 FT -LBS

STAND:

HARDWARE TORQUE

523409G1 18.0" 19.25" 16.75"

523410G1 24.0" 25.25" 22.75"

523411G1 30.0" 31.25" 28.75"

523412G1

FOOT DETAIL B

RIGHT SIDE VIEW

TYP

2.47"

P/N OF FLOOR

83.9"

36.9"

TOP VIEW

SEE HEIGHT

53

TABLE

FRONT VIEW

A

TYP.

71.55"

MOUNTING

TYP.

2.47"

ALIGN FOOT PARALLEL

TO MOUNTING PLATE AS

PLATE

9.44"

SHOWN

TYP.

BOTTOM VIEW

6" TYP.

Figure 41 Installation drawing, seismic floor stand 800-1000A

STS2 BRACKET

FRONT UPPER

REARFRONT

LEVELER FOOT NUT

SEE DWGS PS217000, PS217002, AND PS217003

NOTE:

FOR DETAILS.

FIG. 2

RIGHT SIDE VIEW OF STS2 WITH UPPER BRACKETS

REAR LOWER

LEVELER FOOT

DETAIL C

BRACKET

Installation Drawings

REAR

PS217001 Rev. 0

FIG. 4

RIGHT SIDE VIEW OF FLOOR STAND

WITH LOWER REAR MOUNTING BRACKET

(2 PLACES)

CAP SCREW M12-1.75X40MM

SPLIT LOCK WASHER M12

FLAT WASHER M12 (SEE DETAIL C)

FRONT UPPER STS2 BRACKETFRONT

(2 PLACES)

FRONT UPPER

STS2 BRACKET

CAP SCREW M12-1.75X40MM SPLIT

LOCK WASHER M12 FLAT WASHER M12

REAR UPPER STS2 BRACKET

FIG. 1

(3 PLACES)

CAP SCREW M12-1.75 x40mm

SPLIT LOCK WASHER M12

FLAT WASHER M12

FRONT

FIG. 3

REAR LOWER STS2 BRACKET

BOTTOM VIEW OF STS2 WITH UPPER BRACKETS

REAR

REAR SIDE

54

TOP VIEW OF FLOOR STAND

WITH LOWER REAR MOUNTING BRACKET

FRONT

Figure 42 Installation drawing, seismic floor stand 800-1000A

RIGHT REAR UPPER STS2

BRACKET

SEE DWGS PS217000, PS217002, AND PS217003

FOR DETAILS.

NOTE:

RIGHT REAR LOWER STS2

BRACKET

UPPER REAR BRACKET TABS TO

SLIDE INTO LOWER REAR

BRACKET SLOTS

Installation Drawings

PS217002 Rev. 0

(2 PLACES)

(2 PLACES)

CAP SCREW M10-1.5X30MM SPLIT

LOCK WASHER M10 FLAT WASHER M10

CAP SCREW M12-1.75X40MM

FIG. 2

REAR RIGHT ISOMETRIC VIEW

SPLIT LOCK WASHER M12

FLAT WASHER M12

LOWER FRONT BRACKET

4 PLACES

DETAIL A

FIG. 3

FIG. 1

RIGHT SIDE VIEW

FRONT RIGHT ISOMETRIC VIEW

A

55

Figure 43 Installation drawing, seismic floor stand 800-1000A

32.1"

RIGHT SIDE VIEW

Installation Drawings

NOTE:

SEE DWGS PS217000, PS217001, AND PS217002

FOR DETAILS.

ISOMETRIC VIEW

PS217003 Rev. 0

84"

RAISED FLOOR

FRONT VIEW

32" 52"

77.0"

56

8.0 INTRODUCTION TO LIEBERT STS2 OPERATIONS

8.1 System Description

A Liebert STS2 provides an automatic, seamless transfer between input power sources to an output
load. The Liebert STS2 monitors the input sources, to ensure each source is operating within set
parameters, as well as ensure that each source is within acceptable tolerances for a transfer between
sources to be completed.

The Liebert STS2 contains two static transfer switches in one enclosure to allow the unit to transfer
its load between the two input sources without disruption to the output for longer than 1/4 cycle.

If a problem is detected with a primary (Preferred) input source and defined trigger points are
reached, the Liebert STS2 automatically switches the input to the other (Alternate) input source. The
Liebert STS2 continues to monitor both sources and can automatically transfer the load back to the
preferred source, if so configured, when that source returns to acceptable operating parameters.

The system control logic automatically monitors the input sources and power output to ensure that
they are operating within acceptable tolerances. The system logic manages the transfer between
sources.

The Liebert STS2 front panel contains either a Color Graphical Display on an LCD touch screen or an
LED display.

The Color Graphical Display provides a menu-driven operator interface, and a display of system infor­mation, status information, a one-line diagram (Mimic) of the Liebert STS2, active alarms, and alarm
history information.

Introduction to Liebert STS2 Operations

The menu selections provide control of the preferred source, manual transfer initiation. Buttons pro­vide for audible alarm silence and reset.

Through the touch screen, specific voltage, current and environmental parameters can be configured
to trigger events that can sound an alarm, write to a history log and either transfer sources or inhibit
a transfer.

In units not equipped with the touch screen, LEDs provide the user with the ability to monitor the
Liebert STS2 and quickly assess problems.

Preferred input source selection, alarm reset and alarm silencing are done through buttons on the
touch screen, or push buttons with the LED display.

Communication options can be installed in the Color Graphical Display (LCD) unit only. These
options provide external communication with the Liebert STS2 through a modem, a network card, a
programmable relay board, a contact isolator, or an RS-422 port to Liebert’s SiteScan.

8.1.1 Redundancy

Redundancy within the Liebert STS2 prevents one component from being a single point of failure,
should a problem occur. Redundant circuits and components are used to eliminate single points of
failure.

Since the Liebert STS2 has two input sources, no single component failure can cause a loss of power to
the load. Redundant power supplies are provided which feed a DC dual-bus used throughout the unit
to prevent any single-point power supply failure modes.

Three separate redundant control logic modules are built into the system. Each contains the logic nec­essary to run the Liebert STS2, and control all transfers.

Redundant fans are provided if a primary fan fails. The redundant fans turn on to prevent overheat­ing inside of the unit.

Should the front panel interface fail, either touch screen or LEDs, the control logic continues to oper­ate and the unit would transfer should a problem be detected on the preferred source. Information on
the monitoring parameters would be available through the remote communication options, if avail­able, or the DB9 (RS-232) connector located next to the LCD display behind the front door. See
Figure 28 on page 41 for details.

57

8.1.2 Reliability and Agency Requirements

The Liebert STS2 is designed for high reliability and high availability with a critical bus Mean Time
Between Failure (MTBF) exceeding 1,000,000 hours.

The Liebert STS2, Control/Power Module and all its options are designed, tested and certified, where
applicable, to meet agency requirements as follows:

• UL 1008: Transfer Switch Equipment, for UL and ULc listing

• UL1459: Telephone equipment (Modem)

•NEC

• FCC Part 15 EMI emission limits for Class A computing devices.

The Liebert STS2 uses conservatively rated components, minimizing the need to go to maintenance
bypass. All maintenance and repair work can be done through the front panel of the unit. This access
makes repairs and maintenance easier.

Gating and control logic are partitioned so that failure of one source’s gating or sensing logic does not
prevent the switch from transferring to the other source.

All control and logic components are mounted separate from the power components. The Liebert STS2
is designed to minimize the exposure of hazardous voltages to allow safe servicing of the unit while
the load is energized.

All electrical components requiring normal maintenance are replaceable without de-energizing the
load, as long as one source is available. Solid-state switching devices are packaged to allow safe repair
of those devices without having to de-energize the load. All non-automatic switches or circuit breakers
are the plug-in or draw-out type to allow replacement without de-energizing the load. All solid-state
power switching devices are rated to prevent hazardous device failure in power systems with avail­able fault currents up to the defined limits, as listed in 15.1.5 - Electrical Requirements.

Introduction to Liebert STS2 Operations

8.1.3 Factory Backup and Service Assistance

Because improper installation can cause a system to fail, a Liebert Services service technician should
thoroughly inspect the unit to ensure it is properly installed and its operating parameters are prop­erly configured.

Once the Liebert STS2 is properly installed, you, as the on-site operator, can easily monitor the unit’s
operation utilizing the touch screen or LEDs.

If you need assistance, or have questions, contact Liebert for technical support at 1-800-LIEBERT
(800-543-2378).

8.2 Modes of Operation

8.2.1 Normal (Preferred Source)

Under normal operating conditions, the Liebert STS2 routes power from the preferred input source to
the output load. The unit monitors the voltage current and phase of each source to ensure that both
are operating within set tolerances, and that the alternate source is available, should a transfer be
required

8.2.2 Transfer

Should the preferred source fail or be outside acceptable voltage limits, the Liebert STS2 transfers
the input to the alternate source until the problem is rectified in the preferred source. The unit can be
set to automatically transfer the input back to the preferred source, or only allow the transfer to be
done manually.

8.2.3 Transfer Inhibit

For a transfer to be completed between input sources, the sources must meet certain parameters, or
the transfer cannot take place. Uninterrupted transfer between sources is inhibited due to input
source failure, sources out of sync, switch failure, or the unit is in bypass mode.

58

8.2.4 Bypass

The static transfer switch can be manually bypassed to allow the power from a source to directly flow
to the output load. This bypass allows the unit’s electronics to be serviced without dangerous voltages
being present.

The Liebert STS2 includes key-interlocked maintenance bypass breakers that allow either input
source’s electronics to be bypassed for maintenance without interruption of power to the load. The
maintenance bypass allows all electronics to be isolated from the input, output, and bypass connec­tions. Bypass instructions are available from the touch screen and are discussed later in this manual.

8.3 Operator Controls

The Liebert STS2 is equipped with an interface to configure and monitor the unit either locally or
remotely. The Color Graphical Display is a touch screen LCD that provides a color diagram (Mimic)
that displays the current status of the unit. System parameters are displayed and help is available to
define events. See Figure 44 below and Figure 30. The touch screen menus allow the operator to ini­tiate source transfers, view event and history logs, and view bypass and other operational instruc­tions.

Figure 44 Liebert STS2 touch screen display

Mimic

Introduction to Liebert STS2 Operations

Event controls

Display Panel
and

Event Display

Help Screen

Menu Options

Touch screen control buttons allow you to reset alarms, silence the audible alarm, review configura­tions, event and history logs, preferred source, startup and bypass procedures, and the help menu.
Qualified personnel, with a password, can use these menus to configure parameters, select a pre­ferred source and do manual source transfers.

LED display units do not have the color LCD touch screen. Instead of the touch screen, these units are
monitored by a series of LEDs and controlled by a series of push buttons.

Both units can be accessed from a terminal, or a PC running terminal emulation software, that is
attached to the unit. Through the RS-232 access, you can monitor and configure the unit, plus
remotely select a preferred source. See 12.1 - Using the RS-232 Port on page 76 for instructions on
using the RS-232 interface.

59

9.0 THEORY OF OPERATION

9.1 General Description

The Liebert STS2 contains all the equipment necessary to prevent an interruption in power flow to
the AC load, should your primary source fail.

9.1.1 Liebert STS2 Static Transfer Switch

The Liebert STS2 is a 3-pole, double-throw, solid state automatic transfer switch that is fed from two
sources. The Preferred source is the input source that normally carries the load when both sources are
available. The preferred source is selectable by the user from the LCD panel or an optional Remote
Source Selection. The unselected source is referred to as the Alternate source and carries the load if
the preferred source should fail or if a manual transfer is initiated.

The unit uses Silicon Controlled Rectifiers (SCRs) connected in parallel, opposing pairs to function as
an AC switch configuration. Three pairs of SCRs connect the AC load to the selected preferred input
source as long as the preferred source is available. A second set of SCRs stands ready to transfer the
AC load to the alternate input source should the preferred source fail. The switching action is a very
fast, break-before-make with less than a 1/4 cycle break in the AC waveform.

During static switch transfers and retransfers, the conduction state of the SCRs is carefully moni­tored and controlled to prevent a current path from one source to the other. This technique prevents a
faulted source from feeding into the other good source.

Theory of Operation

9.1.2 Source Transfer

The Liebert STS2 allows manually initiated transfers between the two sources, providing the alter­nate source is within acceptable voltage limits and phase tolerances with the preferred source. You
begin a manual transfer by selecting the inactive source as the preferred source. On a manual trans­fer, the Liebert STS2 transfers between the two sources with less than one (1) millisecond interrup­tion of power to the load. The transfer can only be completed when both sources are available and
synchronized within the user-adjustable phase synchronization window. For sources where the two
frequencies are not exactly in phase, manually initiated transfers are delayed by the Liebert STS2
until the two sources are within the defined phase synchronization window.

Source selection can also be done remotely using the Remote Source Selection option, if installed.

9.1.3 Automatic Transfer/Retransfer

If the preferred source is out of voltage and/or frequency limits, the load is automatically transferred
to the alternate source. The default transfer voltage limits comply with the limits of the IEEE Std.
446-1995 computer voltage tolerance envelope.

If the unit is so configured, the load is retransferred automatically to the preferred source after the
preferred source returns to within the acceptable voltage and frequency limits for at least the defined
retransfer time delay, and is in phase with the alternate source. You can enable and disable auto­matic retransfer to the preferred source through a user configuration setting.

Automatic Retransfer Inhibited

If the system makes five transfers from the preferred source to the alternate source in a five minute
period, automatic retransfers back to the preferred source is disabled.

To clear this alarm condition, you must assign the alternate source as the preferred source.

Also, the UV detection thresholds may need adjustment. See Source Set Points on page 90 for
instructions on setting the UV detection.

This alarm also is cleared if the unit transfers to the preferred source due to an alternate source AC
volt failure (i.e., an emergency transfer.)

60

9.1.4 Emergency Transfer

To ensure that power remains connected to the load, the Liebert STS2 automatically performs an
emergency transfer from one input source to the other when an outage occurs on the existing source.
The automatic transfer takes place if the other source’s voltage is within acceptable limits, and
regardless of the phase difference between the two sources.

Emergency transfers occur with a loss of power on the output of less than 4 ms.

Emergency transfers from the alternate source to the preferred source are not affected by the Auto
Retransfer Enabled/Disabled or Retransfer Delay user settings.

9.1.5 Load Current Transfer Inhibit

The Liebert STS2 senses the load current. If the load current exceeds the preset level deemed to rep­resent a load inrush or fault condition, the unit’s logic disables manual and automatic transfers, even
if the selected source’s input voltage is outside the acceptable limits. This event triggers an I-Peak
alarm. If so configured, the Load Current Transfer Inhibit is automatically reset after the current and
voltage return to within normal parameters. This reset provides continued protection against a
source failure. The Load Current Transfer Inhibit also can be programmed to require a manual reset.
See step 14. on page 92 under the Source Set Points heading for details.

9.1.6 SCR Failure

The Liebert STS2 continuously monitors the status of the SCR switching devices for proper operation.
In the event of a shorted SCR on the input source powering the load, the Liebert STS2 automatically
triggers an alarm and trips open the other source isolation breaker. In the event of a shorted SCR on
the other input source, the Liebert STS2 automatically triggers an alarm and trips open the other
source isolation breaker.

Theory of Operation

In the event of an open SCR, the switch automatically triggers an alarm and transfers the load to the
other source. All open and shorted SCR alarm conditions are latched and require the system to be
repaired and reset to restore normal operation.

9.1.7 On/Off Sequence

The Liebert STS2 contains no master On/Off push button control. When connected to the input
sources, the unit’s logic power comes on automatically. The touch screen display (if so equipped) is
active as long as at least one input source is energized and the Control Power Disconnect (located
inside the static switch) is on.

9.2 Detailed Component Description

9.2.1 Controls

Operator Interface

The Liebert STS2 Color Graphical Display unit contains a touch screen color LCD to provide the oper­ator interface to control and configure the operation of the unit and quickly diagnose problems. A
password and an optional keylock, if installed, are provided for security.

The LED Display unit includes push buttons for source transfer, alarm reset and audible alarm
silence.

61

Theory of Operation

Hardware

• The Liebert STS2 operator interface in the Color Graphical Display unit is designed to provide all
of the information required to configure and monitor the unit’s operation.

• The control logic performs automatic operations with minimal operator interface.

• Each Liebert STS2 unit is equipped with either a color LCD touch screen or a panel of LEDs and
push buttons.

• The Liebert STS2 can have optional communication ports installed. See 6.0 - Options and 12.0 -
Communication Interfaces on page 76 for more information on communication options.

• On LED Display units, the RS-232 interface is used for configuration and status and event log
monitoring. The RS-232 interface can also be used with the Color Graphical Display units, if nec­essary.

Firmware

The operator interface enables you to monitor the Liebert STS2, to configure set points for transfers,
monitor system parameters and access event and history logs. The firmware is accessible through the
LCD touch screen (if installed) or the RS-232 interface. The firmware includes:

• View and set the preferred source.

• View and configure setpoints.

• View alarms, faults and status.

Additionally, the Color Graphical Display unit provides:

• The mimic graphical representation of the systems operation.

• Menu driven monitoring and configuration.

• Step-by-step instructions to assist you in the start-up, shut-down and bypass operations.

• Help on event messages.

• Touch screen alarm reset and silence buttons.

Events in the system, both faults and alarms, are detected and displayed on the LCD. See 11.0 -
Alarm and Faults on page 71 for more information on events.

• A set of event masks can be configured through the LCD to trigger a system response to an event.
See 11.1 - Event Mask.

• Report event conditions from other components of the system.

• Monitor and report changes in event condition states. If the event condition’s state changes from
inactive to active, a new event is detected. If the transition is from active to inactive, the event con­dition has cleared.

• Process new faults and alarms, and clear inactive alarms.

• Provide the alarm reset and silence options.

9.2.2 Circuit Breakers

Three circuit breakers provide total isolation of the solid-state switching devices with an input
breaker for each source and a load isolation breaker. Two breakers provide for maintenance bypass­ing of the solid-state switching devices to either input source.

All switches in the Liebert STS2 are plug-in types, which allows any switch to be replaced without de­energizing the output bus. The Merlin Gerin breakers have an interlock in the plug-in base, which
prevents the switch from being withdrawn in the CLOSED position. The switch trips OPEN before it
disconnects from the plug-in base.

See 15.2.5 - Circuit Breakers for specifications and more information pertaining to the circuit
breakers. See Figure 14 to Figure 19 for circuit breaker locations. The circuit breaker schedule is
provided in Figure 20.

9.2.3 SCRs

Brick-type SCRs are used rated to carry the full 100% rated load. Because the unit is a fuseless design
with non-automatic circuit breakers, overcurrent protection is provided by upstream circuit breakers.

62

9.2.4 Logic Modules

The logic contains three separate redundant logic modules. The modules contain the logic necessary
to run the Liebert STS2 and control transfers and shunt trips under all circumstances, without any
outside assistance once set-up and started properly.

9.2.5 Audible Alarm

An audible alarm is installed on the control board. This alarm is triggered by an alarm condition
detected on the unit. The alarm can be turned off from the touch screen (Color Graphical Display
units) or by a push button (LED Display units). Turning off the audible alarm does not clear or reset
the condition that triggered the alarm.

9.2.6 RS-232 Port

An RS-232 serial port is provided to allow an external terminal to be connected as another user inter­face. See 12.1 - Using the RS-232 Port on page 76 for more information on using the RS-232 port.

Theory of Operation

63

Operating Instructions for the Touch Screen Interface

10.0 OPERATING INSTRUCTIONS FOR THE TOUCH SCREEN INTERFACE

CAUTION

!

Before the unit is placed into service for the first time, after equipment relocation, or after the
equipment has been de-energized for an extended period of time, a thorough equipment
inspection and supervised startup by qualified personnel are strongly recommended. Contact
your local Emerson Network Power representative or Liebert Services at 1-800-543-2378 to
arrange for equipment inspection and startup.

After the initial equipment startup, the following operating guidelines can be used for standard
equipment operation. These guidelines should be reviewed for any special equipment modifications,
special site conditions, or company policies that may require changes to the standard equipment oper­ation.

All programmable functions are preset at the factory to enable the unit to be brought up without the
need to enter all selectable parameters.

This section refers to the LCD touch screen display. This display is discussed in more detail later in
the manual. See 13.0 - Liebert STS2 Touch Screen Display.

NOTE

If the front panel of your Liebert STS2 has LEDs and push buttons instead of the touch screen
interface, refer to 14.0 - Operating the Liebert STS2 LED Display for operating
instructions.

See Figures 14- 19 for circuit breaker locations.

64

10.1 Normal System Turn-On

NOTE

If your Liebert STS2 is connected to a PDU with a Wye configuration, enable the Wye Output
Transformer before starting the system. This setting can be made from the touch screen. Refer
to Wye Output Transformer on page 100 for instructions.

1. Ensure that all Liebert STS2 breakers—CB1, CB2, CB3, CB3A (if supplied), CB4, and CB5—are
in the OFF position.

a. Ensure that the key interlocks for CB1 and CB2 have their bolts retracted.
b. Ensure that the key interlocks for CB4 and CB5 have their bolts extended, thus preventing

CB4 or CB5 from being turned ON.

2. Source/input power should be applied to both Liebert STS2 inputs.
The touch screen control panel should become active and operate properly when at least one of the

inputs is energized is closed.

3. Verify that nominal input voltages are applied to both inputs (Source 1 and Source 2).
The input voltages, selected preferred source, breaker and switch status, and alarms are indi-

cated on the Mimic screen.

Figure 45 Liebert STS2 touch screen display

Mimic

Sources

Operating Instructions for the Touch Screen Interface

Static

Event controls

Event display

Transfer
Switch

4. Close CB1.

5. Verify that Source 1 voltages are nominal and CB1 breaker status is correctly indicated on the
Monitor/Mimic screen.

6. Close CB2.

7. Verify that Source 2 voltages are nominal and CB2 breaker status is correctly indicated on the
Mimic screen.

8. Verify that boxes for the preferred source and corresponding static transfer switch are
highlighted on the Mimic screen, indicating which side of the Static Transfer Switch is on.

9. Close Output Breaker CB3 (and CB3A in redundant output configurations).

10. Verify CB3, the Output box, and the Load box are highlighted, indicating that CB3 is closed and
the Output and Load are energized.

NOTE

For redundant output switch units, CB3 descriptions apply to CB3 and CB3A.

11. Press the RESET button on the touch screen to reset any previous alarms.

12. Verify in the Event Display and the Mimic that there are no active alarms.
If any active alarms are displayed, refer to 11.0 - Alarm and Faults for a description of the

alarms and possible causes. All active alarm conditions should be corrected before proceeding.

13. Turn on the load equipment following the load equipment manufacturer’s recommendations.

65

Operating Instructions for the Touch Screen Interface

10.2 Manual Transfer / Preferred Source Selection

The Source Transfer option (Source Xfers) in the touch screen menu allows you to select a preferred
source. Transfers are only permitted when the voltage and current are within their proper operating
range and the sources are synchronized. The Source Transfer screen indicates the synchronization
between the two sources, while the voltage and frequency are displayed on the Mimic. See Figure 46.
Transfer is inhibited if the deviation exceeds the parameter set in the Source Set Points. See User

Settings on page 89

NOTE

If one source will be de-energized for an extended period (hours or days), set the unit to bypass
mode for the remaining source. Without using bypass, if a failure occurs in the switch
components for remaining source, the Liebert STS2 does not have a second source to switch to
and the load would not receive power. See Maintenance Bypass on page 67 for bypass
instructions.

If your system contains the LED front panel instead of the LCD touch screen, refer to 14.2.2 - Man­ual Transfer / Preferred Source Selection for instructions on this procedure.

Figure 46 Source transfer screen

66

Operating Instructions for the Touch Screen Interface

To manually select the preferred source:

1. Verify that the input breakers CB1 and CB2 are closed.

2. Select SOURCE XFERS from the menu bar.
The Select Preferred Source screen is displayed in the Event Display.

3. Check the Mimic to verify that Source 1 and Source 2 input voltages are correct.

4. Select SOURCE 1 or SOURCE 2 as your preferred source.
When conditions are correct, the switch transfers the load to the alternate source by selecting the

alternate source as the preferred source.
This source is now monitored as the preferred source throughout the various configurations set up

through the touch screen.

5. Verify that the correct source is designated as the preferred source and that the input source
changes to the desired source.

The Mimic is updated to indicate the new preferred source. The source is now highlighted with blue
and that source is labeled as the preferred source.

If the Transfer Inhibit message is displayed, check for alarm messages on the Active Status window.
Correct alarm conditions before attempting a source transfer.

NOTE

The preferred source may also be changed via the optional Remote Source Selection option,
thereby initiating a transfer remotely.

10.3 Enabling Remote Source Selection

If your system is equipped with the optional Remote Source Selection option, it must be enabled.

If you your system includes the Color Graphical Display:

1. Select CONFIG from the menu bar.

2. Select SYSTEM SETTINGS from the Configuration menu.

3. Select SYSTEM OPTIONS from the System Settings menu.

4. Select YES for the REMOTE SOURCE SELECT choice.

If your system contains the LED display or you are configuring the system from the RS-232 port, see

12.1 - Using the RS-232 Port on page 76 for instructions on using the that interface.

10.4 Maintenance Bypass

The Liebert STS2 is equipped with two key-interlocked, bypass breakers, CB4 and CB5, to allow man­ual bypass of the switch electronics for either input source in the event of switch failure or for mainte­nance of the switch. Refer to the static transfer switch one-line diagram (Figure 3). While operating
on maintenance bypass, all voltages are removed from the Liebert STS2 electronics to facilitate safe
repair, without de-energizing the load using a make-before-break switching sequence.

However, the unit can be bypassed using a make-before-break switching sequence only to the same
source to which that the switch is connected, as indicated by the highlighted static transfer switch box
on the Mimic screen.

In the event of source or switch failure, the unit should be bypassed only to the current input source.
For convenience, instructions for the bypass procedure can be displayed on the touch screen by select­ing the BYP. PROC option from the menu bar.

The Mimic is used to verify the status of the unit during the bypass procedures. In the unlikely event
that the Color Graphical Display is not available, open the front door and look through the slots in the
control door. If you can see green LEDs on the gate driver board through that slot, then the unit is
connected to the source referenced on the label below that slot. See Figure 47.

67

Figure 47 Gate board viewing slot locations

Viewing Slot for
the Source 2
Gate Drive
Board

Operating Instructions for the Touch Screen Interface

Touch Screen

Viewing Slot for
the Source 1
Gate Drive Board

GREEN LEDS ON THE
GATE DRIVER BOARD
ARE VIEWABLE
THROUGH THIS SLOT
INDICATE THAT THE
STS IS ON SOURCE 1

GREEN LEDS ON THE
GATE DRIVER BOARD ARE
VIEWABLE THROUGH THIS
SLOT INDICATE THAT THE
STS IS ON SOURCE 2

GREEN LEDS ON THE
GATE DRIVER BOARD
ARE VIEWABLE THROUGH
THIS SLOT INDICATE THAT
THE STS IS ON SOURCE 1

If the Color Graphical Display is not available, you can still use the following bypass procedures,
ignore the steps to check the display and check the LEDs.

If your system contains the LED display, see 14.2.3 - Maintenance Bypass.

68

10.4.1 Bypass Procedures for Source 1

To bypass the switch for Source 1:

NOTE

If you wish to bypass the Source 1 static transfer switch but Source 2 is presently active, you
must first transfer to Source 1. See Manual Transfer / Preferred Source Selection on
page 66.

1. Verify Source 1 is supplying power via the Mimic.

• If the Color Graphical Display is not available, check the gate driver board LEDs through the

slots in the control panel. See Figure 47.

2. Remove interlock key from CB5 and place it in the CB4 interlock.

3. Open the alternate source input breaker CB2.

4. Rotate and remove the interlock key.

5. Insert the key in the CB4 bypass breaker interlock.

6. Rotate interlock keys in CB4 bypass breaker interlock to retract interlock.

7. Close bypass breaker CB4.

8. Verify the breaker status on the Mimic screen.

9. Open source input breaker CB1.

10. Rotate the interlock key and remove it to lockout the breaker.

11. Secure the key, per your site’s lockout/tagout procedure.

12. Open output breakers CB3 and CB3A (if supplied) to remove power from static switch.

Operating Instructions for the Touch Screen Interface

To return to the normal mode:

1. Remove the key from CB5 and insert it in the CB1 breaker interlock.

2. Rotate key to retract interlock.

3. Close source input breaker CB1.

4. Verify the Source 1 and CB1 breaker status on the Mimic screen.

5. Close output breakers CB3 and CB3A (if supplied).

6. Verify CB3 and CB3A breaker status and STS SOURCE 1 and OUTPUT boxes are highlighted on
the Mimic screen.

7. Open bypass breaker CB4.

8. Rotate the keys in CB4 interlock to extend the interlock.

9. Remove the proper key from CB4 interlock and insert it into CB2 breaker interlock.

10. Rotate the key to retract the CB2 breaker interlock.

11. Close source input breaker CB2.

12. Verify the STS SOURCE 2 box and CB2 breaker status on the Mimic screen.

• If the Color Graphical Display is not available, check the gate driver board LEDs through the

slots in the control panel. See Figure 47.

69

10.4.2 Bypass Procedures for Source 2

To bypass the switch for Source 2:

NOTE

To bypass the Source 2 static transfer switch when Source 1 is presently active, you must first
transfer to Source 2. See Manual Transfer / Preferred Source Selection on page 66.

1. Verify Source 2 is supplying power via the Mimic.

• If the Color Graphical Display is not available, check the gate driver board LEDs through the

slots in the control panel. See Figure 47.

2. Remove the interlock key from CB4 and place it in CB5 interlock.

3. Open the alternate source input breaker CB1.

4. Rotate and remove the interlock key.

5. Insert the key in the CB5 bypass breaker interlock.

6. Rotate interlock keys in the CB5 bypass breaker interlock to retract the interlock.

7. Close bypass breaker CB5.

8. Verify the breaker status on the Mimic screen.

9. Open source input breaker CB2.

10. Rotate the interlock key and remove it to lockout the breaker.

11. Secure the key, per your site’s lockout/tagout procedure.

12. Open output breakers CB3 and CB3A (if supplied) to remove power from static switch.

To return to normal mode:

1. Insert the key in the CB2 breaker interlock.

2. Rotate the key to retract the interlock.

3. Close source input breaker CB2.

4. Verify Source 2 and CB2 breaker status on the Mimic screen.

5. Close output breakers CB3 and CB3A (if supplied).

6. Verify CB3 and CB3A breaker status and STS SOURCE 2 and OUTPUT boxes are highlighted on
the Mimic screen.

7. Open bypass breaker CB5.

8. Rotate the keys in CB5 interlock to extend the interlock.

9. Remove the proper key from CB5 interlock and insert it into CB1 breaker interlock.

10. Rotate the key to retract the CB1 breaker interlock.

11. Close source input breaker CB1.

12. Verify the STS SOURCE 1 box and CB1 breaker status on the Mimic screen.

• If the Color Graphical Display is not available, check the gate driver board LEDs through the

slots in the control panel. See Figure 47.

Operating Instructions for the Touch Screen Interface

10.5 Normal System Shutdown

The Liebert STS2 can be shut down from either the static switch mode or the bypass mode.

10.5.1 Shutdown in Static Transfer Switch Mode

When the Liebert STS2 is operating on static transfer switch mode (not maintenance bypass mode):

1. Turn off the load equipment per manufacturer’s recommendations.

2. Open CB3 to turn off the static switch output.

• Open CB3A if the static transfer switch has a redundant output configuration.

3. Open the input switches CB1 and CB2.

4. To completely de-energize the unit, turn OFF power to both inputs to the Liebert STS2.

10.5.2 Shutdown in Maintenance Bypass Mode

When the Liebert STS2 is operating on bypass:

1. Turn off the load equipment per manufacturer’s recommendations.

2. Open the bypass switch (CB4 or CB5) to turn off the static transfer switch output.

3. To completely de-energize the unit, turn OFF the power to both inputs to the Liebert STS2.

70

11.0 ALARM AND FAULTS

Alarms and faults are events that are triggered when the operation of the static transfer switch falls
outside the defined parameters. These events can also be triggered by: user actions, such as changing
configurations, clearing logs, etc.; failed components such as a fan failure, an SCR that is open or
closed, etc.; and system status, such as open circuit breakers, load on alternate source, etc. These
events can provide a warning or trigger the system to make a change, such as switch sources or the
recording of a history log.

The Liebert STS2 monitoring system detects and annunciates a comprehensive set of fault and alarm
conditions. Faults and alarm messages are can be viewed on the LCD touch screen or via the RS-232
port.

On the LCD touch screen, the events are shown in the Status Display panel in the lower left corner of
the touch screen and written to the Event log. You can touch a message to view a definition of an
event and a tip for troubleshooting. See 13.0 - Liebert STS2 Touch Screen Display for more infor­mation on the touch screen.

If you are monitoring the system through the RS-232 port, see Table 9 - Terminal commands on
page 77 for the commands to view event logs, and alarm and fault lists.

Event actions can be triggered by the settings configured from the Event Masks. See 11.1 - Event

Mask for more information.

Faults — A fault indicates that a component of the Liebert STS2 has failed or has been damaged. In

the Event Display, faults are indicated in red.

Alarm and Faults

Alarms — An alarm is an event caused by a significant abnormal system condition. In the Event Dis­play, alarms are indicated in yellow. The setpoints for many of the alarms are configurable through
the User Settings. Many alarms clear themselves when the condition is resolved. If an alarm event
mask is set to latch, the alarm messages remain active until the alarm condition has been corrected
and the RESET button is pushed. See 11.1 - Event Mask for more information on latching.

When the system is furnished with an external modem and a telephone line is connected to the
modem, the system can be programmed to automatically dial out upon occurrence of any of certain
designated alarms. The auto-dial feature can be configured for alarms using the Event Mask option in
the touch screen. See Configuring the Modem on page 94 for instructions on for setting up your
modem.

11.1 Event Mask

The Liebert STS2 gathers, processes and reports faults and alarms, collectively referred to below as
events. The Event Mask dialog box allows you to set the system’s response for specific alarms and
faults that are generated.

The following mask types are available for each event:

• Latch — If a latch is enabled for the selected event, that event remains active even if the originat-

ing event condition clears. A latched event may only be cleared by pushing the RESET button
(ALRMRST on the LED units).

• Dial Out — If the selected event is triggered, the system automatically calls the specified tele-

phone numbers through a modem. For example, a page could be sent or an event could be sent to
a external terminal, via a modem. See Communication Interfaces on page 76 for more infor­mation on configuring communications options.

• Event Log — The selected event is date/time stamped and recorded to the Event Log when the

event is triggered.

• Audible — If the selected event is triggered, an audible beeper or horn is sounded by the Liebert

STS2. The beeper continues while this event is active or latched, or until the SILENCE button
(NOAUD on the LED units) is pushed. This button must be pushed with the ALRMRST button on
the LED units.

See Event Masks on page 88 for instructions on setting the mask type via the touch screen display.
See the 12.1.4 - Setting Event Masks with the Terminal on page 83 for instructions on configura­tion using the RS-232 port.

71

11.2 Event and History Logs

The system tracks events through the Events Log and tracks significant events through the History
Logs. These logs allow you to quickly spot trends or diagnose problems that the unit may have had.
Both logs are written in nonvolatile memory.

The logs can be accessed from the touch screen menu or the RS-232 port. See 13.6.2 - Logs for more
instructions on viewing the logs from the touch screen. See Table 9 - Terminal commands on
page 77 for the RS-232 interface commands used to access the logs.

11.2.1 Event Log

The events are tracked in sequence of occurrence. The sequence of occurrence is identified by date,
time, and frame number. The last 512 events are stored in a nonvolatile memory and can be viewed
from the Event Log.

Event logs wrap, meaning when the log is full, the oldest event is deleted when a new event is written
to the log.

The Event Log tracks:

• # — the sequence number in which the event occurred since the log was last cleared.

• Message — the event that occurred, such as Ambient Overtemp., Source 1 Fail, etc.

• Type — either a Fault or Alarm. See 11.0 - Alarm and Faults on page 71 for further details on

these events.

• ID — the event identifier.

• Date and Time — when the event occurred.

• Faults — the number of fault events logged.

• Alarms — the number of alarm events logged.

• User Alarms — the number of alarm events logged that were triggered by user-created alarms,

such as those alarms created with the Input Contact Isolator settings.

• Total — the sum of all the events currently logged.

Alarm and Faults

11.2.2 History Log

When a designated major alarm occurs, the History Status buffer is frozen, capturing 64 sequential
frames before and after the alarm condition. When the History Status buffer is frozen, a History Log
is created.

Two History Logs are available to track major alarms. This log includes the triggering event plus the
surrounding events, and the system voltages, currents, frequency, power, source selection and
breaker positions at the time of the event. The History Log displays the 64 sequential frames, in
4-millisecond intervals, of the Present Status screens surrounding the event.

If you are viewing the log from the touch screen, the Mimic and the Event Display show the data that
was present as the alarm was triggered. The data is displayed as frames are played.

The History Log allows you to replay the events leading up to the alarm and the events right after the
alarm to see the status of the switch at that time and diagnose the cause of the alarm. The History
Log is triggered when certain events are tripped that have the Freeze option enabled.

You can run through the frames sequentially. The sequence of the events is identified by date, time,
and frame number. The History Log frames are stored in a nonvolatile memory buffer that is continu­ously overwritten until a designated fault condition occurs. When the fault occurs to trigger a freeze,
the History Log stores the next 23 frames, then freezes until it is reset. The History Log then keeps 40
frames before the fault, the frame where the fault occurred, plus the next 23 frames.

The History Log should not be reset until the fault condition that caused the buffer to freeze is
reviewed and investigated by a qualified service technician. After the alarm condition has been cor­rected, the History Log can be cleared.

72

The History Log has the following fields:

• Replay Rate — indicates how long it takes for the replay to play. Use the UP and DOWN buttons

to set the time.

• Status — the status of the Liebert STS2 at the point of the current frame in the replay. The His­tory log has three statuses: Frozen, Not Frozen and Retrieving Data, please stand by.

• Critical Event — The event which triggered this log to be written. The event is indicated in red on
the bar graph.

• Frame Number — the current frame in the replay. A negative number indicates the replay is at a
point before the triggering event occurred.

11.3 Alarm Notes

The I-PK on Source 1 and I-PK on Source 2 alarms inhibit automatic transfer due to an overload or
load fault. These alarms can be set for either auto or manual alarm reset.

In the auto reset mode, the alarm is reset as soon as the load current and source voltage return to nor­mal, and transfers are no longer inhibited. In manual mode, the alarm remains active and transfers
are inhibited until the conditions return to normal and the user manually presses the RESET button
(ALRMRST button on LED units). In either case, the cause of the Source 1 or Source 2 I-Peak over­load should be investigated and resolved (such as by reducing the overload condition or clearing the
output fault) before returning the switch to normal operation.

These events indicate a device failure. The device must be replaced and the system must be restarted
for the fault to clear. A shorted SCR automatically trips open a source input switch (CB1 or CB2) to
prevent transfers in the event of an SCR failure. The SCR failure must be investigated and repaired
before returning the switch to normal operation. Both source input switches must be opened (such as
when the unit is placed in maintenance bypass for servicing) before a shorted or open SCR alarm can
be reset.

Alarm and Faults

11.4 List of Messages

Table 8 lists available event messages, a definition of the event, and the functions that are activated
with the event by default. The functions are indicated as follows:

D — The indicated event initiates the Auto-Dial sequence through a modem.
A — The indicated event activates the Audible alarm.
F — The indicated event triggers a Freeze of the History Log.
L — The indicated event Latches. A latched alarm remains displayed until the alarm condition

has cleared and the RESET (ALRMRST) button has been pressed.
E — By default, all faults and alarms are written to the Event Log. Changing this setting is only

available for the LED units and is set through the RS-232 port. See Setting Event Masks with

the Terminal on page 83

All of these functions, except Freeze, can be reconfigured to trigger for each event, using the Event
Mask option. See 11.1 - Event Mask on page 71. The Freeze function is hard-coded and cannot be
changed for an event.

If the front panel of your Liebert STS2 has LEDs and push buttons instead of the touch screen inter­face, you can view these messages via the RS-232 port. See 12.1.1 - Connecting and Using a
Terminal on page 77 for the commands to view the event messages on a PC terminal.

An LED is used to indicate the presence of any active fault or alarm. Refer to 14.0 - Operating the
Liebert STS2 LED Display for more information about the LEDs.

73

Alarm and Faults

.

Table 8 Event messages

ID Alarm Message Description/Cause Action

001 S1 SCR SHORT One or more of the SCRs for Source 1 have shorted and failed. D, F, A, E

002 S2 SCR SHORT One or more of the SCRs for Source 2 have shorted and failed. D, F, A, E

003 S1 SCR OPEN One or more of the SCRs for Source 1 is open. D, F, A, E

004 S2 SCR OPEN One or more of the SCRs for Source 2 is open. D, F, A, E

005 PRIMARY FAN FAIL A primary cooling fan has failed and the unit is now being

cooled by a secondary fan, which is not monitored.

006 CONTROL MODULE FAIL Control logic module has failed. D, A, E

007 PWR SPLY DC A FAIL Power supply DC bus A has failed. D, A, E

008 PWR SPLY DC B FAIL Power supply DC bus B has failed. D, A, E

009 PWR SPLY S1 AC FAIL Power supply Source 1 AC has failed. D, A, E

010 PWR SPLY S2 AC FAIL Power supply Source 2 AC has failed. D, A, E

011 PWR SPLY LOGIC FAIL A power supply module has failed. D, A, E

012 OUT VOLT SENSE FAIL The output volt sense module failed D, A, E

013 S1 VOLT SENSE FAIL The Source 1 volt sense module failed. D, A, E

014 S2 VOLT SENSE FAIL The Source 2 volt sense module failed. D, A, E

015 S1 SCR SENSE FAIL The Source 1 SCR sense module failed. D, A, E

016 S2 SCR SENSE FAIL The Source 2 SCR sense module failed. D, A, E

017 S1 CURR SENSE FAIL The Source 1 SCR current module failed. D, A, E

018 S2 CURR SENSE FAIL The Source 2 SCR current module failed. D, A, E

019 S1 GATE DRIVE FAIL The Source 1 gate drive module failed. D, A, E

020 S2 GATE DRIVE FAIL The Source 2 gate drive module failed. D, A, E

021 INTERNAL COMM FAIL Internal CAN communications failed. D, A, E

022 EXTERNAL COMM FAIL Options CAN communications failed. A, E

023 CB1 SHUNT TRIP FAIL CB1 shunt trip failed. A, E

024 CB2 SHUNT TRIP FAIL CB2 shunt trip failed. D, A, E

064 HEATSINK OVERTEMP Heatsink has exceeded the recommended temperature. A, E

067 S1 UV Source 1 under voltage, fast detection. A, E

068 S1 UV (RMS) Source 1 under voltage, slow detection. L, A, E

069 S1 OV Source 1 over voltage A, E

070 S1 OF/UF Source 1 over frequency/under frequency A, E

071 S1 FAIL Source 1 failure. A, E

072 S2 UV Source 2 under voltage, fast detection. A, E

073 S2 UV (RMS) Source 2 under voltage, slow detection. A, E

074 S2 OV Source 2 over voltage. A, E

075 S2 OF/UF Source 2 over frequency/under frequency. A, E

076 S2 FAIL Source 2 failure. A, E

077 S1 OVERCURRENT Source 1 over current. A, E

078 S2 OVERCURRENT Source 2 over current. A, E

079 S1 I-PEAK I-PK on Source 1. A, F, E

080 S2 I-PEAK I-PK on Source 2. A, F, E

081 SOURCES OUT OF SYNC Source 1 and Source 2 are out of synchronization. A, E

082 LOAD ON ALT SOURCE The output load is running on the alternate source. A, E

083 AUTO REXFER INHIBIT Automatic retransfer is inhibited. A, E

D, A, E

74

Alarm and Faults

Table 8 Event messages (continued)

ID Alarm Message Description/Cause Action

084 CB1 (S1) OPEN Source 1, Circuit Breaker 1 is open. A, E

085 CB2 (S2) OPEN Source 2, Circuit Breaker 2 is open. A, E

086 CB4 (S1 BYP) CLOSED Source 1 on bypass, Circuit Breaker 4 is closed. A, E

087 CB5 (S2 BYP) CLOSED Source 2 on bypass, Circuit Breaker 5 is closed. A, E

088 CB3 (OUTPUT) OPEN Output circuit breaker (CB3) is open. A, E

089 CB3A (OUTPUT) OPEN Output circuit breaker (CB3A) is open. A, E

090 S1 PHASE ROT ERROR Source 1 phase rotation error. A, E

091 S2 PHASE ROT ERROR Source 2 phase rotation error. A, E

092 TRANSFER INHIBITED Transfer inhibited. A, E

093 OUTPUT UV Output is under voltage. D, F, A, E

INPUT CONTACT #1

120

INPUT CONTACT #2

121

INPUT CONTACT #3

122

INPUT CONTACT #4

123

INPUT CONTACT #5

124

INPUT CONTACT #6

125

INPUT CONTACT #7

126

INPUT CONTACT #8

127

128 CONFIG MODIFIED A set point configuration has changed. A, E

129 PASSWORD CHANGED The password for touch screen access has been modified and

130 TIME REPROGRAMMED The system’s time has been reset and saved. A, E

131 DATE REPROGRAMMED The system’s date has been reset and saved. A, E

132 EVENT LOG CLEARED The event log has been erased. A, E

133 HIST LOGS CLEARED Both History Logs have been erased. A, E

134 HIST LOGS FULL Both History Logs have been written and no more history logs

Input Contact # x is an optional alarm input. The alarm name
can be programmed with an alarm name from the Input
Contactor Isolator settings option under the Comm Options.
See Configuring the Input Contact Isolator Settings on
page 95. The alarm is sent to Monitor DSP. The LCD logs the
alarm with the programmed name. Monitor DSP logs it with the
generic name which is how it is reported to the SVT query.

saved.

can be written without clearing one of the logs.

A, E

A, E

A, E

75

12.0 COMMUNICATION INTERFACES

The Liebert STS2 monitoring system offers several choices for communications.

The RS-232 terminal port is standard on all units. The port is located inside the front door, to the left
of the touch screen/LED front panel mounting as shown in Figure 28. This port is primarily used as
an alternate user interface to configure, control, and diagnose the system, especially for systems that
do not include the HMI touch screen. Commands for the RS-232 port are shown in Table 9.

Several other communications options are also available. Those options are located a Communica­tions compartment to the right of the touch screen/LED front panel and are accessible when the front
panel door is open. See Figures 21 and 22 for the location of the communications options.

Connections to the communication ports are made by wiring to terminal boards located in the Com­munications compartment. The communications options listed below reference the control wiring
drawing for each option.

• Liebert IntelliSlot Web/485 Card With Adapter (IS-WEB485ADPT) (optional)— the card provides
connectivity to any TCP/IP-based Ethernet network to allow the device to communicate with net­work management systems (NMS) via SNMP. Events can be transmitted to the NMS to provide
remote status monitoring, plus fault and alarm detection. The card includes an RJ-45 port for an
Ethernet connection, via Category 5 cable.

The Liebert IS-WEB485ADPT can also integrate the system with an existing Building Manage­ment System (BMS) or out-of-band monitoring, using Modbus, a standard multi-drop protocol.
The card has redundant communication paths that make it possible to connect to a BMS using
Modbus while simultaneously communicating to an NMS through SNMP.

See Figure 27 for more information on the Liebert IS-WEB485ADPT. If you have questions
about the card, refer to the user guide, SL-52615, available at Liebert’s Web site,

www.liebert.com

• Input Contact Isolator (ICI) Board (optional) — provides an interface for up to eight user inputs.
External messages and alarms can be routed to the unit, via the ICI.

See Configuring the Input Contact Isolator Settings on page 95 for instructions on config­uring the connections. See Figure 25 for wiring details.

• Programmable Relay Board (PRB) (optional) — up to two PRBs can be installed in the Liebert
STS2 to route Liebert STS2 events to external devices.

See Configuring the Programmable Relay Board Settings on page 97 for default settings
and instructions for reconfiguring the relays. See Figure 24 for wiring details.

• Comms Board (optional) — includes a terminal block to provide a DTE connection to an external
modem. This board also provides a direct connection to a Liebert SiteScan terminal, via an
RS-422. Liebert SiteLink-12 or Liebert SiteLink-4 is required for Liebert SiteScan to communi­cate with the Liebert STS2. See Figure 26 for wiring details.

Communication Interfaces

Data link requirements are Full Duplex Asynchronous RS-232 format.

Communications options are also discussed in 6.0 - Options.

12.1 Using the RS-232 Port

The RS-232 port is configured with a baud rate of 9600 with 8 data bits, 1 stop bit, no parity, and no
hardware handshaking.

76

12.1.1 Connecting and Using a Terminal

An RS-232 connection can be used to connect the Liebert STS2 to either a terminal or a PC running
terminal emulation software. If you are unsure of the cable pin out, see 15.2.10 - Terminal Port
Connections.

1. Connect the terminal to the Liebert STS2 by plugging the cable from the terminal into the RS-232
port.

This connection can be made at any time.

2. After making the connection, verify the communications link by pressing <ENTER> on the
terminal keyboard.

The interface communications system responds as indicated below:

Repeating command -->
Illegal command!
<?> or <HELP?> displays the RS-232 command set
<?> <command> or <HELP?> <command> displays specific help for the command
SVTP-Control >

The SVTP-Control > prompt indicates that RS-232 communications are established.

• If you receive no response or prompt, verify that the connector is properly plugged into the
port and the PC or terminal serial interface is working properly.

3. Enter the desired commands, as listed in Table 9.

For additional help type <?> <command> or <HELP?> <command>

Communication Interfaces

Refer to the corresponding menu options in the 13.0 - Liebert STS2 Touch Screen Display for
more details about the commands.

Some terminal commands require a password to function. Use the PWD command and a valid pass­word to gain access.

Table 9 Terminal commands

Keys Function

? Displays this help menu or specific help with a command

AA? Displays active alarms

AF? Displays active faults

CEL Clears the event log

CHL Clears the history logs

DATE? Displays current system date

DATE Sets system date

EL? Displays the entire event log

HELP? Displays this help menu or specific help with a command

HLn? Displays the history log #n, if frozen

LOGOUT Logs user out of unprotected mode

PS? Displays the preferred source

PS n Sets the preferred source to #n

PWD Allows users to access protected commands

QUIT Modem only. Ends the session and hangs up the modem.

SH Silences the horn

SPT? Displays all current setpoints

SPTx Displays current setpoints for group x. See 12.1.2 - Configuring the Liebert STS2 via

SR? Displays status reports

TIME? Displays current system time

TIME Sets system time

the Terminal for a description of groups.

77

Table 9 Terminal commands

Keys Function

UPMDR? Displays metering data

VER? Displays firmware versions

12.1.2 Configuring the Liebert STS2 via the Terminal

The SPT command is used to configure the systems setpoints. The SVT syntax for the setpoints con­sists for four parameters:

SPT [group] [item] [value]
where the parameters are:

• SPT — is the terminal command that is used to configure setpoints.

• group — the group under the setpoint command which contains the desired settings.

• item — the item number within the selected group.

• value — the desired value for this item.

Only the specific options words listed in this section use a hexadecimal value. Other settings, depend­ing on what they are, use other input types. For example, System ID uses a text string, nominal volt­ages and currents use standard numeric integers, and modem baud rate uses an enumeration where
0 = 2400, 1 = 9600, & 2 = 19200 bps.

NOTE

Spaces are placed between each parameter, but not between characters or numbers in a
parameter. Using an underline here to represent a space, an example of a the syntax is:
SPT_2_6_0081. 0081 is the value parameter.

Communication Interfaces

This section provides instructions for setting these parameters, with an example of building an SPT
command for System and User settings.

Groups Parameter

The setpoints are grouped for ease of configuration. For example, Event Masks are Group 4 and Sys­tem Settings are Group 2. The numbers shown below are entered for the group parameter. For exam­ple, start of a System Settings command is SPT 2.

The group parameters are:

1 = System Ratings
2 = System Settings
3 = User Settings
4 = Event Mask Settings

For example, the start of a System Settings command is SPT 2, where SPT is the system setpoints
command and 2 is the group parameter for System Settings.

See 12.1.4 - Setting Event Masks with the Terminal on page 83 for instructions on configuring
Event Mask parameters.

Item Parameter

Each setting within the group is indexed by an item number as shown below in Table 11. These item
numbers are also displayed on the terminal when you list the configuration setting for a particular
group.

Continuing with the example, to configure an Options_1 setting under System Settings, the command
would begin with SPT 2 6
where 6 is the value Options_1. Note the space between each parameter.

78

Communication Interfaces

Value Parameter

Item settings, depending on what they are, use various value types. Table 10 provides a list of the
possible value types and their description.

Table 10 Value types

Type Definition

Numeric An integer numeric value in the units indicated by the item name. For example, a System Voltage

Scaled Similar to the Numeric, this value type is an integer that has been scaled, usually to remove

String Certain settings are represented by alphanumeric character strings, such as setting the System

Enumeration This type uses an indexed list to represent possible choices. One example is the Modem Baud

Bit-packed This type of value uses a hexadecimal binary word, where each of the sixteen bits in the word has

Event Masks This type is a specially formatted and is used to customize the behavior of each fault and alarm in

Rating of 480 would indicate 480 volts.

decimal points that would normally appear within the value. In this case, a value of 2.5 may actually
be input as simply 25. For all Scaled types, the scaling appears in Table 11.

Model Number to Liebert STS2.

Rate which uses a value of 0 to select 2400 bps, 1 for 9600 bps, and 2 for 19200 bps.

the value of 1 (True) or 0 (False). Although somewhat difficult to use, it packs a large amount of
data within a single entry. A detailed description of this type appears in section 12.1.3 - Setting
Bitpacked Options with the Terminal on page 81.

the system. See 12.1.4 - Setting Event Masks with the Terminal on page 83 for instructions on
configuring Event Mask parameters.

Table 11 shows the various groups, the settings contained within, and the type of value it requires.

Table 11 Group settings and values

Group Item: Description Value Type Value Notes

1 Input Volts (PDU) Integer Set per system spec.

Group 1:
System
Ratings

Group 2:
System
Settings

Group 2 11 Modem Init String String 20 Character max.

(cont.) 12 Modem Baud Rate Enumeration 0 = 2400, 1 = 9600, & 2 = 19200 bps

2 Volts Integer Set per system spec.

3 Current Integer Set per system spec.

4 Frequency Scaled Desired freq. x 10 (600 = 60 Hz)

1 Language Enumeration [Not supported at this time]

2 System Model Number String 14 Character max.

3 System ID Number String 8 Character max.

4 System Tag Number String 8 Character max.

5 System Order Number String 8 Character max.

6 Options_1 Bitpacked 14 Character max.

7 Autodial Primary Line String 20 Character max.

8 Autodial Secondary Line String 20 Character max.

9 Autodial Pager Number String 20 Character max.

10 Autodial Pager PIN String 10 Character max.

13 Modem LGS Check - Day Bitpacked

14 Modem LGS Check - Time Bitpacked

15 Comms Options 1 Bitpacked See section 12.1.3.

16 Comms Options 2 Bitpacked See section 12.1.3.

79

Table 11 Group settings and values (continued)

Group Item: Description Value Type Value Notes

SCR1 Fast Undervoltage

Group 3:
User
Settings

Group 4:
Event Mask
Settings

1

Setpoint

SCR1 Slow Undervoltage

2

Setpoint

SCR1 Slow Undervoltage

3

Detect Delay

SCR1 Overvoltage

4

Setpoint

SCR1 Overvoltage Detect

5

Delay

SCR1 I peak Transfer

6

Setpoint

SCR2 Fast Undervoltage

7

Setpoint

SCR2 Slow Undervoltage

8

Setpoint

SCR2 Slow Undervoltage

9

Detect Delay

SCR2 Overvoltage

10

Setpoint

SCR2 Overvoltage Detect

11

Delay

SCR2 I peak Transfer

12

Setpoint

Max. Transfer Phase

13

Angle

Output Frequency

14

Deviation

15 ReTransfer Delay Time Integer In seconds

16 Horn Volume Integer Range: 1-10

17 Critical Option Enabling Bitpacked See section 12.1.3.

Non-Critical Option

18

Enabling

1 to 63Event Mask settings for

faults

64 to
143

Event Mask settings for
alarms

Integer In % of nominal below nominal

Integer In % of nominal below nominal

Integer In number of lines cycles

Integer In % of nominal above nominal

Integer In 1/4 lines cycles

Integer x 10

Integer In % of nominal below nominal

Integer In % of nominal below nominal

Integer In number of lines cycles

Integer In % of nominal above nominal

Integer In 1/4 lines cycles

Integer x 10

Integer In degrees

Integer Freq. in Hz x 10

Bitpacked See section 12.1.3.

Event Mask See section 12.1.4.

Event Mask See section 12.1.4.

Communication Interfaces

80

12.1.3 Setting Bitpacked Options with the Terminal

Five sets of options and features settings are available through the terminal to control the system
operation.

Under System Settings for the SPT command, these items denote which options are INSTALLED:

• 6 — Options_1

• 14 — Comms Options 1

• 15 — Comms Options 2

Under User Settings, for the SPT command, these items denote which features are ENABLED:

• 17 — Critical Option Enabling

• 18 — Non-Critical Option Enabling

The value parameter settings are in the form of a bit-packed word (in hexadecimal notation). In other
words, each bit indicates a particular setting for the option or feature. The bit assignments for the
options and features are as follows:

Options_1

bit0 — HasDualOutputBreaker
bit1 — HasPDU
bit2 — Has4PoleTransferSwitch
bit3 — HasShuntTrip
bit4 — HasWyeOutputXfmr
bit5 — HasExternalPrecisionTimeSource
bit6 — HasSFA
bit7 — HasRemoteSourceSelect
bit8 through bit15 — not used (set to 0)

Communication Interfaces

Comms Options 1

bit0 — HasIntModem
bit1 — HasExtModem
bit2 — HasNIC
bit3 — not used (set to 0)
bit4 — HasSiteScan
bit5 — not used (set to 0)
bit6 — not used (set to 0)
bit7 — HasOpenCommsDigitalInputBrd
bit8 — HasOpenCommsDigitalOutputBrd_1
bit9 — HasOpenCommsDigitalOutputBrd_2
bit10 — HasRemoteStatusPanelBrd_1
bit11 — not used (set to 0)
bit12 — not used (set to 0)
bit13 — not used (set to 0)
bit14 — EnableDialIn
bit15 — EnableDialOut

Comms Options 2

bit0 — EnablePager
bit1 — EnableOCDINormallyClosed
bit2-3 — OCDO1Assignment (0=User Defined, 1=Standard Set or 2=AS400)
bit4-5 — OCDO2Assignment (0=User Defined, 1=Standard Set or 2=AS400)
bit6 through bit15 — not used (set to 0)

81

Communication Interfaces

Critical Option Enabling

bit0—EnableManual_IPeakReset
bit1—EnableAutoRestart
bit2 through bit15 - not used (set to 0)

Non-Critical Option Enabling

bit0 — EnableAutoReXfer
bit1 through bit15 — not used (set to 0)

The bits are set in reverse order, from bit 15 on the left to bit 0 (zero) on the right. The bits are
grouped in four sets of four bits each, as such:

0000 0000 0000 0000

|................................|

bit 15.........................bit 0

Since each bit represents a setting, a bit can be enabled or disabled:

• 1 = installed option or enabled feature
– or –

• 0 = option not installed or feature not enabled

Enabling or disabling the bits in each group creates a binary value for that group. For example, if the
fourth bit in a group is set to 1, the group group’s binary value is 0001.

Each group is translated into a hexadecimal equivalent. The group with the value of 0001 has a hex
equivalent of 1.

You can use this table to help with the conversion:

Table 12 Binary-hexadecimal conversions

Hex

Binary value

0000 0 A 1010

0001 1 B 1011

0010 2 C 1100

0011 3 D 1101

0100 4 E 1110

0101 5 F 1111

0110 6

0111 7

1000 8

1001 9

Equivalent Binary value

Hex

Equivalent

The hex value for each group is entered in the command as four digits.

To summarize the procedure:

1. Set each bit position.

2. Convert the binary value each group into its hex equivalent.

3. Enter the hex values for each group, in order, into the command for the value parameter.

The following example explains how the conversion is completed.

82

Putting the Terminal Command Together

For example, a unit only has the Remote Source Selection and Dual-Output Breaker options installed.

Checking the bits list under Options_1 on page 81, bits 7 and 0 each must be set to 1 to indicate
that these options are installed.

The bit setting is as follows, starting with bit 15 on the left and going down to bit 0:

0000 0000 1000 0001

With the bits combined in groups of four, the binary settings can be translated into hexadecimal val­ues.

The first two groups in the sample equal zero (0). In the third group, 1000 in binary translates to 8 in
hex. In the fourth group, 0001 in binary translates to 1 in hex.

In hex this equates to (digits in the value parameter cannot have spaces between them):

0081

So your command to indicate that the Remote Source Selection and the Dual-Output Breaker are
installed would be:

SPT 2 6 0081

12.1.4 Setting Event Masks with the Terminal

The event masks can be customized via a terminal. The command SPT4?<ENTER> displays all faults
and alarms, along with their associated event masks. A plus sign (+) means that particular event
mask is enabled, while a minus sign (-) means that mask is disabled.

Communication Interfaces

Refer to 11.1 - Event Mask on page 71 for more information on event masks and their associated
flags.

Unlike the System and User Settings, mask values are set by designated letters, not hex values. How­ever, as with other RS-232 interface settings, four parameters are passed. See 12.1.2 - Configuring
the Liebert STS2 via the Terminal on page 78 for more details about the parameters.

The syntax for configuring event masks is:

SPT 4 ID ±D±L±S±E±A

• SPT — is the terminal command used to configure setpoints.

• 4 — setting (group parameter) for event masks, under System Settings.

• ID — event ID. The ID is the item parameter for this command. The ID numbers for each event
are listed with the events in Table 8 on page 74.

• D,L,S,E,A — the event masks: Dial, Latch, Summary, Event log, and Audible. The masks are the
value parameter for the command.

Each mask type must be preceded by a plus sign (+) to enable it, or a minus sign (-) to disable it.

NOTE

NO spaces are placed between each mask listed above.

Only the mask that is passed (enabled) is applied when the event occurs.

Note that the Summary and Event Log event masks are only configurable for the LED units.

To set the event masks for a particular event:

1. Enter the command. Examples and descriptions are provided below.

2. Press ENTER.

After the new settings are entered, the new results for that event ID are displayed.

83

Communication Interfaces

Examples of Event Mask Settings

• To latch event #001, S1 SCR SHORT, use SPT 4 1 +L.

• To disable event #128, CONFIG MODIFIED, from sounding the horn, use SPT 4 100 -A.

• To enable event #012, OUT VOLT SENSE FAIL, to Dial and go into the Event Log, use
SPT 4 12 +D+E.

• To disable all masks for event #120, INPUT CONTACT #1, use SPT 4 120 -D-L-S-E-A.

To breakdown this syntax for the last example:

• SPT — SVT command

• 4 — group parameter, identifying System Setting group under which the Event Mask settings
reside.

• 120 — item parameter. In this command, that is the event ID.

• -D-L-S-E-A — value parameter. In this case, the minus sign (-)disables all masks for the INPUT
CONTACT #1 event.

84

13.0 LIEBERT STS2 TOUCH SCREEN DISPLAY

The Liebert STS2 can be configured with a Color Graphical LCD touch screen that allows you to
quickly check the status of the unit and identify problems.

A touch screen LCD is available through the front of the Liebert STS2. This screen provides a graphi­cal (Mimic) display of the switch’s operation, plus system information including system parameters,
alarms and faults.

The LCD provides a color, back-lit touch screen as a user interface. In addition to the Mimic and the
system parameters, the screen provides a series of menus to allow you to configure the Liebert STS2,
including the control of the preferred source, auto/manual retransfer selection, alarm notification,
and other system setpoints. The touch screen also provides buttons to reset alarms and turn off audi­ble alarms, such as a horn.

13.1 Display Overview

The Liebert STS2 Color Graphical Display provides three areas of information, plus buttons and a
series of menu choices.

The Color Graphical Display contains the following features:

• Mimic — a graphical diagram of the status of the unit.

• Event controls — allow you to reset alarms and turn off audible alarms.

• Event Display — displays any active alarm or fault condition, in real-time.

• Menus — provide choices and configuration settings in dialog boxes or information in the display
panel.

• Display panel — provides additional information, depending on the menu choice that was last
selected. This information includes event help text, and startup and bypass procedures.

Liebert STS2 Touch Screen Display

Figure 48 Liebert STS2 touch screen display

Mimic

Event Controls

Event Display

Display Panel

Menu Options

85

13.2 Menu Overview

The touch screen menu provides access to configuration settings and more device information.

The CONFIG (Configuration) and LOGS menus provide multiple choices through pop-up menus. The
SOURCE XFER menu selection allows you to select the preferred source. The other menu choices pro­vide information in the display panel. The menu choices are discussed later in this manual.

All programmable functions are preset at the factory to default settings. These settings enable the
unit to be brought up without the need to enter all selectable parameters. The menus allow the set­tings to be customized.

Figure 49 Menus

Liebert STS2 Touch Screen Display

Config menu

System Rating

Event Masks

User Settings

System Settings

NOTE

Some menu choices display a keyboard or keypad on the touch screen. Enter data on the
touch screen.

Click OK to save the data that you have entered.

Use the back arrow button (<-) to delete unwanted characters. This button functions like
a backspace key on a keyboard.

Figure 50 Keyboard and keypad displays

Logs

Event Log

History Log 1

History Log 2

Comm Options

System Options

System ID

Backspace

Backspace

86

13.2.1 Security

Because the Liebert STS2 Color Graphical Display provides access to various configuration and mon­itoring choices, a password or key lockout switch may be used to protect access to certain changes,
including:

• Change configuration settings.

•Clear logs.

• Make a source transfer.

• Reset an alarm.

Without entering the password or enabling changes with the key lockout switch, you still can:

• View the display, including the mimic, status and event help.

•View logs.

• View the startup and bypass procedures.

• Use the SILENCE button to turn off the audible alarm.

Using the Optional Key Lockout Switch

An optional key lockout switch for the Liebert STS2 enables or disables the ability to make changes
on the Liebert STS2. The key lockout switch is mounted on the front door. See Figures 8 through 10
for location of the key lockout switch.

• To disable the changes, turn the key to the top of the switch, toward the closed padlock.

• To enable changes turn the key to the horizontal position, toward the open padlock.

Liebert STS2 Touch Screen Display

Figure 51 Key lockout switch.

Using the Password

If the unit is not equipped with a keylock, a password is required when you attempt to:

• Save changes in the CONFIG menu choices.

• Transfer sources.

• Reset active alarms.

•Clear logs.

When a password is requested, a keyboard is displayed on the touch screen. After you enter the pass­word, select OK.

The password is case-sensitive. Password access times out after ten (10) minutes, and must be
re-entered to save changes. The time-out period cannot be changed.

To set or reset the password:

1. Select SYSTEM SETTINGS from the CONFIG menu.

2. Select SYSTEM ID form the SYSTEM SETTINGS menu.

3. Click PASSWORD.
A keyboard is displayed.

4. Enter a password.
The password must be four (4) alpha-numeric characters and is case sensitive.

5. Click OK.

Changes disabled

Changes enabled

87

13.3 Mimic Display

The Mimic display provides a color diagram of the operation of the Liebert STS2. This display imi­tates the power flow through the static transfer switch and indicates source status, breaker status,
switch status, source voltage and current readings, output power measurements, and active alarm
messages. See Figure 48 on page 85.

13.4 Event Controls

The Liebert STS2 detects events when certain thresholds are passed or certain problems occur. The
alarm controls allow you to acknowledge the existence of these events.

• RESET — All latched events whose conditions have cleared are removed from the Event Display.
Faults and alarms that remain active, or are not recoverable, are not affected when this button is
selected. This button is also used to perform manual I-Peak resets and manual retransfers.

• SILENCE — turns off the audible alarm (horn or beeper) without resetting the triggering event.
This setting does not permanently turn off the horn. The alarm sounds again when the next event
with an audible alarm setting is triggered.

Active events are shown in the Event Display, whereas cleared events can be reviewed via the Event
Log.

13.5 Event Display

The Event Display lists the condition of the Liebert STS2 in real-time. Both nominal system parame­ters and alarm messages are displayed in the Event Display. You can touch any message in the Event
Display to display more information in the Display Panel to the left. The selected status is displayed
in bold type.

Liebert STS2 Touch Screen Display

13.6 Menu bar

As previously mentioned, the menu bar provides both configuration choices and information. The
choices under the Config and Log menus access additional dialog boxes, while the other menu choices
only show information in the display panel.

13.6.1 Configuration Menu

When you select the CONFIG (Configuration) menu choice, a pop-up menu is dis­played with four choices.

•System Ratings — used to configure frequency, voltage and currents settings for
the Liebert STS2.

•Event Mask — allows you to configure system’s response for events.

•User Settings — allows you to configure operations for the Liebert STS2.

•System Settings — accesses another pop-up menu to configure communication and
system choices and the system ID.

Each of these choices accesses a separate dialog box.

System Ratings

The System Ratings menu is used to set the nominal line frequency, nominal voltage and nominal
current at which the system operates when it is installed. These settings are configured when the sys­tem is initialized at the factory or under maintenance and should not be changed by the user.

Event Masks

The Liebert STS2 gathers, processes and reports faults and alarms, collectively referred to below as
events. The Event Mask dialog box allows you to set the system’s response for specific alarms and
faults that are generated. See 11.0 - Alarm and Faults for more information on events and 11.1 -
Event Mask for the definitions of the Event Mask types.

88

To set the event masks:

1. Access the Event Mask dialog box:
a. Select CONFIG.
b. Select EVENT MASK from the pop-up menu.
The Event Mask dialog box is displayed. See Figure 52.

2. Select the mask settings for each fault and alarm.
a. Select YES to enable the setting,

– or –

b. Select NO to disable the setting.

3. Select SAVE to keep the settings.

Figure 52 Event mask dialog box

Liebert STS2 Touch Screen Display

User Settings

The User Settings choice allows you to adjust the user-accessible switch settings. Access is limited to
qualified personnel via system security.

To access the User Settings dialog box:

1. Select CONFIG.

2. Select USER SETTINGS from the pop-up menu.

The User Settings dialog box is displayed. See Figure 53. The top six buttons access a series of sec­ondary dialog boxes to configure the various settings.

89

Figure 53 User settings dialog box

Liebert STS2 Touch Screen Display

Source Set Points

The Source 1/2 Set Points allows you to configure trigger points for each input source (1 or 2) for the
Liebert STS2 via a keypad dialog or HI/LO dialog box. The source numbers do not designate the
source as the preferred or alternate source. The numbers simply identify the input source. See 10.2 -
Manual Transfer / Preferred Source Selection to set the preferred source.

The Set Points are based on values in relation to the nominal voltage required for the Liebert STS2.
UV refers to under voltage, meaning the amount of voltage below the nominal voltage. OV refers to
over voltage, or the amount of voltage over the nominal voltage.

• Fast UV Setting (%) — if the voltage drops below this set percentage of the nominal voltage, the

Liebert STS2 transfers from the current source to the opposite source.

• Slow UV Setting (%) — if the voltage remains this set percentage below the nominal voltage for

the period of the slow detection delay, the Liebert STS2 transfers from the current source to the
opposite source.

• Slow UV detection delay — the number of cycles that the source must remain below the Slow UV

Setting before the Liebert STS2 transfers.

• OV Setting (%) — if the voltage exceeds this set percentage of the nominal voltage for the period of

the OV detection delay, the Liebert STS2 transfers from the current source to the opposite source.

• OV Detection Delay — the number of cycles that the source must remain above the OV Setting

before the Liebert STS2 transfers sources.

• I-PK Xfer Lockout — if current from the source exceeds this threshold, the Liebert STS2 disables

source transfers, and has to be reset either manually or automatically. The type of reset is config­ured under the User Settings.

90

To configure the setpoints for each source:

1. Select SOURCE 1/2 Set Points from the User Settings dialog box.
The Source 1/2 Set Points dialog is displayed.

Figure 54 Source setpoints

Liebert STS2 Touch Screen Display

2. Select 1 to configure the settings for Source 1.

3. Configure the settings using the keypad or dialog box that is displayed when you touch a button.

Table 13 Sepoint parameters

Button Range Default Comments

Fast UV Setting (%)

Slow UV Setting (%) -5 to -20% -10% Set in increments of 1%.

Slow UV detection delay 1-60 cycles 5 cycles Units: Line Cycle

OV Setting (%) +5% to +20% +10% Set in increments of 1%.

OV Detection Delay 1-255 cycles 3 cycles Units: 1/4 Line Cycle

I-PK Xfer Lockout

-10 to -30% of Nominal
voltage rating

0 – 3.0 multiplied by
the unit current rating.

-20% Set in increments of 1%.

1.5 * Unit
Current Rating

I-peak xfer lockout detection point.
Units: Amps RMS. Select the HI or LO
buttons to configure your setting.

4. Select 2 for Source 2.

5. Configure the settings, as described in Step 3.

6. Select SAVE to keep the settings for both sources.
The Set Points dialog is closed and the User Settings dialog is displayed.

7. Select MANUAL MAX XFER PHASE ANGLE.
A keypad is displayed.
This setting configures the maximum allowed phase difference between the sources and applies to

all manual transfers as well as any auto retransfer.
a. Configure this setting with a range of ± 1-30 degrees.

The default setting is ±15 degrees and the resolution is 1 deg.
b. Select OK to save the setting.
The setting is now displayed in the adjacent field in the User Settings dialog box.

91

Liebert STS2 Touch Screen Display

8. Select FREQUENCY TRIP POINT.
A keypad is displayed.
This choice verifies that the source is running at the proper frequency. This choice sets the fre-

quency deviation in the frequency that triggers the frequency trip point alarm. The frequency
deviation setting is the allowable frequency variation from nominal (60.0 or 50.0 Hz) before acti­vating the frequency deviation alarm. The frequency setting applies to both input sources.

a. Configure this setting with a range of 0.1 – 3.0 Hz

The default setting is 3 and the resolution is 0.1.

b. Select OK to save the setting.

9. Select RETRANSFER DELAY.
A keypad is displayed.
With the secondary source being used, this setting sets the length of time the switch waits until

attempting to transfer back to the preferred source.
a. Configure this setting with a range of 1 to 60 seconds.

The default setting is three (3) seconds and the resolution is 1 second.
b. Select OK to save the setting.
The setting is now displayed in the adjacent field in the User Settings dialog box.

10. Select AUDIO LEVEL.
A dialog box is displayed with HI and LO settings.
This choice sets the loudness of the horn or beeper that is sounded for audible alarms.
a. Configure this setting with a range of 1–10 (ten).

The default setting is 5. The settings have an increment of 1 (one).
b. Select OK to save the setting.
The setting is now displayed in the adjacent field in the User Settings dialog box.
You can select TEST to briefly sound the alarm to judge its volume.

11. Select DISPLAY BRIGHTNESS.
A dialog box is displayed with HI and LO settings.
This choice sets the brightness for the touch screen.
a. Configure the Contrast and Brightness settings with a range of 1 – 10 (ten).
b. Select OK to save the settings.

12. Set the AUTO REXFER ENABLE choice.
The auto retransfer enable setting determines whether the switch automatically returns the pre-

ferred source after that source is restored.

• Select YES to enable the automatic transfer.

• Select NO to disable the automatic transfer. The setting requires transfers be done manually.

13. Set the AUTO RESTART ENABLE choice.
This setting determines whether the Liebert STS2 can be started automatically when power is

restored after it has been lost.

• Select YES to enable the automatic restart.

• Select NO to disable the automatic restart. This settings requires a manual restart of the Lie­bert STS2.

14. Select a setting for the I-PEAK RESET.

• Select AUTO to configure the static transfer switch to automatically reset when a fault clears
and the voltage and current are normal.

• Select MAN to require a manual reset of the static transfer switch when fault clears and the
voltage and current are normal.

• The default setting is Manual.

CAUTION

!

Risk of equipment damage and personnel injury.
Use of Auto Restart is site specific. Do not enable auto restart unless the infrastructure is
designed for unattended operation and there is no chance of equipment or personnel harm by

automatic re-energizing of the system.
Consult with your Liebert site Engineer as to whether Auto restart should be enabled.

92