Liebert 1000A User Manual

AC Power
For Business-Critical Continuity™

Liebert® STS2

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 Transfer Inhibit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

6.12 Input Junction Boxes and Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

6.13 Seismic Floor Anchors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

6.14 Seismic Floor Stand . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

®

SNMP/Web/Modbus 485 Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

9.2.1 Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

9.2.2 Circuit Breakers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

9.2.3 SCRs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

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 Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

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

13.7 Configuration Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

13.7.1 System Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

13.7.2 Event Masks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

13.7.3 User Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

13.7.4 System Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

13.8 Comm Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

13.8.1 Configuring the Modem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94

13.8.2 Configuring Pager Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

13.8.3 Configuring the Input Contact Isolator Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96

13.8.4 Configuring the Programmable Relay Board Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97

13.8.5 Configuring the Liebert IntelliSlot SNMP/Web/Modbus 485 Card . . . . . . . . . . . . . . . . . . . . . 98

13.8.6 Liebert SiteScan

13.8.7 Saving Your Communications Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99

13.9 System Options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99

13.10 System ID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100

13.11 Logs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101

13.11.1 Event Log . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101

13.11.2 History Log . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101

13.12 Source Transfers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102

13.13 Startup Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102

13.14 Bypass Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102

13.15 Help . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102

13.16 Logo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102

13.17 Cleaning the LCD Touch Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102

®

Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99

iii

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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106

14.2.1 Normal System Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106

14.2.2 Manual Transfer / Preferred Source Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107

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

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 M

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

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

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

AINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .138

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

ROGRAMMABLE RELAY BOARD SETTINGS RECORD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .140

P

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 Liebert STS2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 SNMP/Web/Modbus 485 card. . . . . . . . . . . . . . . . . . . . 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

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

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

v

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 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.

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

The Liebert STS2 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 startup 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, needed when calling Emerson for technical 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 bypass 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

terminal 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 Emerson contact information for technical support.

2

1.0 SAFETY PRECAUTIONS

!

!

Read this manual thoroughly before working with the Liebert STS2.

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 Liebert STS2 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 Liebert STS2. 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
STS2, 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 Emerson Network Power Liebert Services at 1-800-543-2378 or your
local Emerson representative 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 STS2 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 under the following environmental conditions:

• Storage Temperature Range: -40° to +80°C (-40° to 176°F).

• Operating Temperature Range: 0° to 40°C (32° to 104°F).

• Relative Humidity: 0 to 95% without condensation.

• Operating Altitude: Up to 4000 ft. (1200m) above sea level without derating.

Above 4000 ft. (1200m), output current is derated by 6% per 1000 ft. (18% per 1000m).

• Storage/Transport Altitude: Up to 40,000 ft. (12,200m) above sea level.

• Audible Noise: Less than 55 dBA at 5 ft. (1.5m) with audible alarm off.

6

3.4 Altitude

0

10,000

(3048)

9500

(2896)

9000

(2743)

8500

(2591)

8000

(2438)

7500

(2286)

6000

(1829)

5500

(1676)

7000

(2134)

6500

(1981)

5000

(1524)

4500

(1372)

4000

(1200)

100

86

88

90

92

94

96

98

Rating (%)

Altitude, Feet (M) Above Sea Level

0

10,000

(3048)

9500

(2896)

9000

(2743)

8500

(2591)

8000

(2438)

7500

(2286)

6000

(1829)

5500

(1676)

7000

(2134)

6500

(1981)

5000

(1524)

4500

(1372)

4000

(1200)

104.0 (40)

86.0 (30)

87.8 (31)

94.1 (33)

93.2 (34)

95.0 (35)

96.8 (36)

98.6 (37)

Maximum Ambient

Temperature, °F (°C)

Altitude, Feet (M) Above Sea Level

102.2 (39)

100.4 (38)

89.6 (32)

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

Figure 1 Recommended derating for high altitude operation

Location Considerations

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

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

K2

K1

K1 K3K2 K3 CB4

CB5

CB2

CB3

STS2STS1

OUTPUT

CB1

SOURCE 1

SOURCE 2

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

Power and Control Wiring

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
STS2.

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

!

SOURCE 2

K1 K3K2 K3

K2K1

225A 225A 225A

225A225A 225A

CB4 CB5

CB2

CB3

STS2

STS1

CB1

SOURCE 1

MICB2MICB1

ISOLATION
TRANSFORMER

ISOLATION
TRANSFORMER

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 Liebert STS2

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 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 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 Liebert STS2’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 96 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, a site monitoring product
and/or an external modem. Liebert SiteLink
SiteScan to communicate with the Liebert STS2.

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.

™

-12 or Liebert SiteLink-4 is required for Liebert

6.6 Liebert IntelliSlot® SNMP/Web/Modbus 485 Card

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

The Liebert SNMP/Web/Modbus 485 card 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/Web (HTTP). A terminal block provides the connection to
Modbus.

See Figures 21 and 22 for the location of the Liebert SNMP/Web/Modbus 485 card. See Figure 27
control wiring information.

If you have questions about the Liebert SNMP/Web/Modbus 485 card, refer to the user guide,
SL-52615, available at the Liebert 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.

6.11 Transfer Inhibit

Transfer Inhibit prevents the Liebert STS2 from transferring under certain conditions. When a
customer-supplied closed dry contact is provided, the Liebert STS2 will not transfer and remain on its
present source even if the source is no longer supplying power.

This option requires an Input Contact Isolator board (see 6.4 - Input Contact Isolator Board).

16

6.12 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.

6.13 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.

6.14 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

PS211100
Rev. 03

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.

30"

(762)

32.1"
(815)

36.7"
(932)

77"

(1956)

18.8

(477)

19.2"
(488)

24.4"

(620)

13.5" (343)

12.8" (326)

5.1

(130)

29.8"
(756)

2.75"

(69.8) typ.

Leveler

Center

Of Gravity

Center

Of Gravity

DETAIL A

Front of Unit Without Side Panel

23.4" (594)

Caster Centers

29" (736)

(12mm centers)

21.6"
(548)

Caster

Centers

8.4 (213)

11. 1

(280)

4.6 (116)

21.5 (546)

24.4

(619)

.47" (12)

centers

.47" (12) dia.

threaded mounting

hole; 4 typ.

see Note 10

9.4 (238)

Figure 5 Outline drawing: 100 – 250 amp Liebert STS2

Installation Drawings

18

Figure 6 Outline drawing: 400 – 600 amp Liebert STS2

Installation Drawings

PS211400

Rev. 02

19

Figure 7 Outline drawing: 800 – 1000 amp Liebert STS2

PS211800

Rev. 02

Installation Drawings

20

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

PS211101
Rev. 02

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.

Installation Drawings

21

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

Installation Drawings

PS211401

Rev. 02

22