Utility Relay Company AC-PRO-II Instruction Manual

Download

A C -P R O -II

I-AC-PRO-II

AC TRIP UNIT

IN STRU C TIO N m A N UA L

TATE OF THE ART TECHNOLOGY FOR LOW

VOLTAGE CIRCUIT BREAKER RETROFITTING

Chagrin Falls, OH 44023 Phone: 888.289.2864 www.utilityrelay.com

AC-PRO-II® Instruction Manual www.utilityrelay.com

Table of Contents

Manual Revision 1.4

Section: Page

1.0 Introduction and Product Overview .......................... 3

1.1 Current Protection and Functions...................... 3

1.2 Voltage and Power Features - optional Voltage

Divider Module (VDM) ...................................... 3

1.3 Additional Features ........................................... 3

2.0 UL/ULC Classification & CE Mark ............................. 4

3.0 Trip Unit Power .......................................................... 4

3.1 Current Transformer (CT) Power ...................... 4

3.2 Battery Power ................................................... 4

3.3 USB Power ....................................................... 4

3.4 24VDC Auxiliary Power..................................... 4

3.5 Voltage Divider Module (VDM) Power (option) .. 4

4.0 AC-PRO-II® Pictures and Configurations .................. 5

5.0 External Connections ................................................ 8

5.1 Breaker Wiring Harness .................................. 11

5.1.1 Ground Fault Wiring Configurati ons .... 11

5.2 QUICK-TRIP® Connector ................................ 11

5.3 Auxiliary Connections ..................................... 11

5.3.1 Configurable Alarm Relay ................... 11

5.3.2 Ground Fault Defeat Input ................... 12

5.3.3 URC Breaker Position Switch .............. 12

5.4 RS-485 Communications Terminal Block ........ 12

5.5 24VDC Auxiliary Power................................... 12

5.6 USB Port ........................................................ 12

5.6.1 USB Extension cable .......................... 12

5.6.2 USB Extension Cable Installation ........ 13

5.7 VDM Connections (optional) ........................... 13

6.0 Menu Navigation ...................................................... 13

6.1 Power Menu ................................................... 16

6.2 Settings Menu ................................................. 16

6.3 Trip History Menu ........................................... 16

6.4 More Menu ..................................................... 16

6.4.1 Time and Date Setting ........................ 16

7.0 QUICK-TRIP® System (optional) .............................. 18

8.0 Voltage Divider Module (VDM) (optional) ............... 20

9.0 SAFE-T-TRIPTM (optional) ........................................ 20

10.0 Sluggish Breaker

11.0 Commissioning the AC-PRO-II® .............................. 21

6.4.2 Battery Test and Status ....................... 17

7.1 QUICK-TRIP® Basics & Operation .................. 18

7.2 AC-PRO-II QUICK-TRIP® Switch Mounting ..... 19

7.3 Remote QUICK-TRIP® Switch......................... 19

7.4 QUICK-TRIP® Remote Indication .................... 19

Detection ................................. 20

11.1 Powering-Up the Trip Unit for Commiss i oni ng . 21

11.1.1 Internal Battery.................................... 21

11.1.2 USB Power ......................................... 21

11.1.3 24VDC Auxiliary Power ....................... 21

11.2 Un-comm issi oned Screen ............................... 21

11.3 Entering & Changing Settings locally .............. 22

11.4 Securi ty Code ................................................. 25

11.5 CT Tap ........................................................... 25

11.6 CT Secondary Rating ..................................... 25

11.7 Power Flow Direction ...................................... 25

11.8 Frequency ...................................................... 25

11.9 Long Time (LT ) ............................................... 25

11.10 Thermal Memory ............................................ 25

11.11 Short-Time (ST) .............................................. 25

11.12 Instantaneous (I) ............................................. 25

11.13 Ground Fault (GF) Protection .......................... 26

11.14 Neutral Overload (NOL) Settings .................... 26

11.15 QUICK-TRIP® Instantaneous (QT-I) ................ 26

11.16 QUICK-TRIP Ground Fault (QT-GF) ............... 26

11.17 Undervoltage (UV) .......................................... 27

11.18 Overvoltage (OV) ........................................... 27

11.19 Sluggish Breaker Setting ................................ 27

11.20 Configurable Alarm Relay Settings ................. 27

11.21 Breaker Position Contact Type Setting ........... 27

11.22 Saving Settings .............................................. 27

11.23 Settings Verification ....................................... 27

11.24 Settings Review ............................................. 28

11.25 Time & Date Settings ..................................... 28

11.26 Communications Settings ............................... 28

12.0 Trip History .............................................................. 29

13.0 Normal Operations & Readings .............................. 31

14.0 Testing ..................................................................... 31

14.1 Commiss i on the Trip Unit ............................... 31

14.2 Long Time Trip Test ....................................... 31

14.3 Short Time Trip Test ...................................... 32

14.4 Instantaneous Trip Test .................................. 32

14.5 Neutral Overload (NOL) Tri p T est ................... 32

14.6 Ground Fault Trip Tests ................................. 32

14.6.1 Residual Ground Fault Trip Test ......... 32

14.6.2 Ground Return Fault Trip Test ............ 32

14.7 QT-GF Trip Test ............................................. 32

14.8 CT Phasing Test for GF ................................. 32

14.9 QT-I Trip Tes t ................................................. 33

14.10 Undervoltage (UV) Test .................................. 33

14.11 Overvoltage (OV) Test ................................... 34

15.0 Secondary Injection Testing ................................... 34

15.1 Secondary I nj ection Test Set .......................... 34

15.2 Standard Rel ay Test Set ................................ 34

15.3 LT Delay Testi ng Chart .................................. 35

15.4 Neutral Overload Test i ng Chart ...................... 36

16.0 Ratings & Physical Information .............................. 36

17.0 Warranty .................................................................. 37

18.0 Time-Current Curves (TCC) .................................... 37

18.1 Long Time (LT ) Trip Time ............................... 37

18.2 Short Time (ST) Trip Time .............................. 38

18.3 Ground Fault (GF) Trip Time .......................... 40

18.4 Neutral Overload (NOL) Tri p Tim e .................. 40

18.5 Current Metering Accuracy ............................. 44

19.0 Voltage & Power Calculations ................................ 44

20.0 Error and Alarms ..................................................... 44

20.1 Internal Error .................................................. 44

20.2 Actuat or Open Circuit ..................................... 44

20.3 Alarm Screens ............................................... 44

20.4 Un-Calibrated ................................................. 44

21.0 Battery ..................................................................... 45

21.1 Checki ng the Battery Voltage ......................... 45

21.2 Battery Replacement ...................................... 45

22.0 Rotating the Display ................................................ 45

23.0 InfoPro-ACTM Software Application ........................ 46

23.1 Firmware Versi ons and Updat es .................... 46

24.0 Communications ..................................................... 49

24.1 Communications Introduction ......................... 49

24.2 Communications Components ....................... 49

24.3 Communications Wiring ................................. 49

24.4 Syst em Components & Computer Hardware .. 49

24.4.1 Ethernet.............................................. 49

24.4.2 LCI Ethernet ....................................... 49

24.5 Trip Unit Programming ................................... 50

24.6 Modbus Registers .......................................... 50

For latest version, visit:

http://www.utilityrelay.com/Side_Bar/Instruction_Manuals.html

Page 1

AC-PRO-II® Instruction Manual www.utilityrelay.com

List of Tables and Figures Figure Page

Figure 4.1 AC-PRO-II Front View - Horizontal Configuration ........................................................................................................ 5

Figure 4.2: AC-PRO-II Front View - Vertical Configuration with Breaker Harness at bottom ...................................................... 6

Figure 4.3: AC-PRO-II Side View (without VDM) ............................................................................................................................ 6

Figure 4.4: AC-PRO-II Angled View s – with and without VDM ...................................................................................................... 7

Figure 4.5: AC-PRO-II connectors and cables ............................................................................................................................... 7

Figure 5.1: AC-PRO-II External Conne ct ions - Vertical Bottom Configuration ............................................................................ 8

Figure 5.2: Voltage Divider Module (VDM) External Connections ................................................................................................ 9

Figure 5.3: AC-PRO-II Typical Wiring Diagram ............................................................................................................................ 10

Figure 5.4: AC-PRO-II Typical Ground Return Wiring Diagram .................................................................................................. 11

Figure 5.5: USB Extension cable .................................................................................................................................................. 12

Figure 5.6: USB Extension Plate Drilling ...................................................................................................................................... 13

Figure 5.7: USB Extension Plate & Cable Installation ................................................................................................................. 13

Figure 6.1: Main Screen ................................................................................................................................................................. 13

Figure 6.2: Typical AC-PRO-II Menu Navigation Map - Simple View ........................................................................................... 15

Figure 6.3: Power Menu Screens .................................................................................................................................................. 16

Figure 6.4: Settings Menu first screen ......................................................................................................................................... 16

Figure 6.5: MORE Menu ................................................................................................................................................................. 17

Figure 7.1: QUICK-TRIP System and Connections ...................................................................................................................... 18

Figure 7.2: AC-PRO-II QUICK-TRIP Switch Drilling Plan ............................................................................................................. 19

Figure 7.3: QUICK-TR IP Switch Mounting .................................................................................................................................... 19

Figure 7.4: AC-PRO-II QUICK-TRIP Switch ................................................................................................................................... 19

Figure 9.1: SAFE-T-TRIP ............................................................................................................................................................... 20

Figure 9.2: SAFE-T-TRIP in case................................................................................................................................................... 20

Figure 10.1: Sluggish Breaker Screen .......................................................................................................................................... 21

Figure 11.1: Un-commissioned Screen ........................................................................................................................................ 21

Figure 11.2: Change Settings Menu - Part 1 ................................................................................................................................. 22

Figure 11.3: Change Settings Menu - Part 2 ................................................................................................................................. 23

Figure 11.4: Change Settings Menu - Part 3 ................................................................................................................................. 24

Figure 11.5: Settings Screen - Review Button ............................................................................................................................. 28

Figure 11.6: Communications Settings ........................................................................................................................................ 28

Figure 12.1: Trip History Menu ..................................................................................................................................................... 30

Figure 13.1: Main (“Readings”) Screen ........................................................................................................................................ 31

Figure 13.2: Power Screen #1: ...................................................................................................................................................... 31

Figure 13.3: Power Screen #2: Energy ......................................................................................................................................... 31

Figure 14.1: Phase A & B, CT Polarity Test .................................................................................................................................. 33

Figure 14.2: Phase B & C, CT Polarity Test .................................................................................................................................. 33

Figure 14.3: Undervoltage Test ..................................................................................................................................................... 33

Figure 14.4: Overvoltage Test ....................................................................................................................................................... 34

Figure 15.1: B-292 Secondary Injection Test Set ......................................................................................................................... 34

Figure 16.1: AC-PRO-II & Quick Trip Switch Drawings and Dimensions ................................................................................... 36

Figure 18.1: Overload TCC ............................................................................................................................................................ 39

Figure 18.2: Ground Fault (GF) TCC ............................................................................................................................................. 41

Figure 18.3: Neutral Overload (NOL) TCC .................................................................................................................................... 42

Figure 18.4: QUICK-TRIP Ground Fault and QUICK-TRIP Instantaneous TCCs ........................................................................ 43

Figure 20.1: Internal Error Screen ................................................................................................................................................ 44

Figure 20.2: Actuator Open screen ............................................................................................................................................... 44

Figure 20.3: Trip Alarm Screen ..................................................................................................................................................... 44

Figure 20.4: OverVoltage Alarm Screen ....................................................................................................................................... 44

Figure 20.5: UnderVoltage Alarm Screen ..................................................................................................................................... 44

Figure 20.6: Clear Alarms Screen ................................................................................................................................................. 44

Figure 20.7: Un-Calibrated Screen ................................................................................................................................................ 44

Figure 21.1: Battery Door .............................................................................................................................................................. 45

Figure 22.1: Display Case Screw locations .................................................................................................................................. 45

Figure 22.2: Trip Unit and Display (separated) ............................................................................................................................ 46

Figure 23.1: InfoPro-AC Readings Tab Screenshot ..................................................................................................................... 47

Figure 23.2: InfoPro-AC Waveform Tab Screenshot.................................................................................................................... 47

Figure 23.3: InfoPro-AC Trip History Tab Screenshot ................................................................................................................. 48

Figure 23.4: InfoPro-AC Settings Tab Screenshot ....................................................................................................................... 48

Figure 24.1: Ethernet configuration .............................................................................................................................................. 50

Figure 24.2: LCI Ethernet Configuration ...................................................................................................................................... 50

Tables Page

Table 3-A: CT Power-up values ...................................................................................................................................................... 4

Table 5-A: Alarm Relay Configuration .......................................................................................................................................... 12

Table 6-A: Common Smart Button Actions .................................................................................................................................. 14

Table 12-A: Trip Types .................................................................................................................................................................. 29

Utility Relay Co m pany

10100 Quee ns Way

Chagrin Fal l s , OH 440 23

www.utilityrelay.com

Phone 888-289-2864

Fax: 440-708-1177

Page 2

AC-PRO-II® Instruction Manual www.utilityrelay.com

1.0 Introduction and Product Overview

1.1 Current Protection and Functions

1.2 Voltage and Power Features - optional Voltage Divider Module (VDM)

1.3 Additional Features

The AC-PRO-II

is a state of the art, micro-controller based trip unit for use on three phase, 600 Volt class, AC circuit breakers on 50 Hertz or 60 Hertz systems. The AC-PRO-II features a rotatable 128 x 64 Multi-line, Organic Light Emitting Diode (OLED) Display, smart buttons, and LEDs.

The standard AC-PRO-II provides:

• Overload and fault protection

• RS485 communications

• QUICK-TRIP

• Patented Sluggish Breaker

• Time stamped trip history with waveform capture

• InfoPro-AC

• Ready for the SAFE-T-TRIP

arc flash hazard reduction ready

software interface

detection

hand-held remote trip

device

• And many other feat ure s

Additionally, with the optional Vol tag e Div ider M odule (VDM

), the AC-PRO-II can provide over/under voltage protection and power calculations.

The AC-PRO-II is 55% smaller t han the original AC-PRO

and including more features and more flexibility. The smaller form factor allows application on a wider range of breaker s. The trip unit features versatile user settings that allow setting the frequency (50Hz or 60Hz), CT secondary ra ting , and Ground Fault type in the field, e li minating t he need for a special factoryconfigured trip unit and si mplify ing the kit ordering process.

The AC-PRO-II is backwards compatible with existing AC-PRO CTs, actuators, wiring harness, and settings, making direct replacements easy. Similar to AC-PRO, the AC-PRO-II settings are entered using simple parameters. No percentages or multipliers are required. AC-PRO-II settings are programmed using the easy-to-read multi-line OLED display.

The AC-PRO-II includes the following Current-based features:

 Long Time (LT)  Short Time (ST)  Instantaneous (I)  Ground Fault (GF)  Thermal Memory (for LT, ST, & GF)  Neutral Overload (NOL)  QUICK-TRIP Instantaneous ( QT-I)  QUICK-TRIP Ground Fault (Q T-GF)  Current Metering  Overload (Long Time pickup) Alarm  Instantaneous Override (I-OVRD)

(factory setting – normally di sabled)

 Instantaneous on Close (I-CLOS)

(factory setting – normally enabled)

The AC-PRO-II measures the true RMS current through each of the breaker’s three poles.

AC-PRO-II settings include a Ground Fault type setting, which allows the user to select either Residual Ground Fault protection (vector sum), or Ground Return Ground F ault protection (measures GF directly).

The QUICK-TRIP Instantaneous and QUICK-TRIP Ground Fault protective settings are available to minimize downstream Arc Flash Hazard.

The AC-PRO-II uses a unique algorithm to determine if the RMS currents are greater than 12 times the CT rating where the CTs may be saturated. The AC-PRO-II then corrects the effect of CT saturation on the Long Time and Short Time trip functions.

The AC-PRO-II can be provided with an optional Voltage Divider Module (VDM) attached to t he ba c k of the trip unit. When configured with the VDM, the AC-PRO-II offers the following Voltage-based features:

• Rated for up to 600V three-phase systems

• Under-Voltage (Brown O ut) trip & alarm

• Over-Voltage trip & alarm

• Voltage metering

• Power metering:

(KW, KVA, KWHr, KVAHr, Power Factor)

• VDM provides continuous trip un it power even when the breaker is open and not carrying current, allowing for communications, even wi thout CT power.

In addition, the AC-PRO-II also features the following: (features are standard for a ll AC-PRO-II trip units unless noted otherwise)

• Configurable alarm relay (form C)

• Self-Test

• Front USB port for settings upload and download,

SAFE-T-TRIP remote trip device, auxiliary power and firmware updates

• OLED multi-line display

• RS-485 Modbus RTU communications

• Versatile user settings provide more flexibility than the

original AC-PRO:

o 50Hz or 60 Hz operation o Phase CT secondary ratings:

1A, 0.5A, 0.4A, 0.25A, 0.2A o Neutral CT secondary ratings: 2A, 1.5A, 1A, 0.5A, 0.4A, 0.25A, 0.2A, 0.18A o Ground Fault type can be set to “Residual” or

“Ground Return” dependi ng on the CT location & Ground Fault scheme.

• Compact form-factor allows the AC-PRO-II to be used on a wide range of breakers, including more insulated case breakers.

• Backwards compatibility with AC-PRO actuators, CT’s, wiring harness, and settings.

• Waveform capture

• Sluggish Breaker

• Time-stamping of Trip events

The trip unit stores the t ri p history data for the last 8 trip events and the trip log data in a non-volatile FRAM memory for later recall. All the settings are stored in non-volatile memory. Battery backup is not required.

The trip unit does not requ ire external power to operate. Power is derived from the current transformers (CTs). An internal battery provides power to r eview and change protection settings when CT power is not available.

The AC-PRO-II trip unit is manufactured under multiple

patents. See the link below for additional information:

http://www.utilityrelay.com/patents.html

Page 3

AC-PRO-II® Instruction Manual www.utilityrelay.com

Current required to power

(in % of CT Primary Rating)

1.0 Amp

0.5 Amp

12%

0.4 Amp

15%

0.25 Amp

24%

0.2 Amp

30%

0.18 Amp

33%

2.0 UL/ULC Classification & CE Mark

3.0 Trip Unit Power

3.1 Current Transformer (CT) Power

3.2 Battery Power

3.3 USB Power

3.4 24VDC Auxiliary Power

3.5 Voltag e Divider Module (VDM) Power (option)

AC-PRO-II® is currently UL and ULC classified for use on the following low voltage AC power circuit breakers:

Square D/Westinghouse DS-206, DS-416, DS-632

General Electric AKR-75

ITE K-600, K-800, K-3000

Siemens/Allis-Chalmers LA-1600

UL and ULC classification is in accordance with UL1066, CSA C22.2, IEEE C37.59-2007 as well as appropriate sections of ANSI C37.17-1979 and C37.50-1989.

The AC-PRO-II has the CE Mark. AC-PRO-II was tested by an independent laboratory and

found in compliance with the following standards:

IEEE C37.90.1-2002, Surge Withstand IEEE C37.90.2-2004, RF Susceptibility EN 61000-4-3: 2006, RF Immunity EN 61000-4-4: 2004, Fast Transient EN 61000-4-5: 2006, Surge Immunity

Press the “DISPLAY” push button to turn the trip unit on

When on battery power, the trip unit will automatically turn

EN 61000-4-2: 2009, Electrostatic Discharge Immunity EN 55011: 2007, Radiated Emissions

A 3-Volt, 850 mAh, CR2, long life Lithium battery is used in the trip unit. There are no restrictions on transport and no special methods of disposal required with this battery.

The AC-PRO-II design uses the battery for the following functions / features:

1) Allows the user to commission (program) the trip unit without using the auxiliary power pack.

2) Allows the user to recall the last trip data even if the breaker is open and without using the auxiliary power pack.

3) Maintains the internal clock for accurate time and date for time stamping the trip history and on-demand waveforms.

4) Allows resetting (unlatching) the alarm relay when no other power source is available.

under battery power.

off 60 seconds after the last button is pushed to conserve battery energy.

**** NOTE ****

The AC-PRO-II can be powered in 5 different ways: CTs, internal battery, USB port, 24VDC auxiliary, or by the Voltage Divider Module (VDM).

The AC-PRO-II is normally powered from the breaker phase CT’s if at least one phase current is above the C T power-up threshold. See Table 3-A for CT power-up values. If the current is not high enough to power the trip unit, the trip unit will power down. If the unit is powered down and a fault occurs requiring rapid response, the high current of the fault provides CT power and the trip unit performs as published in the Time Current Curves.

If the trip unit is connected to a Voltage Divider Module (VDM), USB, or 24VDC auxiliary power, these sources provide constant power.

During normal operation (in service), if the trip unit is powered by current or voltage and no errors are present, the OK LED should be ON. If current is too low or if voltage (via VDM) is not present, pressing the “DISPLAY” Push button will temporarily power up the trip unit and display using the internal battery. The OK LED should then be on.

The AC-PRO-II derives both the signal and power from the breaker phase CTs. For 1-Amp CT’s, the trip unit will powerup with less than 6% of the rated CT tap current through a single CT. See complete table below:

Phase CT Secondary

Rating

AC-PRO-II

The battery is NOT involved in the protective functions of the trip unit. The trip unit will provide protection even if the battery is removed. The battery is NOT required for the trip unit to maintain any of its memory including the user programmed pick-up and delay settings and the last trip data. If the battery voltage is low, the internal date/time clock will not be correct.

See Section 21.0 for battery data and instructions on replacing the battery.

The AC-PRO-II face of the trip unit and it can be used to power the t ri p unit with the USB 5Vdc supplied by a computer, USB wall-pack, etc.

is equipped with a mini-USB port on the

The AC-PRO-II connection to the B-292 Secondary Injection Test Set, and other auxiliary power sources.

URC 24VDC Accessories: 24VDC wall-pack: URC Part # T-490-ASM 24VDC harness: URC Part #CA-AC2-24VDC

24VDC Auxiliary power requirements:

Voltage: 23-28VDC with correct polarity Power supply sizing: 3 watts minimum per AC-PRO-II Protection: protect each AC-PRO-II with 1A fuses Use a minimum of 1 power supply per lineup. Do not ground the minus of the 24VDC system

includes a 24VDC auxiliary power input, for

Table 3-A: CT Power-up values

The AC-PRO-II® trip unit is available with an optional Voltage Divider Module (VDM). The VDM provides breaker 3-Phase voltage used for power information and also provides power for the trip unit independently from the CTs. See Section 8.0 for more information on the Voltage Divider Module (VDM).

Page 4

AC-PRO-II® Instruction Manual www.utilityrelay.com

4.0 AC-PRO-II® Pictures and Configurations

CBA

DFE

Figure 4.1 AC-PRO-II Front View - Horizontal Configuration

A. Local Display (rotatable)

The Local Display is normally mounted to the trip unit. It can be rotat ed or separat ed from the trip unit for specific breakers where space is limited.

B. OLED Display

The display is normally off. Pushing the “DISPLAY” button (C) turns on the display. The OLED displays the following information. Refer to Section 6.0 for menu navigation.

1) Power menu

2) Settings menu

3) Trip history menu

4) More Menu (Trip Unit i nfo)

5) Errors, alarms, and other messages

C. DISPLAY Push Button

Pushing the “DISPLAY” button will turn on the display. If no buttons are pushed for 60 seconds, the display will turn off.

D. Removable wire cover

Cover with printed connection labels. See Section

5.0 for external connections (behind cover).

E. “Smart” Push Buttons

These push buttons perform the functions indicated on the bottom of the OLED display. These buttons are used for all menu navigation.

F. RS-485 Line Termination Switch

This switch should be placed in the ON position only if the trip unit is the last in the RS-485 communications wiring run.

Page 5

G. Red PICK-UP LED

This LED will illuminate if the current exceeds the LT pick-up setting.

H. Green OK (Self-Test) LED

When the trip unit is powered up, this LED is on unless a problem is detected. If the trip unit is not powered up, the OK LED will not be on. If the “DISPLAY” button is pressed, the OK LED should come on, unless a problem is detected. See Section 3.0 for Trip Unit Power and Section 20.0 for Errors.

I. Battery Cover

To replace the battery, remove the single screw and slide battery cover out, remove the old battery and insert a new CR2, 3-Volt Lithium battery. Replace the battery cover and screw. See Section

21.0.

J. Mini-USB Port (shown with cover removed)

The electrically isolated mini-USB port is available for connection to a laptop/ personal computer for uploading & downloading of settings, information, and firmware; SAFE-T-TRIP remote trip device operation; or USB wall pack for auxiliary power.

K. COMM ACTIVE LED

The communications active LED illuminates when the trip unit is transmitting information via Communications.

L. AC-PRO-II Serial Number

AC-PRO-II® Instruction Manual www.utilityrelay.com

AC-PRO-II Trip Unit

Local Display

Trip Unit Wire

Cover

DAF

CEHGK

Figure 4.2: AC-PRO-II Front View - Vertical Configuration with Breaker Harness at bottom

Figure 4.3: AC-PRO-II Side View (without VDM)

Page 6

AC-PRO-II® Instruction Manual www.utilityrelay.com

Voltage Divider

Module (VDM)

Connector

Covers

Shown with VDM and wire cover Shown without VDM and without wire cover

Figure 4.4: AC-PRO-II Angled Views – with and without VDM

Breaker Harness Optional Neutral CT Cable Optional Communications Cable and connector and connector assembly and connector assembly

Figure 4.5: AC-PRO-II connectors and cables

Page 7

AC-PRO-II® Instruction Manual www.utilityrelay.com

5.0 External Connections

1. Auxiliary Terminal Block

2. QUICK-TRIP connector

3. 24VDC Auxiliary power connector

Figure 5.1: AC-PRO-II External Connections - Vertical Bottom Configuration

(Breaker Harness at bottom , shown with wiring cover off)

a. Configurable alar m relay output b. Grou n d Fault Defeat input c. Breaker position contact input

4. RS-485 Communications terminal block

5. Mini-USB port

6. Breaker wiring harness connection

Page 8

AC-PRO-II® Instruction Manual www.utilityrelay.com

Voltage Divider

External Connections

Voltage Divider Module (VDM)

Mounted on Back of AC-PRO-II

Module (VDM)

Figure 5.2: Voltage Divider Module (VDM) External Connections

Page 9

AC-PRO-II® Instruction Manual www.utilityrelay.com

Alarm Relay

5A @ 120VAC

Position Switch

Defeat

as 52a or 52b)

Input

Actuator

Phase A

Phase B

Phase C

Neutral

RS-485

Voltage Divider Module (VDM)

(optional) mounted on back

Voltage Inputs

C G

Current Inputs

24VDC

Aux Pwr

USB

Laptop / PC

SAFE-T-TRIP

AC-PRO-II Local Display Unit

USB Options

Optional Quick-Trip Cable & Connectors

Normal Power Flow

Phase A Phase B Phase C

Neutral

Breaker Harness Cable

Configurable

Indication, or

other function

Customer Alarm,

5A @ 24VDC

URC Breaker (Configurable

1A Fuses

Breaker Harness Plug

SHLD

Breaker Cubical Terminal Block

Optional RS-485 Cable/ Connector Assembly. Maintain

proper polarity. Blue

wire is "+".

To next AC-PRO or

AC-PRO-II trip unit

RS-485 Comm. Loop

COMM.

GND to Breaker frame

Quick-Trip Connector

LOAD

SHLD

Typical RS-485 twisted pair comm. cable by Others.

Wiring provided by Others (#14AWG - #30AWG)

Neutral CT Connector

Actuator

Neutral CT is optional. Only for 4-wire systems with Ground Fault Protection and/or Neutral Overload protection.

WIRE CODE R = Red B = Black W = White Y = Yellow L = Blue N = Brown G = Green CL = CLEAR BA = BARE

R B L W Y W N W G W

BA L CL

Optional Quick-Trip System

Phase CTs

#18 AWG type MTW (Black)

Color code tape or labels by Others

#14 AWG type SIS (Gray)

USB Extension

USB Extension port in switchgear door

3-Phase Source

CT Configuration shown allows for Residual Ground Fault protection and Neutral Overload Protection.

(Cable by Others)

AC-PRO-II

Quick-Trip Swit ch

See Section

7.0 for Remote QT Switch & Indication

wiring

OFF

QT ON

COMM

PICKUP

Current Limiting

Spare

AC-PRO / AC-PRO-II

B-292 Test Set

Push

Verify

DISPLAY

Currents Connector

Actuator Connector

1: +24VDC 2: GND

Figure 5.3: AC-PRO-II Typical Wiring Diagram

Page 10

AC-PRO-II® Instruction Manual www.utilityrelay.com

Actuator

Phase A Phase B Phase C Neutral

Current Inputs

Normal Power Flow

Phase A Phase B Phase C

Neutral

Breaker Harness Cable

Breaker Harness Plug

LOAD

Neutral CT Connector

WIRE CODE R = Red B = Black W = White Y = Yellow L = Blue N = Brown G = Green CL = CLEAR BA = BARE

R B

L WYW N W

G W

Phase CTs

3-Phase Source

CT Configuration shown is for "Ground Fault Return" protection type. (Neutral CT input is used for Ground Fault Protection)

AC-PRO-II

Ground Return CT is optional. Only on 4-wire system with Ground Fault protection.

5.1 Breaker Wiring Harness

5.1.1 Ground Fault Wiring Configurations

5.2 QUICK-TRIP® Connector

5.3 Auxiliary Connections

5.3.1 Configurable Alarm Relay

Figure 5.4: AC-PRO-II Typical Ground Return Wiring Diagram

The breaker wiring harness connects the trip unit to the CTs and actuator. The wiring harness plugs into the 10-pin connector on the front of the trip unit and is retained with two screws. The breaker wiring harness includes wires f or the Actuator, Phase A CT, Phase B CT, Phase C CT, and optional Neutral CT. Two ejector levers are provided to help in disconnecting the harness connector. The ejector levers also lock the connector in place.

A neutral CT wiring harness is provided as part of the neutral CT installation kit. The neutral CT kit is required for units applied to 4-wire systems where Ground Fault protection is desired or required. The ground fault function on a 3-wire system does not require a neutral CT. Additionally, this connection method allows Neutral Overload Protection to be implemented.

The breaker wiring harness connection to the AC-PRO-II is compatible with existing AC-PRO breaker wiring harness.

The AC-PRO-II is compatible with multiple types of existing Ground Fault protection schemes.

Figure 5.3 shows a residual Ground Fault wiring diagram. For this configuration, the AC-PRO-II calculates the residual Ground Fault current. If the system is a 4-wire (3-phase + neutral), the neutral CT must be provided if Ground Fault protection is desired.

Figure 5.4 shows a ground return Ground Fault wiring diagram. For this configuration, the AC-PRO-II directly measures the Ground Return current on the neutral current input. This configuration only applies to 4-wire systems where Ground Fault protection is required. Neutral Overload protection cannot be implemented if the Ground Fault type is Ground Return.

See Section 11.13 for Ground Fault settings.

Page 11

Contact Utility Relay Company if your Ground Fault Protection scheme is different than the typical schemes shown above.

**** NOTE ****

For Ground Fault protection at Mains & Ties of 4-wire double-ended substations, see Technical Bulletin #1 at the link below:

http://www.utilityrelay.com/Side_Bar/Technical_Bulletins.html

All AC-PRO-II trip units are equipped with the capability of connecting to an AC-PRO-II QUICK-TRIP Switch, which provides arc flash hazard reduction. Refer to Section 7.0 for QUICK-TRIP system inform ation.

The auxiliary terminal block is available for the alarm relay output, Ground Fault defeat Input, and breaker position input. See the terminal labels in Figure 5.3.

Wiring for the auxiliary terminal block is not furnished in AC-PRO-II retrofit ki ts .

The auxiliary terminal block features set-screw connections and accepts #14AWG - #30 AWG conductors.

The AC-PRO-II is equipped with an internal configurable alarm relay that has (1) Form C output contact for external wiring. The output contacts are rated 5A @ 120VAC or 5A @ 24VDC.

The configuration of this relay is included in the settings menu. All related alarms and errors result in a specific message on the display screen. The alarm relay can be configured to operate for any combination of the conditions

AC-PRO-II® Instruction Manual www.utilityrelay.com

Alarm

Condition

Actuator

Open Error

Sluggish

Breaker

5.3.2 Ground Fault Defeat Input

5.3.3 URC Breaker Position Switch

5.4 RS-485 Communications Terminal Block

5.5 24VDC Auxiliary Power

5.6 USB Port

5.6.1 USB Extension cable

listed in Table 5-A. The reset method for each alarm condition is also listed in the Table below.

Reset Method

Trip Manual reset

Internal Error Auto reset

Auto reset Manual reset

UnderVoltage Manual reset

OverVoltage Manual reset

LT Pickup Auto reset

“Manual” = reset by user “Auto” = trip unit resets when condition no longer present

Table 5-A: Alarm Relay Configuration

The alarms listed as “Manual Reset” can be reset at the alarm screens or at the manual reset screen. Additionally, the alarm relay c an be manuall y reset usi ng the “More” menu. See Section 20.0 for the alarm screens and Section

6.4 for the manual alarm reset screen.

**** NOTE ****

If no other power source is available, the battery is used to reset the alarm relay. (applies to manual resets only)

The Ground Fault defeat input is used to temporarily disable Ground Fault protection. Defeating Ground Fault protection is necessary for some protective schemes, for example double-ended switchgear that is operated with the tie breaker closed.

When the Ground Fault defeat input is open, the Ground Fault protective function will operate normally. When the Ground Fault defeat input terminals are shorted, the Ground Fault current (if any) will be calculated and displayed, however Ground Fault trips will not occur.

Note: If the GF Defeat input is opened during a Ground Fault event, the Ground Fault protection function will begin functioning and timing as soon as the Ground Fault Defeat input is opened.

The 24VDC auxiliary power port is available for connection to the following sources:

1) B-292 Secondary Injection Test Set.

2) T-490-ASM 24VDC Power Supply.

3) Customer supplied auxiliary power. See Section 3.4.

The USB Port (mini-USB) on the front of the trip unit is electrically isolated and available for the following connection options:

1) Laptop or personal computer with InfoPro-AC software: a. Download and/or print all data from trip unit,

including settings, trip history, waveform s, etc. b. Upload of new or modified settings to trip unit c. Upload of firmware updates. d. View trip unit currents, voltages, power, alarms,

status, serial number, firmware version, etc.

2) SAFE-T-TRIP remote trip device. A rubber cover is provided for the USB port.

**** IMPORTANT ****

Replace the USB port cover after use.

If the AC-PRO-II is installed on a breaker where the face of the trip unit is not concealed by a cubicle door, the USB port on the face of the trip unit itself can be safely accessed.

If the AC-PRO-II is installed on a breaker concealed behind a cubicle door, the kit will include a USB extender cable that mounts flush in the door. This allows the USB port to be used without opening the door. See Section 5.6.1 for USB extension cable information.

If AC-PRO-II is installed on a breaker that is located behind a cubicle door, a USB panel mount extension cable and legend plate is provided in the retrofit kit. This provides a permanent USB connection from the AC-PRO-II to a USB port that is accessible at the cubicle door. The cable (5/C, 6 feet long) features a right angle mini-USB connector for the AC-PRO-II and a USB port with cover, and a threaded nut for securing to the cubicle door.

If a breaker position limit switch was provided by URC with the breaker retrofit kit, it can be wired to the breaker position contact “a/b” input for breaker position indication, and also to allow the patented Sluggish Breaker operate with low or no breaker current. The type of breaker contact used is configured in the settings menu. The breaker contact type can be set as 52a (contact normally open when the breaker is open), or 52b (contact normally closed when the breaker is open).

The RS-485 communications terminal block on t he AC-PRO-II provides communication using the industry standard MODBUS RTU protocol through a single shielded twisted pair cable. Refer to the Communications Section of this manual for additional information.

detection feature to

Page 12

Figure 5.5: USB Extension cable

AC-PRO-II® Instruction Manual www.utilityrelay.com

USB PORT

AC-PRO-II Trip Unit

Use for SAFE-T-TRIP

and for InfoPro

Data Access

Drill (2) 3/16" holes

through door or panel

Drill 1" hole or use

1-9/16"

25/32"

Stainless steel Yellow w/ black text

USB legend plate

through door or panel (D hole in legend plate ensures that USB port is oriented properly)

3/4" conduit punch

5.7 VDM Connections (optional)

6.0 Menu Navigation

USB Extension Cable

Breaker Cubicle Door

USB Legend Plate

USB Water Tight

Cover

(2) 8-32 Screws, lock

washers & nuts

5.6.2 USB Extension Cable Installation

Figure 5.6: USB Extension Plate Drilling

The optional Voltage Divider Module (VDM) is available for voltage-based protection and information functions. The VDM requires connection to the line-side bus of the breaker for Phase A, B, and C, as well as a connection to the breaker frame for Ground. Refer to Section 8.0 for additional Voltage Divider Module (VDM) information.

AC-PRO-II settings and information can be navigated using the push buttons on the face of the trip unit. Pressing the “DISPLAY” button wakes the display up from its power saving mode. After the display is on, all menu navigation is accomplished using the screen prompts and (4) smart buttons below the display. The smart button labels appear at the bottom of the screen.

In normal operation, the main screen is the first screen displayed after waking the display up. The main screen provides actual values for Phase A, B, and C current, as well as Neutral and Ground Fault currents. For Phase currents below 10% of the CT rating, “LOW” will be displayed. Neutral and Ground Fault fields will be blanked when these currents are below 10% of the CT rating.

Additionally, if a Voltage Divider Module (VDM) is present, the main screen also displays line-to-neutral voltages for Phase A, B, and C. The main screen also provides access to four (4) main menus via smart buttons. See the main screen example below along with list of menus and submenus:

Figure 5.7: USB Extension Plate & Cable

Installation

To install the USB Extension cable:

1. Find a suitable location on the cubicle door and mark the three (3) holes using the dimensions in Figure 5.6.

2. Drill two (2) 3/16” mounting holes.

3. For the center hole, cut a 1” diameter hole using a hole saw or alternately, use a 3/4” conduit knockout punch.

4. Attach the USB legend plate to the front of the cubicle door using the supplied two (2) 8-32 screws, nuts, and lock washers.

5. Connect the right-angle USB connector to the

AC-PRO-II. Route the cable so it does not interfere with

the opening or closing of the cubical door or with the racking of the breaker between connect and disconnect positions. Use the supplied cable ties and holders to hold the cable in position.

6. Position the USB port through the 1” opening and through the opening in the legend plate. Ensure one rubber washer is on the interior of the door / panel, and the threaded USB cover and rubber washer are on the exterior.

7. Thread the plastic nut onto the USB port connector, securing it to the door / panel.

1) PWR (Power Menu): This menu provides access

2) SET (Settings Menu).

3) HIST (Trip History Menu): This menu provides

4) MORE (T ri p Uni t Inform at i on Menu): This menu

See Section 13.0 for information on values displayed on readings screens.

For reference, see the following table for common smart buttons and associated actions, which may appear depending on the specific screen.

Figure 6.1: Main Screen

(Optional voltage values shown)

to power values, which become available if the optional Voltage Divider Module (VDM) is connected.

a. REV (Review Settings sub-menu): This sub-

menu allows review of all user settings without the option of changing the settings.

b. CHNG (Change Settings sub-menu): Thi s

sub-menu allows the user to change all protection, alarm, and breaker information settings.

c. 485 (RS485 Communication Settings): This

sub-menu is for changing RS485 communications settings only.

access to trip history information for up to eight (8) trips.

includes serial number(s), time & date settings, battery status, URC contact info, etc.

Page 13

AC-PRO-II® Instruction Manual www.utilityrelay.com

Smart

Button Label

Return the previous screen or previous setting

Increase setting value or toggle to next setting value.

Decrease setting value or toggle to previous setting value.

Action

Next Proceed to next screen or next setting

Back

Exit Return to the Main Screen

Down

ON Turn function or feature ON.

OFF Turn function or feature OFF.

Table 6-A: Common Smart Button Actions

The following figure shows a simple view menu navigation map.

Page 14

AC-PRO-II® Instruction Manual www.utilityrelay.com

POWER

PWR SET HIST MORE

SETTINGS

REV CHNG 485 EXIT

CT TAP

CT SEC. RATINGS &

POWER FLOW DIRECTION

FREQ

LT SETTINGS

ST SETTINGS

INST SETTINGS

GF SETTINGS

QUICK TRIP SETTINGS

OV SETTINGS

ALARM RLY SETTINGS 1

ALARM RLY SETTINGS 2

RS-485 SETTINGS 1

CT TAP

CT SEC. RATINGS & POWER FLOW DIRECTION

FREQ

LT SETTINGS

ST SETTINGS

INST SETTINGS

NEUT OVERLOAD SETTING

GF SETTINGS

QUICK TRIP SETTINGS

OV SETTINGS

ALARM RLY SETTINGS 1

ALARM RLY SETTINGS 2

BKR CONTACT SETTING

SECURITY CODE

VERIFY SETTINGS

MAIN

("READINGS" SCREEN)

RS-485 SETTINGS 1

Rev Clear More Exit

TRIP HISTORY SCREEN 1

TRIP TYPE, DATE, TIME, #

Util Time Exit Next

TRIP UNIT INFO (S.N. & F/W)

TRIP CURRENTS & VOLT.

BKR CLEARING TIME

CONFIRM

NEUT OVERLOAD SETTING

Rev

TRIP HISTORY

SCREEN 2

URC CONTACT INFO

Clear

TIME & DATE

CHANGE TIME & DATE

ALARM RELAY RESET

LOCAL DISPLAY INFO

KEY

SETTING / SCREEN WILL APPEAR IF VDM MODULE IS CONNECTED.

UV SETTINGS

BKR CONTACT SETTING

SETTINGS SAVED

REVIEW ADDITIONAL TRIPS

SLUGGISH BKR SETTING

RS-485 SETTINGS 2

OTHER SCREENS

NO PROTECTION - INTERNAL ERROR

NO PROTECTION - ACTUATOR OPEN CIRCUIT

UN-CALIBRATED

UN-COMMISSIONED

TRIP ALARM

SLUGGISH BREAKER ALARM

OVERVOLTAGE ALARM

UNDERVOLTAGE ALARM

NOTE:

POWERING ON SPLASH SCREEN

THIS IS A TYPICAL MAP. SCREENS & SEQUENCES VARY DEPENDING ON ORDER CODES AND SETTINGS.

SETTINGS REVIEW SEQUENCE

SETTINGS CHANGE SEQUENCE

KW, KVA, PF

KWHr, KVAHr

POWER

BATTERY TEST

CONFIRM

1st Screen if

Under CT Power

1st Screen if on

Battery Power

Figure 6.2: Typical AC-PRO-II Menu Navigation Map - Simple View

Page 15

AC-PRO-II® Instruction Manual www.utilityrelay.com

There is no provision for daylight savings time.

6.1 Power Menu

6.2 Settings Menu

6.3 Trip History Menu

6.4 More Menu

6.4.1 Time and Date Setting

If the AC-PRO-II is equipped with the optional Voltage Divider Module (VDM), the power menu becomes available. The power menu is accessed from the main screen by pressing the “PWR” smart button. The smart buttons allow navigation to subsequent screens, which display power information, as well as the capability of resetting energy usage values. The figure below shows the flow of the Power Menu.

Press PWR to access Power Menu

Press SET to access the settings menu

Figure 6.4: Settings Menu first screen

For details regarding Settings, refer to Section 11.0.

The AC-PRO-II stores data from the last eight (8) trips. The trip history menu displays this inform ation. The trip unit stores trip counts, types, time stamps, and currents. If a VDM is connected, voltages will also be stored in the trip history. Additionally, the breaker clearing times for noninstantaneous trips are stored. Refer to Secti on 12.0 for details regarding trip history and navigating the trip history menu. In addition to the data displayed on the trip unit display, the AC-PRO-II also saves current and voltage waveforms that can be displayed using InfoPro-AC Software. See Section

23.0.

Figure 6.3: Power Menu Screens

Note: Power Menu only appears if the optional VDM is

See Section 13.0 for information on values displayed on the readings screens.

The settings menu provides the ability to review and modify settings. The first settings menu screen provides access to the following settings sub-menus by pressing the associated smart push buttons: review settings sub-menu, change settings sub-menu, and RS-485 settings sub-menu. See the settings menu first screen in the following figure:

connected.

The more menu provides access to the following trip unit information:

1) T ri p uni t s eri al number.

2) Local display serial number (this is separately provided since the local display can be separated from the trip unit).

3) Trip unit firmware revision number.

4) Local display firmware revision number.

5) Viewing and setting time and date.

6) Manually reset the alarm relay

7) Battery test and status.

8) Utility Relay Company contact information.

The time and date setting is accessed via the MORE menu, by pressing the MORE button at the main screen, then the time button, then the change button, as shown and noted below in Figure 6.5.

The time and date setting is important, as trip events and waveform captures are time stamped.

**** IMPORTANT ****

The time and date must be set after commissioning the AC-PRO-II or after replacing the battery to ensure the time stamps (of trips and on-demand waveforms) are recorded and are correct.

In order for the time and date to remain accurate after setting, a fresh battery must be in place.

Page 16

AC-PRO-II® Instruction Manual www.utilityrelay.com

PWR

SET

HIST MORE

GF:

xxxxA xxxxA xxxxA xxxxA xxxxA

xxxVan xxxVbn xxxVcn

A: B: C:

URC

Time Exit Next

Utility Relay Co.

TRIP UNIT Information

S/N xxxxxxxxxx

Firm. Rev. x.x.xx.xxx

Exit

Time And Date

xx:xx:xx PM xx/xx/xxxx

AC-PRO-II

Exit

Exit Back

Utility Relay Co. www.utilityrelay.com Phone (888)289-2864

Change

Time And Date

xx:xx:xx PM xx/xx/xxxx

Up Down Exit Next

Utility Relay Co.

DISPLAY Information

S/N xxxxxxxxxx

AC-PRO-II LOCAL

Back

Exit

Battery Test x.x V

Battery State

Back

Test

The Voltage values and

"PWR" button only appear if

the optional Voltage Divider

Module (VDM ) is connected.

The Battery Test voltage is blank until "Test" is pushed, after which the voltage is displayed.

If Battery voltage is less than 2.2V, the "**REPLACE BATTERY**" message appears.

**REPLACE BATTERY**

Firm. Rev. x.x.xx.xxx

Press MORE to access MORE Menu

o o o

"Up" and "Down" are used to

change values. The "Next" button is used to proceed to the next setting. The "Back" button

and "AM" & "PM" buttons will

also appear in the Time & Date

setting sequence.

Separate serial numbers are reported for Trip Unit and Local Display since they can be separated.

Util

Manually Clear All Alarms and Reset

Next Reset Exit

Back

Clear Back

MAIN

"READINGS"

SCREEN

Alarm Relay?

Confirm Clear/Reset? This may take up to 10 seconds. Screen will shut off when Alarm relay resets.

6.4.2 Battery Test and Status

The trip unit internal battery state can be tested and viewed using the MORE menu. Press “MORE”, then press “Util”, then “Next” as shown below.

At the battery state screen, the battery voltage is not displayed until a battery test (during the current trip unit power cycle) is performed by pressing the test button.

Figure 6.5: MORE Menu

Page 17

AC-PRO-II® Instruction Manual www.utilityrelay.com

on back of

Plug into

QT Switch

"QUICK-TRIP

Plug into Jack

with QUICK-TRIP turned ON

Red LED is "ON"

Connector"

AC-PRO-II

Push

Verify

Quick-Trip ON

Quick-Trip OFF

Quick-Trip ON

Quick-Trip Switch

Arc Flash Hazard Reduction Switch

(only for use with AC-PRO-II trip unit)

Lockable Guard

Note: QUICK-TRIP Switch

cable

4/C QUICK-TRIP

is not shown

Optional Customer

Wiring & Devices

Remote ON/OFF

Switch

Remote

Indication

120VAC 0.5A

Terminals on back of AC-PRO-II QT Switch

Closes if QT Switch is on ON position or if 120V applied to Remote switch terminals

120VAC +/- 15%

120VAC

USB

AC-PRO-II

COMM

PICKUP

DISPLAY

7.0 QUICK-TRIP® System (optional)

7.1 QUICK-TRIP® Basics & Operation

**** NOTE ****

**** IMPORTANT ****

determine the Hazard Risk Categories (HRC).

The QUICK-TRIP system is a manually controlled arc flash hazard reduction system. It can reduce trip times when turned on and allows selective coordination between circuit breakers when turned off.

If maintenance personnel must work on energized equipment, they will first turn the QUICK-TRIP system on at the upstream breaker feeding the equipment or breaker. If a fault now occurs, the upstream breaker will trip quickly based on the QUICK-TRIP settings reducing the Arc Flash Hazard to personnel.

When the maintenance wor k is finished, the QUICK-TRIP system is turned off and the original selective coordination is back in effect.

The QUICK-TRIP system consists of the following components:

1) AC-PRO-II trip unit.

2) AC-PRO-II QUICK TRIP Switch: (URC Part #QT2-SWITCH) consisting of Padlockable QUICK-TRIP On/Off toggle switch, QUICK-TRIP On LED, Push-to-Verify button, Remote Switc h T erminals, and Remote Indication Terminals.

3) 4/C QUICK-TRIP cable with connectors.

Figure 7.1: QUICK-TRIP System and Connections

When QUICK-TRIP is on, the following settings are enabled:

• I QUICK-TRIP (I QT)

• GF QUICK-TRIP (GF QT)

These are standard AC-PRO-II settings. All other settings remain in effect. Refer to Section 6.2.

The “QUICK-TRIP ON LED” provides positive indication that the QUICK-TRIP settings are active if the LED is on. If the AC-PRO-II is not powered up (by current, voltage (VDM), USB or 24VDC Aux.), the QUICK-TRIP Switch “Push-to-Verify” button is available. Pressing this button will “wake up” the trip unit using the AC-PRO-II battery, and the QUICK-TRIP ON LED will illuminate, providing positive indication that the QUICK-TRIP switc h or remote QUICK-TRIP switch is in the ON position.

QUICK-TRIP Instantaneous and QUICK-TRIP Ground Fault features can be activated only if the AC-PRO-II is installed with (connected to) an AC-PRO-II QUICK-TRIP switch.

A qualified engineer must determine the QUICK-TRIP settings, calculate the incident energy levels and

Page 18

AC-PRO-II® Instruction Manual www.utilityrelay.com

1 7/8" 1 7/8"

7.2 AC-PRO-II QUICK-TRIP® Switch Mounting

7.3 Remote QUICK-TRIP® Switch

7.4 QUICK-TRIP® Remote Indication

**** NOTE ****

switch.

Drill 1 ¾” diameter hole conduit knockout punch

Outline of AC-PRO-II QUICK-TRIP Switch

Drill (2) ¼” diameter holes

QUICK-TRIP Switch Side View

(2) 10-32 X 1/2 Screw & Lock Washer

or alternately use 1 ¼”

Figure 7.2: AC-PRO-II QUICK-TRIP Switch Drilling Plan

The QUICK-TRIP system is easy to install on the front of the breaker cubicle door.

To install the QUICK-TRIP Switch:

1. Find a suitable location on the cubicle door and mark the location of the three (3) holes using the dimensions in Figure 7.2.

2. Drill two (2) 1/4” mounting holes.

3. For the center hole, cut a 1-3/4” diameter hole using a hole saw or alternately, use a 1-1/4” conduit knockout punch (1.73” D).

4. Attach the QUICK-TRIP Switch to the front of the cubicle door using the two (2) supplied 10-32 screws and lock washers.

5. Connect the QUICK-TRIP Switch to the AC-PRO-II trip unit by plugging one end of the 4/C cable provided into the jack on the back of the QUICK-TRIP Switch. Plug the other end of the cable into the “QT” jack on the front of the AC-PRO-II.

6. Route the cable so it does not interfere with the opening or closing of the cubical door or with the racking of the breaker between connect and disconnect positions. Use cable ties and holders to hold the cable in position.

Figure 7.4: AC-PRO-II QUICK-TRIP Switch

The AC-PRO-II QUICK-TRIP switch includes terminals on the rear for connection to a remote QUICK-TRIP switch (provided by others).

Refer to Figure 7.1. If 120VAC (+/- 15%) is applied to the remote QUICK-TRIP switch terminals, the QUICK-TRIP settings are activated.

Figure 7.3: QUICK-TRIP Switch Mounting

QUICK-TRIP protection can be activated (by applying 120VAC to the remote Quick Trip switch terminals) even when the AC-PRO-II QUICK-TRIP toggle switch is in the OFF position. Therefore, if a remote QUICK-TRIP switch is installed, URC recommends installing label(s) or nameplate(s) that indicate the presence and location of the remote QUICK-TRIP

The AC-PRO-II QUICK-TRIP switch includes terminals on the rear for connection to a customer-supplied remote QUICK-TRIP indicating light or other device.

Refer to Figure 7.1 (ON), the Remote QUICK-TRIP trip Indication contacts close. The contacts are rated 120VAC, 0.5A.

. If the QUICK-TRIP System is activat ed

Page 19

AC-PRO-II® Instruction Manual www.utilityrelay.com

**** NOTE ****

current to be 10% of the CT rating or greater.

**** NOTE ****

Secondary Injection Test sets.

8.0 Voltag e Divider Module (VDM) (optional)

9.0 SAFE-T-TRIPTM (optional)

10.0 Sluggish Breaker

Detection

The optional Voltage Divider Module (VDM) provides the following voltage-based protection and voltage and power calculations:

 Under-Voltage Trip & Alarm (Brown Out)  Over-Voltage Trip & Alarm  Voltage Metering  Power Metering:

The VDM is rated for up to 600V three-phase power systems. In addition, the VDM provides continual power to the AC-PRO-II when the breaker line side is powered, allowing the trip unit to communicate breaker status even if the breaker is open or not carrying sufficient current. For that reason, the VDM option is recommended if the trip unit will be incorporated in a communications system to avoid possibility of intermittent communications.

The VDM mounts directly to the back of the AC-PRO-II and connects to the trip unit via an internal ribbon cable.

See Figure 5.2 for VDM picture and Figure 5.3 for a diagram.

The SAFE-T-TRIP remote t rip device is available for the AC-PRO-II. The SAFE-T-TRIP allows an operator to trip open a breaker without standing in front of the breaker. It also provides a way to obtain the breaker mechanism operation speed for the important first operation. This is accomplished using the patented Sluggish Breaker feature in the AC-PRO-II.

The SAFE-T-TRIP device is furnished with a permanently connected 15-foot USB cable, allowing the breaker to be tripped without standing directly in front of the breaker, thus reducing the arc flash hazard risk .

The SAFE-T-TRIP device connects directly to the trip unit Mini-USB port or the door-mounted USB Extender.

The SAFE-T-TRIP device should not be operated while standing in front of a racked in breaker or breaker cubicle. The SAFE-T-TRIP is supplied with a 9V lithium battery, the attached USB cable with magnetic cable wrap (for stress relief), and Instructions, in a durable, waterproof case.

(KW, KVA, KWHr, KVAHr, Power Factor)

Figure 9.2: SAFE-T-TRIP in case

The AC-PRO-II patented Sluggish Breaker Detection feature captures the breaker clearing time when a trip occurs that was initiated by the trip unit. If the breaker clearing time is in excess of the Sluggish Breaker clearing time setting (see Section 11.19), an alarm message will appear, and if set, the alarm relay will operate.

If a “sluggish” trip occurs, breaker mechanism maintenance is required.

When the AC-PRO-II sends a trip pulse to the breaker actuator, the Sluggish Breaker timer starts. The trip unit determines the breaker clearing time by one of two methods:

1) Z ero Current Method: If an auxiliary breaker position contact is NOT wired into the trip unit, the breaker position contact user setting should be set to “OFF”, and the trip unit will record the breaker clearing time by monitoring the current values. The Sluggish Breaker timer stops when the current is zero. This method records the breaker clearing time for each breaker pole.

When using the zero current method, the Sluggish Breaker feature requires the pre-trip primary

2) URC Breaker Positition Switch Method: If a breaker position contact is wired into the trip unit, the breaker position contact user setting should set to “52a” or “52b”, and the trip unit will record the breaker clearing time based on the change in state of the auxiliary breaker contact. The Sluggish Breaker timer stops when the contact changes state. This method records one breaker clearing time and reports the same value for each pole.

Figure 9.1: SAFE-T-TRIP

Page 20

The Sluggish Breaker feature does not work with

Additionally, the breaker clearing time can be considered when performing Arc Flash Studies. Any modifications of clearing times used in Arc Flash Studies should be performed by a qualified engineer.

AC-PRO-II® Instruction Manual www.utilityrelay.com

**** IMPORTANT ****

functional.

11.0 Commissioning the AC-PRO-II

11.1 Powering-Up the Trip Unit for Commissioning

11.1.1 Internal Battery

11.1.2 USB Pow er

11.1.3 24VDC Auxiliary Power

11.2 Un-commissioned Screen

Apply 24 VDC to the "+24VDC Aux Power" connector located on the front of the trip unit, primarily for the Secondary Injection Test Set. Refer to Section 3.4 for additional sources.

After the AC-PRO-II is installed on the breaker and powered up, it must be commissioned as follows:

1) Press the “DISPLAY” button to turn on the display.

2) The “Un-commissioned” message will appear (see figure below).

Figure 11.1: Un-commissioned Screen

Pressing “SET” will start the user settings process. See Section 11.3.

Pressing “MORE” will go to the “MORE” menu. See Section

6.4.

Figure 10.1: Sluggish Breaker Screen

Before the AC-PRO-II trip unit is put into service, it must first be commissioned so it will function. This requires the user to enter all of the pick-up and delay settings into the unit.

The commissioning process normally takes less than a few minutes to complete.

The AC-PRO-II can be commissioned using the local display screen, or using the InfoPro-AC software application. For commissioning using the local display screen, continue reading this section. For commissioning using the InfoPro-AC software application, see Section 23.0, and the InfoPro-AC help guide included in the application.

The trip unit will NOT FUNCTION as it is shipped from the factory. The user must first COMMISSION the unit as outlined in this Section or Section 11.3 to make it

In normal service, the AC-PRO-II is powered directly from the breaker mounted CT’s.

For commissioning, the trip unit can be powered up in any of the following ways:

Press the "DISPLAY" button to power-up the trip unit using the internal battery.

The trip unit is designed to shut off automatically if none of the push buttons on the face of the unit are pressed for 60 seconds. It is best to have all the desired settings readily available before commissioning the unit when using the battery.

If the unit shuts down before the commissioning process is completed, the process must be started again from the beginning.

Connect a laptop, PC, or USB wallpack to the front mini-USB port of the AC-PRO-II, or the USB extension port. The unit will be powered continuously, regardless of the power system current and voltage.

Page 21

AC-PRO-II® Instruction Manual www.utilityrelay.com

PWR SET HIST MORE

GF:

xxxxA xxxxA xxxxA xxxxA xxxxA

xxxVan xxxVbn xxxVcn

A: B: C:

REV CHNG 485 EXIT

"EXIT" to Exit

**SETTINGS**

"485" to change 485

"CHNG" to Change

"REV" to Review

tap on breaker CT's

CT Tap xxxxA

**IMPORTANT**

Must match actual

Frequency Setting

Frequency (Hz) xx

Up Down Next Exit

Security Code

enter 4 digit code

To change settings

0000

Up Down Enter

Security Code

enter 4 digit code

To change settings

1234

Press enter after last digit

Up Down Exit Enter

50Hz. 60Hz. EnterBack

The left buttons are for setting adjustments. These buttons change depending on setting options. i.e. "Up/Down" or "ON/OFF".

Other buttons function as follows:

Return to previous screen or previous setting digit/value.

Back:

Advance to next screen or next setting digit/value.

Enter:

Return to Main screen.Exit:

The Security Code is the last four (4) digits of the Serial Number. See Section 4.0 for location of Serial Number. Use the Up and Down buttons for each digit. Use Next button to advance to next digit.

TYPICAL SETTINGS BUTTON NOTES

CT rating range: 50A to 5000A in 25A steps. 5000 to 6250A in 250A steps, and 6300A

Phase CT options:

1.0, 0.5, 0.4, 0.25, 0.20 Neutral CT options:

2.0, 1.5, 1.0, 0.5, 0.4, 0.25, 0.20, 0.18

Select 50Hz or 60Hz

o o o

Push "CHNG" to Change Settings.

SET MORE

**WARNING**

Enter settings before

placing in service

Push "SET" to begin

NO PROTECTION

Push "SET" for Settings Menu

(Settings Menu is also accessed from the Main screen)

"Un-commissioned" screen

The CT rating entered into the trip unit must correspond to the actual rating of the phase and neutral CT taps.

Long Time (LT) Enabled ON Pick-Up xxxx Amp Delay xx.x Sec Therm Mem ON

Up Down Enter

Back

TO SHORT TIME SETTINGS.

SEE NEXT PAGE.

LT is ON unless ordered with "LT can be turned OFF" option

LT Pickup steps: 5A steps for CT>225A

0.5A steps for CT<=225A

LT Delay range: 2.0 to 30.0 seconds. LT Delay can be extended to 50.0 seconds if specifically ordered.

Thermal memory can be turned ON or OFF.

LT Pickup range: 0.5A & 1.0A Ph CT 20% to 100% of CT Rating

LT Pickup range: 0.4A Ph CT & below 50% to 100% of CT Rating

LT Pickup range can be extended to 120% if specifically ordered

SEE SECTION 6.0 FOR MENU NAVIGATION AND TABLE 6-A FOR COMMON SMART BUTTON ACTIONS.

CT Secondary Rating

Phase x.xx Amps Neutral x.xx Amps

Up Down Back Enter

Power Flow Direction

NORMAL

Power Flow Direction options: NORMAL or REVERSE

11.3 Entering & Changing Settings locally

Figure 11.2: Change Settings Menu - Part 1

Page 22

AC-PRO-II® Instruction Manual www.utilityrelay.com

Short Time (ST) Enabled ON Pick-Up xxxx Amp Delay 0.xx Sec

I2T Ramp OFF

Instantaneous (I)

Enabled ON Pick-Up xxxxx Amp

Neutral Overload (NOL) Enabled OFF Pick-Up xxxxx Amp

I-OVRD fixed at 12xCT I-CLOS fixed at 12xCT

Delay xx.x Sec Therm Mem OFF

Ground Fault (GF) GF Type Residual Pick-Up xxxx Amp Delay 0.xx Sec Slope OFF

Quick Trip (QT) QT-I xxxxx Amp

QT-GF Amp xxxx Amp

UNDERVoltage (UV) TRIP OFF

UV Pickup xxxV L-N UV Delay xxx Sec

ALARM ON

OVERVoltage (OV) TRIP OFF

OV Pickup xxxV L-N OV Delay xxx Sec

ALARM ON

Down Enter

Back

Up Down EnterBack

Up Down

EnterBack

Up Down

EnterBack

Up Down EnterBack

Down

Enter

Back

Down Enter

Back

UV and OV Notes:

The Neutral screen does not appear if the GF Type or QT-GF Type is set to Ground Return.

QT-GF Type xxxx

TO SLUGGISH

BREAKER

SETTING. SEE

NEXT PAGE.

FROM PREVIOUS

SETTING. SEE

PREVIOUS PAGE.

ST Delay options: 0.07s, 0.10s,

0.15s, 0.20s, 0.30s, 0.40s

ST Pickup can be turned OFF if Instantaneous is ON.

ST Pickup Steps: 100A Steps if CT>225A 10A Steps if CT<=225A

I2T

can be turned ON or OFF.

Instantaneous can be turned OFF if Short Time is ON.

I Pickup Range:

150% to 1200% of LT Pickup. (150% to 1200% of CT Rating if LT Pickup is OFF)

I Pickup Steps:

100A Steps if CT>225A 10A Steps if CT<=225A

Instantaneous Override and Instantaneous on Close are enabled/disabled at factory based on order code. If enabled, the settings are shown.

GF Type can be set to Residual, Return, or OFF

GF Delay options: 0.10s, 0.20s,

0.30s, 0.40s, 0.50s GF Slope can be set to

I2T, I5T, or OFF. (I5T available for 1A CT sec only)

GF Pickup steps:

10A steps for CT>225A

1.0A steps for CT<=225A

GF Pickup range for 0.5A to 2.0A CT

20% to 200% of CT Rating, 1200A Max

GF Pickup range for 0.4A CT & below

50% to 200% of CT Rating, 1200A Max

QT-GF Type If GF Type is set Residual or

Return, QT-GF Type can only match it or be turned OFF. If GF Type is OFF, QT-GF Type can be set to Residual, Return, or OFF.

QT-

I and QT-GF Pickup ranges and

steps are identical to I and GF

ranges and steps listed above.

These screens only appear if the optional Voltage Divider Module (VDM) is connected.

The UV and OV both have Trip and Alarm functions that can be turned ON or OFF. If the Alarm is ON, the Alarm Output Relay will be operated if a UV or OV event occurs.

NOL Pickup steps:

5A steps for CT>225A

0.5A steps for CT<=225A

NOL Pickup range for 0.5A to 2.0A CT

20% to 200% of CT Rating

NOL Pickup range for 0.4A CT & below

50% to 200% of CT Rating

NOL can be turned ON or OFF. NOL Delay range: 2.0 to 30.0

seconds. NOL Thermal Memory can be

turned ON or OFF.

The UV and OV pickup and delay settings fields are blank if both Trip and Alarm are set to OFF.

The UV and OV functions are set using Line-to-Neutral voltages.

UV Pickup range & steps:

80 to 400V L-N, 1V Steps

UV Delay range & steps:

3 to 255 Seconds, 1S Steps

OV Pickup range & steps:

125 to 500V L-N, 1V Steps

OV Delay range & steps:

1 to 255 Seconds, 1S Steps

QT-I

and QT-GF features are only active if the trip unit is installed with an AC-PRO-II QUICK-TRIP switch module.

ST Pickup Range: 150% to 1200% of LT Pickup. (150% to 1200% of CT Rating if LT Pickup is OFF)

ST Pickup cannot be set above Inst Pickup.

I Pickup cannot be set below ST Pickup.

If OV Trip or Alarm are ON, the highest UV Pickup setting available is 12V below OV Pickup.

If UV Trip or Alarm are ON, the lowest OV Pickup setting available is 12V above UV Pickup.

SEE SECTION 6.0 FOR MENU NAVIGATION AND TABLE 6-A FOR COMMON SMART BUTTON ACTIONS.

Figure 11.3: Change Settings Menu - Part 2

Page 23

AC-PRO-II® Instruction Manual www.utilityrelay.com

Alarm Relay Operate On LT Pickup OFF

Internal Error

Actuator Open OFF

Trip OFF

OFF

Alarm Relay Operate On Sluggish Breaker OFF UV (see UV screen) OV (see OV screen)OFF

OFF

The UV and OV alarms are set at the UV and OV screens.

The UV and OV options only appear if Voltage Divider Module (VDM) is connected.

Enter

52b

Breaker Position

(Norm. open = 52a)

Contact Type

Up Down EnterBack

Up Down Enter

Back

52a Back

(Norm. closed = 52b)

Setting OFF

Save

Exit Back

Save Settings?

Settings Saved

PLEASE REVIEW AND

REV

VERIFY SETTINGS.

REVIEW SETTINGS SEQUENCE

(REVIEW CT

TAP SCREEN)

MAIN

"READINGS"

SCREEN

Sluggish Bkr Setting

S-BKR-CLRT xx msec

Clearing Times over setting are recorded as "Sluggish" trips.

Sluggish Breaker Range 20msec to 80msec. Default setting is 33 msec.

Up Down EnterBack

This will be logged & time stamped as a "Settings Change".

FROM PREVIOUS

SETTING. SEE

PREVIOUS PAGE.

The Alarm Relay is set to operate for an event (i.e. LT Pickup) if setting is "ON".

Trip clearing times greater than setting will be logged in Trip History and will cause Alarm relay operation if set to operate for Sluggish Trips.

If a Breaker contact is not wired into the trip unit, set to OFF. If a Breaker contact is wired into

the trip unit, select 52a if the contact is open when the breaker is open. Select 52b if

the contact is closed when the breaker is open.

SEE SECTION 6.0 FOR MENU NAVIGATION AND TABLE 6-A FOR COMMON SMART BUTTON ACTIONS.

NOTE: If Breaker contact is set to OFF, Sluggish Breaker detection feature will use "Zero Current" method. If Breaker contact is set to 52a or 52b, Sluggish breaker detection feature will use the "Breaker Contact" method. See Section 10.0

NOTE: Breaker contact setting (3 screens down) determines method of Sluggish Breaker detection. See below.

Figure 11.4: Change Settings Menu - Part 3

Page 24

AC-PRO-II® Instruction Manual www.utilityrelay.com

**** NOTE ****

Instantaneous to be set to OFF at the same time.

**** NOTE ****

Instantaneous to be set to OFF at the same time.

11.4 Security Code

11.5 CT Tap

11.6 CT Secondary Rating

11.7 Power Flow Direction

11.8 Frequency

11.9 Long Time (LT)

11.10 Thermal Memory

11.11 Short-Time (ST)

11.12 Instantaneous (I)

The security code is the last four (4) digits of the serial number. See Section 4.0 for location of serial number. See Figure 11.2.

After the Security Code is entered, the first setting is the CT Tap (rating) in amps. The CT tap can range from 50 amps to 5,000 amps in 25 amp steps.

The CT rating entered into the trip unit must correspond to the actual rating of the phase and neutral CT taps. See Figure 11.2.

The CT secondary rating settings are entered in Amps and must correspond to the actual CT ratings. See Figure 11.2.

The Phase CT secondary rating is set in Amps with the following setting options:

1.0, 0.5, 0.4, 0.25, 0.20, 0.18 Amp

The Neutral CT secondary rating is set in Amps with the following setting options:

2.0, 1.5, 1.0, 0.5, 0.4, 0.25, 0.20, 0.18 Amp

Note: the 0.18 CT secondary rating is an abbreviated representation of 0.185. The associated settings and performance are based on 0.185.

The power flow direction setting only applies when a VDM is connected. When the CT wiring polarity matches Figure 5.3, the power flow direction shoul d be set to “NORMAL”. When the CT wiring polarity is the opposite of Figure 5.3, the power flow Direction should be set to “REVERSE”.

Note: This setting affects the KVA and KVAHr values displayed by the trip unit. See Section 13.0.

Set the AC-PRO-II frequency to match the power system frequency. The setting options are 50 Hertz and 60 Hertz. See Figure 11.2.

The Long Time (LT) settings screen includes the following settings: Enabled (ON or OFF), pick-up, delay, and thermal memory.

See Figure 11.2 for Long Time protection settings notes, ranges, steps, and options.

Long Time (LT) protection is ON, unless the trip unit is ordered with the “LT can be turned OFF” option.

Please note that the LT trip time is not a constant value, but is a function of breaker current. For lower currents the trip time is longer, and for higher currents the trip time is shorter. See Figure 18.1 for Time Current Curve.

See Section 18.1 for LT Trip Times.

The AC-PRO-II trip unit has a thermal memory feature for the following protective functions: Long Time (LT) (set at Long Time screen) Short Time (ST)

Ground Fault (GF) (always on) Neutral Overload (set at Neutral Overload screen)

The thermal memory feature for LT and ST can be turned on or off at the LT screen. See Figure 11.2.

Thermal memory for the GF function is always on and cannot be turned off. The GF thermal memory feature

provides protection against “sputtering” ground faults.

Except for unusual conditions, it is recommended that the thermal memory feature for LT and ST should be turned on.

Cycling overloads that are not above the LT Pick-Up long enough to cause a trip can still lead to thermal damage to wiring and equipment. With thermal memory turned on, a cycling overload can still produce a LT trip to protect cables and equipment even if any individual overload event did not persist long enough to directly cause a LT trip.

With thermal memory turned off, an overload that drops below the LT Pick-Up wil l reset the LT trip register. If the current goes above the LT Pick-Up again, the LT trip register starts from zero.

The Short Time (ST) settings screen includes the following settings: enabled (ON/OFF), pick-up, delay, and I (ON/OFF).

See Figure 11.3 for ST protection settings, notes, ranges, steps, and options.

The trip unit does not allow setting both the ST and

See Figure 18.1 for the Time Current Curve. See Section 18.2 for ST Trip Times.

The Instantaneous (I) settings screen includes the following settings: enabled (ON/OFF) and pick-up.

Figure 11.3 for Instantaneous settings, ranges, and steps.

The trip unit does not allow setting both the ST and

See Figure 18.1 for the Time Current Curve. In addition, the Instantaneous s ettings sc reen displ ays t he

Instantaneous override and Instantaneous-on-close features if they are enabled. These features are fixed and set at the factory. See below:

T ramp

Page 25

AC-PRO-II® Instruction Manual www.utilityrelay.com

**** NOTE ****

avoid nuisance GF trips.

**** NOTE ****

functions will provide protection for these currents.

**** CAUTION ****

5000A CTs & larger that use 0.2A or 0.18A CTs.

**** IMPORTANT ****

html

**** NOTE ****

for NOL protection.

11.13 Ground Fault (GF) Protection

11.14 Neutral Overload (NOL) Settings

11.15 QUICK-TRIP® Instantaneous (QT-I)

11.16 QUICK-TRIP Ground Fault (QT-GF)

Instantaneous Override (I-OVRD): The AC-PRO-II is configured at the factory with this feature either ON o r OFF. If the feature is ON, a fixed Instantaneous pickup of 12 times the CT rating is applied. In some applications, this feature is enabled at the factory to protect the specific breaker this trip unit is paired with. Additionally, this feature can be enabled if requested at the time of order. Unless specified or specifically required to protect the breaker, AC-PRO-II trip units are normally configured with this feature OFF.

Instantaneous-on-Close (I-CLOS): The AC-PRO-II is configured at the factory with this feature ON or OFF. If this feature is ON, a fixed Instantaneous pickup of 12 times the CT rating is applied for only the first 10 cycles (166ms for 60Hz, 200ms for 50Hz) after the trip unit is powered up. Unless specified at the time of order, AC-PRO-II trip units are normally configured with this feature ON.

Note: When AC-PRO-II is configured with a Voltage Divider Module (VDM), the VDM will provide trip unit power when the line side of the breaker is energized, even when the breaker is open. If the trip unit is already powered by the VDM, the I-CLOS feature does not apply.

Note: The AC-PRO-II uses a unique algorithm to determine if RMS currents greater than 12 times the CT rating are present, in which case the CTs may be saturated. The AC-PRO-II then corrects the effect of CT saturation on the LT and ST trip functions.

The AC-PRO-II features redundant Instantaneous protection. The primary Instantaneous is an analog peak-detecting circuit that directly trips the actuator, regardless of the state of the microprocessor. The microprocessor provides digital backup Instantaneous protection for the analog circuit.

The Ground Fault screen includes the following settings: GF type, pick-up, delay, and slope.

GF type can be set to residual, ground return, or OFF) The residual GF method calculates a vector sum of the three phase currents (and neutral current if applicable) and determines the fundamental frequency component. The ground return method is used for applications where a ground return CT directly measures the GF current, and the AC-PRO-II calculates the fundamental value. See Section 5.1.1 for typical wiring diagrams of the two ground fault methods.

Figure 11.3 for Ground Fault settings notes, ranges, steps,

and options. See Figure 18.2 for Ground Fault Time Current Curve.

On a 4-wire system, a neutral CT must be installed to

Due to possible CT saturation, RMS currents greater than 12 times the CT rating are not considered in the GF protection calculations. The ST and/or Instantaneous

24VDC Aux Power is required for GF protection with

To implement GF protection on the main breakers and the tie breaker of a double ended 4-wire substation, see the following Technical Bulletin:

http://www.utilityrelay.com/Side_Bar/Technical_Bulletins.

The neutral overload (NOL) screen includes the following settings: enabled (ON/OFF), pick-up, delay, and NOL thermal memory.

Figure 11.3 for NOL settings notes, ranges, steps, and

options. See Figure 18.2 for the NOL Time Current Curve (TCC). The NOL thermal memory feature operates the same as the

LT and ST thermal memory feature. See Section 11.10 for a description.

Neutral Overload (NOL) protection cannot be enabled if the Ground Fault (GF) type is set to ground return. This is because with the ground return method, the neutral CT input is used for GF protection and thus cannot be used

This setting only applies if the AC-PRO-II QUICK-TRIP switch module is installed and connected. See Section

7.0 for details.

The QT-I pickup range and steps are the same as the Instantaneous pickup range and steps.

See Figure 18.4 for the QUICK-TRIP Time Current Curves (TCC).

The QT- I function does not have an OFF setting. It is turned ON or OFF using the QUICK-TRIP ON-OFF selector switch. If the AC-PRO-II QUICK-TRIP switch module is not installed, then this function is always off.

This setting only applies if the AC-PRO-II QUICK-TRIP switch module is installed and connected. See Section

7.0 for details.

The QUICK-TRIP GF feature has two settings: QT-GF type and QT-GF pick-up.

If GF type is set to OFF, QT-NG type can be set to residual, return, or OFF. If GF type is set to residual or return, the QT-GF type can only match it or be turned OFF.

The QT-GF pick-up range and steps are the same as the GF pickup range and steps.

See Figure 18.4 for the QUICK-TRIP Time Current Curves (TCC).

Page 26

AC-PRO-II® Instruction Manual www.utilityrelay.com

**** IMPORTANT ****

2. The Phase A-to-B voltage must be greater than 90V.

**** IMPORTANT ****

UnderVoltage function is not “Phase Loss” protection.

**** IMPORTANT ****

function on Non-solidly grounded systems.

**** IMPORTANT ****

function on Non-solidly grounded systems.

11.17 Undervoltage (UV)

11.18 Overvoltage (OV)

11.19 Sluggish Breaker Setting

11.21 Breaker Position Contact Type Setting

11.22 Saving Settings

The following steps are recommended for determining the

This setting only applies if the AC-PRO-II is installed with the optional Voltage Divider Module (VDM).

The Undervoltage (UV) function of the AC-PRO-II utilizes Line-to-Neutral voltage and a definite time delay, to provide three-phase UV protection.

The UnderVoltage (UV) function uses voltage magnitude only, which provides “brownout” protection. “Brownouts” are when system voltage is still present, but the voltages are lower than the nominal system voltage. UnderVoltage protection is not intended to be “Phase Loss” protection and will not operate reliably in the event of a total phase loss, or total system outage. This is because voltage can still be present on the “lost” phase, from the “regenerated voltage” or “back EMF” from 3-phase motors operating on a single phase source.

Figure 11.3 for Undervoltage settings notes, ranges, steps,

and options. The UV function is disabled under the following conditions:

- If a Secondary Injection Test set is connected.

- If the AC-PRO-II is on battery power only or USB power only

- If (2) Phase currents are “LOW” and (1) Phase current is not “LOW”.

- After a UV trip, repeated UV trips are blocked until current is re-established.

For Undervoltage trips and alarms to occur, the following conditions must be present:

1. At least (2) phase currents must be greater than 10% of the CT rating.

The Undervoltage function will not operate in the event of a total phase loss or total system outage. The

Use caution when using the Undervoltage (UV) Trip

Sluggish Breaker setting on a recently serviced breaker with a mechanism in good operating condition:

1. Perform primary Injection to initiate a ST or LT trip; or use the SAFE-T-TRIP device to initiate a trip. If using SAFE-T-TRIP on a breaker that does not have primary current flowing through it, a 52a or 52b contact must be wired to AC-PRO-II.

2. Use the trip history menu to review the recorded breaker mechanism times of the trip initiated in step 1 above. The breaker mechanism times should be in the 20ms to 80ms range. The total trip time (different than breaker mechanism time) should conform to the Time Current Curve in Figure 18.1.

3. URC recommends setting the Sluggish Breaker time to be 17ms great er t han the recorded mechanism time from step 2.

See Figure 11.4 for Sluggish Breaker setting screen. See Section 10.0 for additional information about the

Sluggish Breaker feature.

11.20 Configurable Alarm Relay Settings

The alarm relay configuration occurs via two alarm relay settings screens, where the alarm relay can be set to operate for any combination of events. If the setting is “ON”, the relay will operate for that particular event/condition. See Figure 11.4 for alarm relay settings options and notes.

Refer to Section 5.3.1 and Table 5-A for additional information about the configurable alarm relay.

If a breaker position contact is wired to the AC-PRO-II, the contact type is set at this screen. If the breaker contact is open when the breaker is open, select 52a. If the breaker contact is closed when the breaker is open, select 52b. If a breaker contact is not wired into the trip unit, this setting should be OFF. See Figure 11.4.

Note that this setting affects the Sluggish Breaker detection method. See Section 10.0.

This setting only applies if the AC-PRO-II is installed with the optional Voltage Divider Module (VDM).

The Overvoltage (OV) function of the AC-PRO-II utilizes Line-to-Neutral voltage and a definite time delay, to provide three-phase OV protection.

Figure 11.3 for OV settings notes, ranges, steps, and

options. The OV function is disabled under the following condition:

- After an OV trip, repeated OV trips are blocked until current is re-established.

Use caution when using the Overvoltage (OV) Trip

The Sluggish Breaker setting range is 20ms – 80ms. The default setting is 33ms.

Once the last setting is entered, the “Save Settings?” screen will appear. The save settings screen also provides a reminder that if the “Save” button is pressed, the settings will be saved, logged, and time stamped as a “Settings Change”. The settings change time stamp is stored and available via Modbus communications.

Pressing “Exit” will return to the Main screen. Pressing “Back” will return to the previous setting screen.

11.23 Settings Verification

Once the settings are saved, the “REV” and “OK” buttons are available at the “Settings Saved” screen.

Pressing “REV” will lead to the review settings sequence. Pressing “OK” will lead to the main screen.

To complete the entering or changing settings process, press “REV” to review and confirm all settings entered.

The settings review sequence is very similar to the settings change sequence, except the settings are only viewed and cannot be changed. The existing settings are viewed and navigated with the “Next” and “Back” buttons. See below and Figure 6.2.

Page 27

AC-PRO-II® Instruction Manual www.utilityrelay.com

ENTER

RS485 Communications Enabled

Baud Rate 9600 Parity None

Address 1

The left buttons are for

setting adjustments. These buttons change depending on setting options. i.e. "Up/Down" or "ON/OFF".

ON OFF Back

PWR SET HIST MORE

N: GF:

xxxxA xxxxA xxxxA xxxxA xxxxA

xxxVan xxxVbn xxxVcn

A: B: C:

REV CHNG 485 EXIT

"EXIT" to Exit

**SETTINGS**

"485" to change 485

"CHNG" to Change

"REV" to Review

SAVE

RS485 Communications Forced Trip

Down Back

Options are ENABLE &

DISABLE

Settings Change Over Comm

DISABLE

Note: Settings changes always allowed locally and via USB. Settings over RS-485 allowed if "Settings Change Over Comm" is ENABLED.

Enabled

Baud Rate Parity

Address

ON or OFF 1 - 247 9600 or 19200 Odd, Even, or None

o o o

11.24 Settings Review

11.25 Time & Date Settings

11.26 Communications Settings

Settings can also be changed, reviewed, saved, and printed using the InfoPro-AC software application.

To Setti ngs

Review Sequence.

Figure 11.5: Settings Screen - Review Button

See Figure 6.2 for the settings review sequence.

See Section 6.4.1 for the time & date Settings. NOTE: It is important to set the time & date for time stamping of events.

The AC-PRO-II is capable of communicating over an RS485 network via Modbus RTU protocol. The RS485 communications screen includes the following settings:

Communications Enabled: Set to ON if RS485 communications is desired.

Address: Each trip unit that shares the same twisted pair must have a unique address. The address identifies each individual trip unit connected to the same twisted pair.

Note: two trip units can have the same Address as long as they are not connected to the network via the same twisted pair cable.

The address is selectable from 1 to 247, in increments of 1. In most applications, only addresses 1 through 32 will be used due to the limitations of RS485 communications.

Baud Rate should be selected to match the baud rate of the master communicating device (i.e. PC, gateway, etc.).

Parity should be set to match the parity of the master communicating device (i.e. PC, gateway, etc.).

Forced Trip: If enabled, this feature permits tripping of the breaker via a forced trip command over RS485 communications.

Settings Change Over Communications: If enabled, this feature permits the user to make settings changes via the communications network. Otherwise, settings can only be changed at the AC-PRO-II using the smart buttons or using the local USB connection. NOTE: The CT settings can only be changed at the AC-PRO-II.

See Figure 11.6 for setting options and Section 24.0 for additional Communications information.

Figure 11.6: Communications Settin gs

Page 28

AC-PRO-II® Instruction Manual www.utilityrelay.com

12.0 Trip History

The AC-PRO-II stores the trip data for the last 8 trip events. The stored trip data includes the following:

1. Trip counts

2. Trip type (see Table 12-A for types)

3. Time stamp (date and time).

4. Trip number (1-8, assigned by trip unit) (if trip is the “Last trip”, this will be identified on the screen).

5. Phase currents and voltages

6. Neutral and ground currents

7. Breaker clearing tim e for each phase

8. Waveforms can be viewed using InfoPro-AC

This data can be accessed using the Trip History Menu. See Figure 12.1.

NOTE: The date and time must be set properly, and a fresh battery must be installed to ensure accurate trip history date and time stamps.

Abbreviation

software application only. See Section 23.0.

Trip Type

LT Long Time ST Short Time

I Instantaneous

I-OVRD Instantaneous Override

I-CLOS Instantaneous on Close

GF Ground Faul t NOL Neutral Overload QT-I QUICK-TRIP Instantaneous

QT-GF QUICK-TRIP Ground Fault

UV Under V ol tage

OV Over Voltage

Trip Type Description

Table 12-A: Trip Types

The trip history data, including the associated waveform capture data, can be viewed, saved and printed using the InfoPro-AC software application. All tri p unit data is also available via RS485 Modbus RTU communications.

To ensure accurate recording of breaker clearing times, and proper Sluggish Breaker contact user setting must be set properly. See Sections 10.0 and 11.21.

The AC-PRO-II uses multiple methods to determine trip currents and voltages. However, some Instantaneous trips may occur too rapidly for AC-PRO-II to report RMS trip values. For these trips, AC-PRO-II will report “> Pickup value” for the current values for all three phases.

See Figure 12.1 for the trip history screens navigation map.

Detection, the breaker position

Page 29

AC-PRO-II® Instruction Manual www.utilityrelay.com

MENU NAVIGATION MAP

TRIP HISTORY MENU

PWR

SET HIST MORE

GF:

xxxxA xxxxA xxxxA xxxxA xxxxA

xxxVan xxxVbn xxxVcn

A: B: C:

Rev Clear More Exit

Trip History Screen 1 ST XXX LT XXX GF XXX QT-I XXX QT-GF XXX

I XXX I-OVRD XXX I-CLOS XXX NOL

Trip History Screen 2 SAFE-T XXX FORCED XXX

OV XXX UV XXX

Clear Exit Back

Trip Review Type: ST MM/DD/YYYY

Next More Exit

hh:mm:ss AM/PM Trip Number = #x ****> LAST TRIP <****

Back

WARNING

All trip data will be erased! Press

Erase

"Erase" to confirm.

MoreBack Exit

xxxxxA xxxVan xxxxxA xxxVbn xxxxxA xxxVcn xxxxxA GF: xxxxxA

A: B: C:

Trip x: (Trip Type)

Back Exit

xx.x msec xx.x msec xx.x msec

A: B: C:

Trip x: (Trip Type) Bkr Clearing Time:

The Previous and Next buttons allow access to additi onal Trips if they exist. The More button displays addi t i onal data about this specific trip.

Rev

This will be the first screen displayed (after any Alarm screen(s), if appilcable) after a trip occurs.

***SLUGGISH BREAKER***

"SLUGGISH BREAKER" message will display

only if Clearing time is greater than the user setting.

The Voltage values and "PWR" button only appear if the optional Voltage Divider

Module (VDM) is connected.

Back to Trip

History Screen

XXX

Breaker clearing time. Displays "N/A" if Breaker clearing time could not be determined.

Press HIST to access

Trip History Menu

o o o

If Current is above 12 times the CT rating, "> 12 x CT" wi l l be displayed.

Trip Values Notes:

The Voltage values will only be displaye d if the optional

VDM is connected.

To Alarm Relay screen if Alarm is set to operate for trips.

Press "Rev" for "Trip Review" (additional Trip History detail), starting with Last Trip.

Trip History Screen 1 displays trip counts.

Trip History Screen 2 displays addi tional

trip counts.

Press More for trip

currents and voltages.

Trip Review screen 1 shows Trip type, tim e stamp, assigned trip number, and identifies if it was the Last Trip.

Press More for breaker clearing

times.

Exit

No Trips exist

in Trip History

If no Trips exist in Trip History,

this screen is displayed.

Some Instantaneous trips occur too rapidly for

AC-PRO-II to report RM S trip values. For these trips, "> pickup value" is displayed for all three phases.

Figure 12.1: Trip History Menu

Page 30

AC-PRO-II® Instruction Manual www.utilityrelay.com

**** NOTE ****

10 sec).

13.0 Normal Operations & Readings

14.0 Testing

14.1 Commission the Trip Unit

14.2 Long Time Trip Test

During normal operation, the trip unit display screen will be off and in its power saving mode. See Section 3.0 for trip unit power information. When the “DISPLAY” button is pressed during normal operation (no trips, errors, alarms, etc), the trip unit will display current and line-to-neutral voltage (if equipped with VDM) readings. The neut ral and GF currents will only be displayed if neutral or GF protective functions are turned on. See below. The “XXXX” digits will display actual readings.

Figure 13.1: Main (“Readings”) Screen

• The left column displays Currents in Amps for Phases A, B, C, Neutral and Ground Fault.

• The right column displays Line-to-Neutral Voltages

Breaker Current Less than 10% of CT Rati ng:

When the currents are less than about 10% of the CT rating, the display will display “LOW” for currents.

Breaker Current Greater than 10% of CT Rating:

If the breaker current is greater than about 10% of the CT rating, the current readings will be displayed.

Line-to-Neutral Voltages (if equipped with VDM):

“LOW” will be displayed if the Line-to-Neutral voltage is 50V or below. “N/A” will be displayed if the Voltage cannot be determined, most likely because system voltage (i.e. 480V) is not present at the VDM.

Note: If voltages and voltage labels (“Van, Vbn, Vcn”) do not display, the AC-PRO-II is either not equipped with a VDM, or the VDM is not properly connected to the AC-PRO-II. Contact URC.

for Phases A (“Van”), B (“Vbn”), and C (“Vcn”).

• KWHr = KiloWatt-Hours (real power usage)

• KVAHr = KiloVolt-Ampere-Hours (apparent power

usage)

Instantaneous Power Values (if equipped with VD M):

• “LOW” is displayed for the per-phase KW and KVA values if an associated phase current or voltage is “LOW”.

• “N/A” will be displayed for the per-phase KW and KVA values if the Voltage on the associated phase cannot be determined, most likely because system voltage (i.e. 480V) is not present at the VDM.

• The ∑ symbol represents the three phase power totals. If a particular phase is “LOW”, then zero is included for that phase in the three-phase sum.

• “PF” is the total Power Factor calculation.

• The KW values are affected by the direction of the power

flow, and the Power Flow Direction user setting. See Section 11.7.

Energy Values (if equipped with VDM):

• Energy values increment if the current for a particular phase is above 3% of the CT rating and the phase voltage is above 50V.

• The KWHr value increments and decrements depending on the power flow direction and Power Flow Direction user setting. See Section 11.7.

• The KVAHr value only increments.

• Note: Energy values can increment even when the

Instantaneous Power values displayed are “LOW”

A "primary injection" test is recommended as the final test of the AC-PRO-II retrofit.

If residual GF is used, it must be temporarily turned off when testing the other trip functions.

Before proceeding with the normal primary injection tests, the trip unit must be commissioned to make it functional. See Section 11.0 for the commissioning procedure.

It is best to use the final pick-up and time delay settings if they are known. If not, use typical settings for the primary injection test.

Figure 13.2: Power Screen #1:

Instantaneous Power

• The left column displays real power in Kilowatts (KW) per phase, total (∑ KW), and Power Factor (PF).

• The right column displays apparent power KiloVoltAmperes (KVA) per phase and total (∑ KVA).

Figure 13.3: Power Screen #2: Energy

If residual GF is used, make sure it is temporarily turned off. To test the LT Pick-Up, increase the current until the “Pick-

Up” LED illuminates. The injected current should correspond to the programmed

LT pick-up setting. Verify that the correct phase is indicated on the display.

To tes t t he LT trip time, first calculate t he trip tim e based on the value of the test current that will be applied. Use the formula in Section 18.1 or the chart in Section 15.3.

A simple shortcut is to note that the trip time (center of the curve) at 3 times the LT pick-up current is 4 times the LT Delay setting.

For example:

If LT Pick-Up is 1600A and Delay is 10.0S, then the trip time at 4800A (3 times 1600A) is 40 sec. (4 times

Page 31

AC-PRO-II® Instruction Manual www.utilityrelay.com

**** NOTE ****

section 11.12 for I-CLOS description.

**** NOTE ****

20 sec).

**** NOTE ****

be powered via 24VDC or the USB port.

14.3 Short Time Trip Test

14.4 Instantaneous Trip Test

14.5 Neutral Overload (NOL) Trip Test

14.6 Ground Fault Trip Tests

14.6.1 Residual Ground Fault Trip Test

14.6.2 Ground Return Fault Trip Test

14.7 QT-GF Trip Test

14.8 CT Phasing Test for GF

If residual GF is used, make sure it is temporarily turned off. To test the ST pick-up, temporarily set ST I

short pulse of current that is 10% or 20% less than the ST pick-up setting. Continue applying short pulses of current while increasing the current for each pulse until a ST trip occurs. The first current where a ST trip occurred is the ST pick-up.

To test the ST delay, turn ST I apply a current that is at least 10% greater than the ST pickup current.

The trip time should fall within the time band shown on the Time-Current-Curves.

To bypass Instantaneous-on-Close (I-CLOS) when primary injection testing at high currents, power the AC-PRO-II prior to applying current using USB power via a laptop or a mini-USB wallpack. See

If residual GF is used, make sure it is temporarily turned off. Test the Instantaneous pick-up and trip time in the same

manner as ST in Section 14.3.

If residual GF is used, make sure it is temporarily turned off. If Ground Return GF is used, NOL cannot be used. To perform a primary injection test of the NOL function,

temporarily shift the Phase C CT secondary wires to the neutral CT input terminals on the AC-PRO-II. Connect a laptop, PC, or USB wallpack to the front mini-USB port of the display to power the trip unit. Primary injection into Phase C will simulate neutral current. If this testing method is not preferred, the NOL function can be tested using the Secondary Injection Test Set. See Section 15.0.

Test the Neutral Overload Pick-up and trip time in the same manner as LT in Section 14.2.

Refer to Neutral Overload formula in Section 18.4.

A simple shortcut is to note that the trip time (center of the curve) at 3 times the NOL pick-up current is 4 times the NOL Delay setting.

For example:

If NOL Pick-Up is 2000A and Delay is 20.0S, then the trip time at 6000A (3 times 2000A) is 80 sec. (4 times

Only Phase current will power the AC-PRO-II. When doing

primary injection testing of the NOL, the AC-PRO-II must

T on again (if applicable) and

T off and apply a

When the AC-PRO-II is set f o r residual GF protection, the trip unit calculates ground fault current.

With GF Pick-Up and Delay set to the required values, primary injection testing any one of the three poles will provide a GF trip.

Test the GF Pick-Up and trip time in the same manner as ST in Sec tion 14.3.

When the AC-PRO-II is set f o r ground return GF protection, the neutral current input is used for direct measurement of the GF current.

To perform a primary injection test of ground return GF protection, temporarily shift the Phase C CT secondary wires to the Neutral CT input terminals on the AC-PRO-II. a laptop, PC, or USB wallpack to the front mini-USB port of the display to power the trip unit. Primary injection into Phase C will simulate ground return current. method is not preferred, the ground return GF func tion can be tested using the Secondary Injection Test Set. See Section 15.0.

Test the GF pick-up and trip time in the same manner as ST in Sec tion 14.3.

To tes t QT-GF the AC-PRO-II QUICK-TRIP switch module must be connected to the trip unit as shown in Figure 7.1.

With QT -GF pick-up set to the required value and the QUICK-TRIP selector switch turned to the on position, testing any one of the three poles will provide a QT-GF tri p.

Test the QT-GF pick-up and trip time in the same manner as the normal GF function.

Proper breaker CT polarity is always recommended, and is required for residual GF and residual QUICK-TRIP GF protection. Without proper CT polarity wiring, a nuisance GF trip will probably occur. With the breaker in service on a

3-phase system, the last trip data with a reversed polarity phase CT will show the GF current magnitude as approximately two times the phase current of the CT connected in reverse polarity.

Since primary injection testing normally tests only one phase at a time, a breaker CT with reversed polarity will not be detected with the normal tests. By using the following method, a primary injection test set can be used to test for proper CT polarity.

Connect

If this testing

Page 32

AC-PRO-II® Instruction Manual www.utilityrelay.com

To Test Set

Breaker

Jumper load side of Phase A & B poles

"A" "B" "C"

CTs

Apply current slightly greater

If Phase A & B phasing match, a GF trip will not occur.

than GF Pick-Up to the breaker line side.

To Test Set

"B""A"

Jumper load side of Phase B & C poles

Breaker

CTs

than GF Pick-Up to breaker line side.

a GF trip will not occur.

If Phase B & C phasing match,

Apply current slightly greater

"C"

From Primary Injection

"A" "B" "C"

CTs

  

Current Test Set

From Voltage Source

"Hot" Neutral

    





AC-PRO-II

VDM Voltage Divider Module

A B C G

**** IMPORTANT ****

UnderVoltage function is not “Phase Loss” protection.

14.9 QT-I Trip Test

14.10 Undervoltage (UV) Test

Figure 14.1 and Figure 14.2 breaker CT polarities match. The setup in Figure 14.1 verifies that the CT polarities of Phase A and Phase B match. The setup in Figure 14.2 verifies that the CT polarities of Phase B and Phase C match.

It is only necessary to inject a current slightly greater than the GF Pick-Up setting and to verify that a GF trip does not occur.

show a method to verify that the

To test the UV trip or alarm function, a primary injection current test set, a voltage source, and a timer is needed.

Since both a current test set and a voltage source will be used, ensure the AC-PRO-II voltage connections are isolated from the breaker poles by removing the fuses from the fuse block that feeds the VDM (Voltage Divider Module). Make the temporary testing connections shown in Figure

14.3. The voltage source can be 120VAC (voltage must be at least 90VAC). Verify that the Phase A voltage is indicated on the display. Reminder: voltage measurement and settings are for Line-to-Neutral voltages (i.e. 277V is the Line-Neutral voltage on a 480V 3-phase system).

The UV delay feature can be tested with a timer. The UV function is “definite time”, so the delay remains the same regardless of the severity of the undervoltage.

Figure 14.1: Phase A & B, CT Polarity Test

Figure 14.2: Phase B & C, CT Polarity Test

If a GF trip does occur, determine which CT has the reversed polarity. Reverse the secondary connections at the CT to correct the reversed polarity.

The breakers shown in the Figures above have the CTs on the load side. Use exactly the same method if the CTs are on the breaker line side or if they are staggered.

If a neutral CT is used, its polarity must match the polarity of the breaker mounted CTs.

To tes t QT-I the AC-PRO-II QUICK-TRIP switch module must be connected to the trip unit as shown in Figure 7.1.

With QT - I pick-up set to the required value and the QUICK-TRIP selector switch turned to the on position, test all three breaker poles in the same manner as the normal Instantaneous function.

Figure 14.3: Undervoltage Test temporary

connections

Undervoltage Test Notes:

1) In additi on to the voltage source, current m ust be above 10% of the CT rating on any two phases for a UV Trip or Alarm to occur.

2) UV is disabled if a Secondary Inject i on Test Set is connected.

3) Aft er a UV trip occurs, repeated UV tri ps are blocked until current is re-established.

4) If a UV alarm occurs, it is latched and must be reset using the display and push buttons.

5) Refer to Section 11.17 for additional Undervoltage information.

The Undervoltage function will not operate in the event of a total phase loss or total system outage. The

Undervoltage Test Procedure:

1) Set the AC-PRO-II UnderVoltage Trip or Alarm setting to ON.

2) Apply 120VAC across t erminals A & B. (must be at least 90VAC)

3) Apply current greater than 10% of the CT rating on two phases and start the timer.

NOTE: as soon as current is applied to any two phases, the AC-PRO-II internal UV pickup timer will start since the voltages applied to Phases B & C are both “Low”.

4) The UV trip or alarm should occur within +/- 0.25 seconds of the UV time delay setting.

Page 33

AC-PRO-II® Instruction Manual www.utilityrelay.com

From Variable Voltage Source

"Hot" Neutral

    

AC-PRO-II

VDM Voltage Divider Module

A B C G

    

**** IMPORTANT ****

14.11 Overvoltage (OV) Test

15.0 Sec on dary Injection Testing

15.1 Secondary Injection Test Set

15.2 Standard Relay Test Set

To test the OV trip or alarm function, a primary or secondary injection test set, a variable voltage s ource, and a timer is needed.

Make the temporary connections shown in Figure 14.4. The maximum voltage of the variable voltage test source should be at least 10% above the programmed OV pick-up setting. Verify that the Phase A voltage is indicated on the display. Reminder: voltage measurement and settings are for Lineto-Neutral voltages (i.e. 277V is the Line-Neutral voltage on a 480V 3-phase system).

The OV delay feature can be tested with a timer. The OV function is definite time, so the delay remains the same regardless of the severity of the overvoltage.

Figure 14.4: Overvoltage Test temporary

connections

Overvoltage Test Notes:

1) Aft er an OV trip or occurs, repeated OV trips are blocked until current is re-established.

2) If an OV alarm occurs, it is latched and must be reset using the display and push buttons.

Overvoltage Test Procedure:

1) Apply voltage at least 10% below the OV Pickup setting.

2) No OV trip should occur.

3) Increase the voltage to at least 10% above the OV Pickup setting and start the timer.

4) An OV trip should occur within +/- 0.25 seconds of the OV time delay setting.

Although primary injection testing is the preferred method to test an AC-PRO-II installation, secondary injection testing can also be used.

The B-292 secondary inection test set (with blue panel) can test both the original AC-PRO and AC-PRO-II trip units. The B-291 secondary injection test set (with red panel) canot test the AC-PRO-II trip unit.

Figure 15.1

NOTE: Utility Relay Company can modify newer versions of existing AC-PRO secondary injection test sets (with red panel) to be compatible with AC-PRO-II trip units. Con ta c t Utility Relay Company for details.

Most standard relay test sets can also be used to secondary injection test the AC-PRO-II trip unit.

The following are required:

• 24VDC P ower Supply (URC Part #T-490-ASM) to power up the AC-PRO-II trip unit so that it will accept current

• Relay test set with a 0 to 12 Amp range

• True RMS amm eter in the test set or externally

connected

• Method to st op the relay test set and test set timer when the breaker trips

Test procedure:

1. Power up the AC-PRO-II trip unit with the USB power supply so it will accept current

2. Temporarily turn off GF.

3. Connect the output leads from the relay test set to the Phase “A” CT terminals (it is not necessary to disconnect the CT)

4. Proceed with pick-up and time testing of Phase “A”

5. When finished, similarly test Phase “B” & “C”

6. Turn GF on (if desired) and test by injecting current on any one of the Phases

The CT circuits are internally grounded to the AC-PRO-II case. If any of the CT wires are externally grounded, the AC-PRO-II will not read curren t correctly.

Some relay test sets have a grounded current output . To secondary injection test the AC-PRO-II trip unit with this type of test set, the AC-PRO-II trip unit must be isolated from the test set ground.

: B-292 Secondary Injection Test Set

Page 34

AC-PRO-II® Instruction Manual www.utilityrelay.com

15.3 LT Delay Testing Chart

LT Delay Trip Time

Test Current

LT Delay Trip Time

Test Current

LT Delay Trip Time Test Current

Setting

Range 3.0X 4.0X 6.0X

Setting Range

3.0X 4.0X 6.0X Setting Range 3.0X 4.0X 6.0X

Max 9.88 5.56

2.47 Max

56.79

31.94 14.20 Max 103.70 58.33 25.93

2.0

Nominal

8.00

4.50

2.00

11.5

Nominal

46.00 25.88 11.50 21.0 Nominal 84.00 47.25 21.00

Min 6.61 3.72 1.65 Min 38.02 21.38 9.50 Min 69.42 39.05 17.36

Max

12.35 6.94

3.09

Max 59.26

33.33

14.81 Max 106.17 59.72 26.54

2.5 Nominal

10.00 5.63

2.50

12.0 Nominal

48.00 27.00 12.00 21.5 Nominal 86.00 48.38 21.50

Min 8.26 4.65 2.07 Min 39.67 22.31 9.92 Min 71.07 39.98 17.77

Max

14.81 8.33

3.70

Max

61.73

34.72

15.43 Max 108.64 61.11 27.16

3.0

Nominal

12.00 6.75

3.00

12.5

Nominal

50.00 28.13 12.50 22.0 Nominal 88.00 49.50 22.00

Min 9.92 5.58 2.48 Min 41.32 23.24 10.33 Min 72.73 40.91 18.18

Max 17.28

9.72 4.32

Max

64.20 36.11

16.05 Max 111.11 62.50 27.78

3.5

Nominal

14.00 7.88

3.50

13.0 Nominal

52.00 29.25 13.00 22.5 Nominal 90.00 50.63 22.50

Min 11.57 6.51 2.89 Min 42.98 24.17 10.74 Min 74.38 41.84 18.60

Max

19.75

11.11

4.94 Max

66.67

37.50

16.67 Max 113.58 63.89 28.40

4.0

Nominal

16.00

9.00 4.00

13.5

Nominal 54.00 30.38 13.50 23.0 Nominal 92.00 51.75 23.00

Min 13.22 7.44 3.31 Min 44.63 25.10 11.16 Min 76.03 42.77 19.01

Max

22.22

12.50 5.56

Max

69.14

38.89

17.28 Max 116.05 65.28 29.01

4.5 Nominal

18.00

10.13 4.50

14.0

Nominal 56.00 31.50 14.00 23.5 Nominal 94.00 52.88 23.50

Min 14.88 8.37 3.72 Min 46.28 26.03 11.57 Min 77.69 43.70 19.42

Max

24.69 13.89

6.17 Max 71.60

40.28 17.90 Max 118.52 66.67 29.63

5.0

Nominal

20.00

11.25

5.00

14.5

Nominal

58.00 32.63 14.50 24.0 Nominal 96.00 54.00 24.00

Min 16.53 9.30 4.13 Min 47.93 26.96 11.98 Min 79.34 44.63 19.83

Max

27.16 15.28

6.79 Max

74.07

41.67 18.52 Max 120.99 68.06 30.25

5.5

Nominal

22.00

12.38

5.50

15.0 Nominal

60.00 33.75 15.00 24.5 Nominal 98.00 55.13 24.50

Min 18.18 10.23 4.55 Min 49.59 27.89 12.40 Min 80.99 45.56 20.25

Max

29.63

16.67

7.41

Max

76.54

43.06

19.14 Max 123.46 69.44 30.86

6.0

Nominal 24.00

13.50 6.00 15.5

Nominal 62.00 34.88 15.50 25.0 Nominal 100.00 56.25 25.00

Min 19.83 11.16 4.96 Min 51.24 28.82 12.81 Min 82.64 46.49 20.66

Max

32.10

18.06

8.02 Max

79.01

44.44

19.75 Max 125.93 70.83 31.48

6.5 Nominal 26.00

14.63 6.50 16.0

Nominal 64.00 36.00 16.00 25.5 Nominal 102.00 57.38 25.50

Min 21.49 12.09 5.37 Min 52.89 29.75 13.22 Min 84.30 47.42 21.07

Max

34.57 19.44

8.64 Max 81.48

45.83 20.37 Max 128.40 72.22 32.10

7.0

Nominal 28.00 15.75

7.00 16.5 Nominal 66.00 37.13 16.50 26.0 Nominal 104.00 58.50 26.00

Min 23.14 13.02 5.79 Min 54.55 30.68 13.64 Min 85.95 48.35 21.49

Max 37.04

20.83 9.26 Max

83.95 47.22 20.99 Max 130.86 73.61 32.72

7.5

Nominal

30.00

16.88

7.50 17.0

Nominal

68.00 38.25 17.00 26.5 Nominal 106.00 59.63 26.50

Min 24.79 13.95 6.20 Min 56.20 31.61 14.05 Min 87.60 49.28 21.90

Max

39.51 22.22 9.88

Max 86.42 48.61

21.60 Max 133.33 75.00 33.33

8.0

Nominal 32.00

18.00 8.00 17.5

Nominal 70.00 39.38 17.50 27.0 Nominal 108.00 60.75 27.00

Min 26.45 14.88 6.61 Min 57.85 32.54 14.46 Min 89.26 50.21 22.31

Max

41.98 23.61

10.49 Max

88.89 50.00

22.22 Max 135.80 76.39 33.95

8.5 Nominal 34.00

19.13 8.50

18.0 Nominal 72.00 40.50 18.00 27.5 Nominal 110.00 61.88 27.50

Min 28.10 15.81 7.02 Min 59.50 33.47 14.88 Min 90.91 51.14 22.73

Max

44.44 25.00

11.11 Max 91.36

51.39 22.84 Max 138.27 77.78 34.57

9.0

Nominal 36.00 20.25

9.00 18.5

Nominal 74.00 41.63 18.50 28.0 Nominal 112.00 63.00 28.00

Min 29.75 16.74 7.44 Min 61.16 34.40 15.29 Min 92.56 52.07 23.14

Max 46.91 26.39 11.73 Max 93.83

52.78 23.46 Max 140.74 79.17 35.19

9.5 Nominal 38.00 21.38 9.50 19.0 Nominal

76.00 42.75 19.00 28.5 Nominal 114.00 64.13 28.50

Min 31.40 17.67 7.85 Min 62.81 35.33 15.70 Min 94.21 53.00 23.55

Max

49.38 27.78

12.35 Max 96.30

54.17 24.07 Max 143.21 80.56 35.80

10.0

Nominal 40.00 22.50

10.00 19.5

Nominal 78.00 43.88 19.50 29.0 Nominal 116.00 65.25 29.00

Min 33.06 18.60 8.26 Min 64.46 36.26 16.12 Min 95.87 53.93 23.97

Max 51.85 29.17 12.96 Max 98.77 55.56

24.69 Max 145.68 81.94 36.42

10.5 Nominal 42.00 23.63 10.50 20.0

Nominal 80.00 45.00 20.00 29.5 Nominal 118.00 66.38 29.50

Min 34.71 19.52 8.68 Min 66.12 37.19 16.53 Min 97.52 54.86 24.38

Max 54.32 30.56

13.58 Max 101.23 56.94

25.31 Max 148.15 83.33 37.04

11.0 Nominal 44.00

24.75 11.00 20.5 Nominal 82.00 46.13 20.50 30.0 Nominal 120.00 67.50 30.00

Min 36.36 20.45 9.09 Min 67.77 38.12 16.94 Min 99.17 55.79 24.79

This chart provides trip times in Seconds for the LT delay settings at 3.0X, 4.0X and 6.0X where “X” is in multiples of the LT pick-up setting.

The Maximum, Minimum and Nominal trip times are given for each LT delay setting and the three listed test currents.

The Time-Current Curves in Figure 18.2 along with the equations in Section 18.1 can be used to determine the trip times of the other trip functions.

Page 35

AC-PRO-II® Instruction Manual www.utilityrelay.com

Push

Verify

Quick-Trip ON

Quick-Trip OFF

Quick-Trip ON

Quick-Trip Switch

Arc Flash Hazard Reduction Switch

(only for use with AC-PRO-II trip unit)

4.25"

2.168"

3.155"

Quick-Trip Switch Side View

Quick-Trip Switch Front View

0.83"

1.33"

2.83"

5.0"

3.5"

3.25"

2.28"

1.52"

0.76"

0.77"

0.75"

AC-PRO-II w/ VDM

AC-PRO-II

w/o VDM

VDM

Main Case

Display Case

AC-PRO-II Side View

AC-PRO-II Front View

AC-PRO-II Isometric View (shown with optional VDM)

15.4 Neutral Overload Testing Chart

16.0 Ratings & Physical Information

The LT testing chart in previous section can also be used for NOL testing.

Ambient Temperature: T ri p Uni t:

-4°F (-20°C) to 158°F (70°C)

T ri p Uni t with Voltage Di vider Module (V DM):

Serial #0142800497 and above:

-4°F (-20°C) to 158°F (70°C) Serial #0142800497 and below:

-4°F (-20°C) to 140°F (60°C)

O LE D Displ ay:

-22°F (-30°C) to 185°F (85°C)

Battery:

-40°F (-40°C) to 158°F (70°C)

Humidity: 95% non-condensing

Conformal Coating (on circuit boards):

Acrylic conformal coating, HumiSeal type 1A33

Contamination resistant membrane keypad

AC-PRO-II without VDM:

Die-cast A lumin um enclosure with bright nickel finish: Nominal overall dimensions: Maximum dimensions: 3.5 x 5 x 1.52 inches

88.9 x 127 x 38.5 Millimeters

AC-PRO-II with VDM:

Die-cast Aluminum enclosure with bright nickel finish: Maximum dimensions: 3.5 x 5 x 2.28 inches

88.9 x 127 x 57.8 Millimeters

QUICK-TRIP Switch:

Die-cast Aluminum enclosure with electroless nickel finish: See Drawings below for Dimensions.

Battery:

See Section 21.0

Figure 16.1: AC-PRO-II & Quick Trip Switch Drawings and Dimensions

Page 36

AC-PRO-II® Instruction Manual www.utilityrelay.com

**** NOTE ****

times the LT Time Band Setting in seconds.

**** IN SUMMARY ****

17.0 Warranty

18.0 Time-Current Curves (TCC)

18.1 Long Time (LT) Trip Time

A conditional 2-year warranty is offered with each AC-PRO-II trip unit.

Contact Utility Relay Company for full details.

The TCCs are shown in Figures 18.1, 18.2, 18.3 and 18.4. AC-PRO-II TCCs are similar to AC-PRO TCCs, except with

improvements. The AC-PRO-II TCCs offers the following improvements

and/or updates:

- Narrower ST bands now allow coordination between the

0.2, 0.3, and 0.4 ST bands.

- Improved power-up times.

- GF I

T ON affects currents up to 0.6xCT instead of 2xCT.

The curves are shown on log-log graph with seconds in the vertical direction and current in the horizontal direction.

Overload and fault currents are shown as multiples of the LT pick-up setting. GF current is shown as a percentage of the CT rating.

Tolerances for the Pick-Up bands are ± 10% in the current direction. Tolerance for LT, ST I + 23% and -17% in the time direction. Tolerance for GF I

T and GF I2 T trip times are

trip times are +69% and -38% in the time direction. Instantaneous pick-up tolerance is ± 10% for 1A and 0.5A

CTs. Instantaneous pickup tolerance is ± 20% for 0.4A,

0.25A, and 0.2A CTs. The curves for the following time bands:

Long Time (LT)

Short Time (ST) with I²T ON Ground Fault (GF) with I²T ON Neutral Overload (NOL)

are based on the following equation: I²T = Constant Where: I is current in amps

T is time to trip in seconds (center of the band) When performing trip-timing tests using a primary injection

test set, the trip time at various test currents can be determined by calculation as explained in Sections 18.1,

18.2, 18.3 and 18.4. The TCCs are based on a total actuator operating time plus

breaker opening time in the 16ms to 33ms range.

For overload currents, the "I²T = Constant" equation can be restated as follows:

T = TBCLT

X²

Where: T = time to trip in seconds (center of the band) X = current in multiples of the LT pick-up setting TBC

= the LT Time Band Constant

= 36 X LT time band setting

The LT Time Band Constant (TBCLT) is by definition 36

EXAMPLE #1:

CT Rati n g 1600A LT pick-up 1200A LT time band 20.0S Overload Current 3600A

TBC

= 36 X LT Time Band Setting

= 36 X 20.0 = 720

and X = overload current = 3600A = 3 LT Pick-Up 1200A

therefore: trip time = T = TBCLT or 720 = 720 X² 3² 9 = 80 seconds

To calculate the LT trip time:

1) Calculate the LT Time Band Constant (TBC

)

2) Calculate "X" where X = overload current LT Pick-Up Setting

3) Solve the equation: trip tim e(sec) = TBCLT X2

Page 37

AC-PRO-II® Instruction Manual www.utilityrelay.com

**** NOTE ****

7 for the .07S Time Band

**** IN SUMMARY ****

18.2 Short Time (ST) Trip Time

With I2T off or for currents greater than 10 X LT pick-up setting, the ST trip time is a constant equal to the ST time band setting.

With I

T on and for currents less than 10 X LT pick-up setting, the ST trip time is determined by the following equation:

T = TBCST X²

Where: T = time t o trip in s econds (center of the band) X = current in multiples of the LT pick-up TBC

EXAMPLE #2:

CT Rati n g 1600A LT pick-up 1200A ST pick-up 6000A ST delay .20S I²T ON Overload Current 7200A

TBC and X = overload current = 7200A = 6

LT Pick-Up 1200A therefore:

trip time = T = TBCST or 20 = 20 X² 6² 36 = .556 seconds

= the ST Time Band Constant

The ST Time Band Constant (TBCST) = 40 f or t he .40S Time Band 30 f or t he .30S Time Band 20 f or t he .20S Time Band 15 f or t he .15S Time Band 10 f or t he .10S Time Band

= 20

To calculate the ST I2T trip time:

1) Determine the ST Time Band Constant (TBC

2) Calculate "X" where X = overload current LT Pick-Up

3) Solve the equation: trip time(sec) = TBCST

)

Page 38

AC-PRO-II® Instruction Manual www.utilityrelay.com

Long Time (LT) Pick-Up

150% ST Pick-Up

OFF & 100A steps

Short Time (ST) Pick-Up

ST I

I Pick-Up

OFF & 100A steps

Instantaneous (I) Pick-Up 150% to 1200% of LT Pick-Up

150% to 1200% of LT Pick-Up

20% to 100% of CT Rating

5A steps

AC-PRO-II O.L. Rev 1.01 01/15/2015

(0.5A steps for CTs < 225A)

(10A steps for CTs < 225A)

Current in Multiples of Long Time Pick-Up

20X

.01

150%

I Pick-Up

1200%

10X

2.0s

SECONDS

.40s I

.20s I

T ON

.15s I

T ON

.30s I

T ON

SECONDS

& without I

ST Delay with

1200% ST Pick-Up

600% LT Pick-Up

@ 600% LT Pick-Up

20X

LT Delay

100

2.0 to 30.0 sec.

0.5 sec. steps

30s

1000

10X

100

1000

@ 1200% of

(I-OVRD) CT Rating

(if applicable)

Instantaneous Override

.01

.40sec

.15sec

.20sec

.30sec

.10s I

ST I

T OFF

.07sec

T ON

.07s I

T ON

.10sec

CT Secondary Rating 0.5A and above

50% to 100% of CT Rating

CT Secondary Rating below 0.5A

Figure 18.1: Overload TCC

Page 39

AC-PRO-II® Instruction Manual www.utilityrelay.com

**** NOTE ****

0.036 for the .10S Time Band

**** NOTE ****

102.4 for the .10S Time Band

**** IN SUMMARY ****

**** NOTE ****

times the NOL Time Band Setting in seconds.

**** IN SUMMARY ****

18.3 Ground Fault (GF) Trip Tim e

T = TB2CGF

T = TB5CGF

With the GF slope set to OFF, the GF trip time is a constant equal to the GF Time Band setting.

With the GF slope set to I2T:

For GF currents greater than 0.6 times the CT rating, the GF trip time is a constant equal to the GF Time Band setting.

For GF currents less than 0.6 times the CT rating, the GF

trip time is determined by the equations below.

With the GF slope set to I5T:

For GF currents greater than 4.0 times the GF Pickup, the GF trip time is a constant equal to the GF Time Band setting.

For GF currents less than 4.0 times the G F Pickup, the GF trip time is determ i ned by the equations below:

for I

XGF²

T OR for I5T

Where: T = time to trip in seconds (center of the band) XGF = ground fault current

CT rating

X5GF = ground fault current

GF Pickup TB2C

TB5C

= the GF I2T Time Band Constant

= the GF I5T Time Band Constant

The GF I2T Time Band Constant (TB2CGF) =

0.18 for the .50S Time Band

0.144 for the .40S Time Band

0.108 for the .30S Time Band

0.072 for the .20S Time Band

The GF I5T Time Band Constant (TB5CGF) = 512 for the .50S Time Band

409.6 for the .40S Time Band

307.2 for the .30S Time Band

204.8 for the .20S Time Band

EXAMPLE #3 (I

T Slope):

CT Rati n g 1600A LT pick-up 1200A GF p ick-up 640A GF time band .20S I²T Slope Ground Fault Current 800A

TB2CGF = 0.072 and XGF = ground fault current = 800A

CT Rating 1600A = 0.5

therefore: trip time = T = TB2CGF or 0.072 = 0.072 XGF² (0.5)² 0.25 = 0.288 sec

To calculate the GF I2T trip time:

1) Determine the GF Time Band Constant (TB2C

2) Calculate "X XGF = ground fault current CT Rating

3) Solve the equation: trip time(sec) = TB2CGF

" where

EXAMPLE #4 (I

T Slope):

CT Rati n g 2000A LT pick-up 2000A GF p ick-up 800A GF time band .30S I

T Slope

Ground Fault Current 2400A TB5C

= 307.2

and X5GF = ground fault current = 2400A GF Pickup 800A = 3.0

therefore: trip time = T = TB5CGF or 307.2 = 307.2 X5GF² (3.0)5 243

= 1.264 sec

18.4 Neutral Overload (NOL) Trip Time

The NOL trip time is calculated in the same manner as the LT trip time.

For NOL currents, the "I²T = Constant" equation can be restated as follows:

T = TBC

X²

Where: T = time to trip in seconds (center of the band) X = current in multiples of the NOL pick-up setting TBC = 36 X NOL time band setting

The NOL Time Band Constant (TBC

EXAMPLE #5:

CT Rati n g 1600A NOL pick-up 800A NOL time band 15.0S NOL Current 2400A

TBC = 36 X 15.0 = 540

and X = overload current = 2400A = 3 NOL pick-up 800A

therefore: trip time = T = TBC X² 3² 9 = 60 seconds

To calculate the NOL trip time:

1) Calculate the NOL Time Band Constant (TBC

2) Calculate "X" where X = overload current NOL pick-up Setting

3) Solve the equation: trip tim e(sec) = TBC X2

)

NOL

= the NOL Time Band Constant

NOL

= 36 X NOL Time Band Setting

NOL

or 540 = 540

NOL

) is by definition 36

NOL

)

Page 40

AC-PRO-II® Instruction Manual www.utilityrelay.com

Current in Percent of CT Rating

100%

20%

.01

40%

60%

GF I

T OFF 0.10 sec

GF I

T ON

T Slope

.10s I

.10sec

200%

Ground Fault (GF) Pick-Up

20% GF

OFF & 10A steps

20% to 200% of CT Rating

100%

20%

40%

Pick-Up

200%

1000

(1A steps for CTs < 225A)

60%

SECONDS

.20sec

.30sec

with or

GF Delay

.40s

.20s

100

.30s

.50s

.40sec

.50sec

Pick-Up

200% GF

.50sec

GF ends

CT Secondary Rating 0.5A and above

1200A Max

50% to 200% of CT Rating

CT Secondary Rating below 0.5A

1200A only

CT ratios over 24000

(requires VDM or 24VDC)

at 12xCT

does not comply with

0.5 sec GF delay setting IEEE C37.17.

Note:

.10sec

.20sec

.30sec

.40sec

.50sec

AC-PRO-II G.F. Rev 2.0 12/21/2016

Current in Multiples of Ground Fa ult Pick-Up

.01

4X 10X

SECONDS

100

1000

10X

AND

I T Ground Fault Slope

Ground Fault Slope OFF

I T Ground Fault Slope

at 12xCT

GF ends

T Slope

GF I

slope OFF

does not comply with

0.5 sec GF delay setting IEEE C37.17.

Note:

(available for breakers with 1-Amp CTs).

Figure 18.2: Ground Fault (GF) TCC

Page 41

AC-PRO-II® Instruction Manual www.utilityrelay.com

200%

100%

500%

1000%

2.0s

SECONDS

600% NOL

@ 600% NOL Pick-Up

NOL Delay

100

2.0 to 30.0 sec.

0.5 sec. steps

30s

1000

Current in Percent of NOL Pick-Up

100%

200%

500%

1000%

Pick-Up

Neutral Overload (NOL) Pick-up

5A steps for CTs > 225A

0.5A steps for CTs < 225A Neutral CT Secondary Rating 0.5A and above 20% to 200% of CT Rating Neutral CTs Secondary Rating below 0.5A 50% to 200% of CT Rating

AC-PRO-II NOL Rev 1.2 07/14/2015

NOL ends at 1200% of CT Rating.

Figure 18.3: Neutral Overload (NOL) TCC

Page 42

AC-PRO-II® Instruction Manual www.utilityrelay.com

Pick-Up

20%

40%

60%

100%

200%

20%

40%

60%

100%

200%

OFF & 10A steps

20% to 200% of CT Rating

200% QT GF

SECONDS

.01

100

1000

Quick-Trip Ground Fault Time Current Curve

(QT GF Pick-Up)

Current in Percent of CT Rating

20% QT GF

Pick-Up

Quick-Trip Ground Fault Pick-Up

QT I Pick-Up

(QT I) Pick-Up

LT Pick-Up

100A steps

Current in Multiples of Long Time Pick-Up

20X

.01

150%

QT I Pick-Up

1200%

10X

Quick-Trip Instantaneous Time Current Curve

Quick-Trip Instantaneous

150% to 1200% of

SECONDS

(1A steps for CTs < 225A)

(10A steps for CTs < 225A)

4X1X

10X

6X 20X

AC-PRO-II Q.T. Rev 1.02 01/15/2015

CT Secondary Rating 0.5A and above

1200A max

50% to 200% of CT Rating

CT Secondary Rating below 0.5A

CT ratios above 24000 1200A only

(requires VDM or 24VDC)

QT-GF ends at 12 x CT Rating

Figure 18.4: QUICK-TRIP Ground Fault and QUICK-TRIP Instantaneou s TCCs

Page 43

AC-PRO-II® Instruction Manual www.utilityrelay.com

18.5 Current Metering Accuracy

19.0 Voltage & Power Calculations

20.0 Error an d Alarms

20.1 Internal Error

20.2 Actuator Open Circuit

For 1-Amp and 0.5-Amp secondary CTs: + /- 2% for currents between 20% and 150% of CT Rating

For CTs with secondary below 0.5A: + /- 2% for currents between 50% and 150% of CT Rating

Voltage accuracy: +/- 1.5% for 80V and greater, +/ - 1.2V for 0 – 80V.

Power accuracy (Instantaneous values) +/- 5% for currents between 10% and 150% of CT rating

Energy calculations: Refer to Section 13.0.

If an internal error occurs in the AC-PRO-II, the OK LED will not be lit and the screen below will appear.

20.3 Alarm Sc reens

If configured in user settings, the alarm relay will operate when a trip, OV, or UV alarm occurs and the following screen(s) will appear.

Figure 20.3: Trip Alarm Screen

Figure 20.4: OverVoltage Alarm Screen

Figure 20.1: Internal Error Screen

If this screen appears and persists, please contact Utility Relay Company.

If configured in user settings, the alarm relay will operate for this condition. The “Exit” button is available and allows bypassing this screen for temporary menu navigation. If the condition is still present, this screen will re-appear the next time the display is turned on.

If the AC-PRO-II detects an open circuit at the actuator terminals, the OK led will not be ON and and the following screen will appear, indicating an actuator open circuit condition, in which case the trip unit will not trip the breaker. repair the actuator connection.

Figure 20.2: Actuator Open screen

If configured in user settings, the alarm relay will operate for this condition.

The “Exit” button is available and allows bypassing this screen for temporary menu navigation. If the condition is still present, this screen will appear the next time the display is turned on.

Figure 20.5: UnderVoltage Alarm Screen

Figure 20.6: Clear Alarms Screen

Pressing the “View” button will show the trip history information. Pressing the “Clear” button will show the clear alarm screen. Pressing “Exit” will temporarily bypass this screen for temporary menu navigation. If the condition is still present, this screen will appear the next time the display is turned on.

20.4 Un-Calibrated

If the following screen appears, do not place the trip unit in service. Please contact URC.

Figure 20.7: Un-Calibrated Screen

Page 44

AC-PRO-II® Instruction Manual www.utilityrelay.com

21.0 Battery

22.0 Rotating the Display

Display Screws

Battery

Door

21.1 Checking the Battery Voltage

See Section 6.4.2.

21.2 Batter y Repla cement

For best performance, replace the battery with the following 3-volt lithium battery:

Panasonic CR2 Indust ri al Lithi um battery 3V #CR15H270

A replacement battery can be purchased from:

• Utility Relay Co. P art # T-125

• Digi-Key Part # P157-ND

www.digikey.com

• Newark Part #15R3550 www.newark.com

Lithium battery ratings:

• 850 mAh Capacity

Figure 21.1: Battery Door

To replace the battery:

• The breaker must be out of service and de-energized for safety.

• Remove the black wiring cover by pulling the wiring cover off the three (3) standoff posts.

• Loosen the single #2-56 x 1/4 screw with a screwdriver.

• Remove the screw and associated locking washer.

• Before sliding the battery door forward, place hand

below the battery door, as the battery contact spring will push the battery out.

• Slide the battery door forward.

• Remove the old battery.

• Check battery markings and insert positive (+) nub end

of the battery into the trip unit first (the positive (+) nub should be up when trip unit is upright, flat (-) end should be down).

• Replace Battery door, washer and screw.

• If applicable, to reset low battery state, perform manual

battery test using the MORE Menu. See Figure 6.5 for MORE Menu.

**** IMPORTANT ****

For best performance, replace the battery with the recommended Panasonic CR2 3-volt lithium battery.

The breaker must be removed from service before replacing the battery.

The replacement battery must be inserted with the proper polarity.

For proper contact, the battery door screw must be in place and hand-tightened.

After replacing battery, Time and Date must be set. See Section 11.25.

The AC-PRO-II trip unit consists of a main case and a display case. Refer to Figure 4.3. The trip unit orientation can be modified by rotating the display case. Refer to the AC-PRO-II retrofit kit installation manuals for breakerspecific trip unit orientation options. The AC-PRO-II can be configured in the three (3) normal orientations listed below.

1. Horizontal (breaker harnes s c onnect i on at right). All units are shipped in this orientation.

2. Vertical bottom (breaker harness connection at bottom).

3. Vertical top (breaker harness connection at top).

To rotate the Display Case:

• The breaker must be out of service and de-energized for safety.

• Ensure the person rotating the display is properly grounded and takes special care to avoid static discharge onto trip unit and display internal components.

• Remove the black wiring cover by pulling the wiring cover off the three (3) standoff posts.

• NOTE: the display case is connected to the main case via the following

o One (1) Ribbon cable. See Figure 22.2. o Four (4) captive screws. See Figure 22.1

• Loosen the four (4) captive screws with a screwdriver.

• Leave the ribbon cable connected. Do not disconnect

the ribbon cable.

• Rotate the display to one of the three options listed at the beginning of this section. Be careful not to damage, pinch, or disconnect the ribbon cable.

• Tighten the four (4) captive screws.

• Press the “DISPLAY” button and smart buttons to

confirm operation.

• Refer back to the AC-PRO-II retrofit kit Instructions for additional breaker specific steps.

Case

Figure 22.1: Display Case Screw locations

Page 45

AC-PRO-II® Instruction Manual www.utilityrelay.com

23.0 InfoPro-ACTM Software Application

Display

Main Case

Ribbon Cable

Figure 22.2: Trip Unit and Display (separated)

InfoPro-AC is a software application that can be used with AC-PRO-II for the following:

• Settings – upload, download, view, save, and print.

• Trip history including waveforms – view, save, and

print.

• Waveforms (on-demand) – view, save, and print.

• Current, voltage, & power readings – view.

• Alarms and trip unit status Information

• Trip unit info: serial number, firmware versions, breaker

name.

• Firmware updates

Operating System: Microsoft Windows, ideally Windows 7, Wi ndows 8 or Windows Vista.

Connection: mini-USB (cable not included) NOTE: if AC-PRO-II is located behind a cubicle door,

a USB panel mount extension was provided with the retrofit kit. (See Section 5.6.1).

The InfoPro-AC™ software application is available for download at:

http://www.utilityrelay.com/Side_Bar/Downloads.html

**** IMPORTANT ****

InfoPro-AC needs the correct USB device driver to comm unicate with A C-PRO-II. Microsoft Windows often already includes these drivers. However, if this driver is not already installed:

1) Ensure your PC is connected to the Internet.

2) Connect AC-PRO-II to your PC with the USB cable.

3) Automatic driver update process: a) After you connect the AC-PRO-II, if you

have an internet connection and administrative rights on your PC, Microsoft Windows should install the driver automatically after a few minutes.

4) Manual dri ver updat e proc ess: a) O pen Windows Device Manager b) Ri ght click on the AC-PRO-II device. It will

be located under Ports or under Other Devices.

c) Choose the “Update Driver Software”

option. d) Choose the “Search automatically” option. e) After the driver is installed, close and then

reopen the InfoPro-AC Application.

NOTE: Any pending Microsoft Windows updates can interfere with the driver installation process.

For more detailed instructions with screenshots, contact URC.

Refer to the InfoPro-AC™ Help Guide within the InfoPro—AC application for specific information and instructions.

23.1 Firmware Versions and Updates

To determine which firmware version is currently installed on your AC-PRO-II, use the MORE menu. See Figure 6.5.

The InfoPro-AC application can be used to update AC-PRO-II firmware in the field using the USB port. AC-PRO-II Firmware update instructions can be found in the InfoPro-AC Help Menu. For firmware version information see the following link:

http://www.utilityrelay.com/Side_Bar/Firmware_versions.html

Open the downloaded file and follow the instructions to install the application.

Page 46

AC-PRO-II® Instruction Manual www.utilityrelay.com

Figure 23.1: InfoPro-AC Readings Tab Screenshot

Figure 23.2: InfoPro-AC Waveform Tab Screenshot

Page 47

AC-PRO-II® Instruction Manual www.utilityrelay.com

Figure 23.3: InfoPro-AC Trip History Tab Screenshot

Figure 23.4: InfoPro-AC Settings Tab Screenshot

Page 48

AC-PRO-II® Instruction Manual www.utilityrelay.com

24.0 Communications

24.1 Communications Introduction

24.2 Communications Components

24.3 Communications Wiring

24.4.1 Ethernet

24.4.2 LCI Ethernet

Creating a complete power monitoring and communications system for a low voltage power distribution system is easy with Utility Relay Company’s AC-PRO-II. The standard AC-PRO-II trip unit communicates using industry standard Modbus RTU protocol through a single shielded twisted pair wire connected to the RS485 port. A number of trip units can be daisy-chained together to simplify installation.

AC-PRO-II communications features and i nformation:

• Currents, 3-phase (±2% acc uracy for currents between 20% and 150% of the CT rating)

• Review and change all settings (“Changing settings over Comm” user setting must be enabled at trip unit).

• Voltages, 3-phase

• KW, 3-phase & total (±5% accuracy for currents between 10% and 150% of the CT rating)

• KWHr, total

• KVA, 3-phase & total

• KVAHr, total

• Power Factor data

• Breaker position status (open or closed)

• Trip unit alarms and status information

• Sluggish-Breaker indication

• QUICK-TRIP ON /OFF statu s

• Trip history data for the last 8 trips

o Trip counts o Trip type (reason for trip) o Trip dates & timestamps o Trip currents & voltages o Breaker clearing times

• Trip unit t ime and date

• Trip unit Information: serial number, firmware revision.

• Forced trip (“Forced trip over Comm” user setting must be enabled at trip unit).

NOTE: Voltage Divider Module (VDM) is required for

A host PC running HMI software with Modbus device drivers collects information from the trip units. The driver interrogates each trip unit individually and reports that information back to the host PC applications on a continual basis. Additional trip units can be added to the system by simply providing the new trip unit’s ADDRESS to the HMI software.

AC-PRO-II trip units are compatible with the Modbus RTU communication protocol supplied with most HMI systems such as Inductive Automation’s Ignition, Wonderware’ s

InTouch

PEGASYS

An AC-PRO-II Modbus Communications system consists of the following hardware components:

Additional components to consider include:

voltage and power information.

and ION Enterprise

, Intellution

1. AC-PRO-II trip unit and breaker retrofit components.

2. Host PC (supplied by others).

3. Cabling topology (supplied by others).

1. OPC software with Modbus device drivers (supplied by others).

2. Modbus RTU/Ethernet converter (supplied by others).

3. Human-Machine Interface (HMI) System (supplied by others). These systems are used to view trip unit information graphically and often contain their own compatible Modbus Driver.

, Square D’s PowerLogic SMS-3000

, and Power Measurements

Although all AC-PRO-II trip units are capable of communications, units that are specifically ordered for communications are furnished with quick-disconnect communications cable assemblies. The cable assembly features a heavy-duty twist-lock connector and a terminal block, which mounts inside the switchgear.

The purpose of the terminal block is to provide a connection location for the twisted pair wire as it is daisy-chained from cell to cell in a switchgear lineup. This enables any individual communicating AC-PRO-II (mounted on a circuit breaker) to be removed without disrupting communications between the other communicating AC-PRO-II trip units.

See Figure 5.3 for wiring diagram. If replacing an existing AC-PRO with AC-PRO-II, remove the existi ng 2-piece AC-PRO communications cable from the cubicle, and use the new 2-piece cable shipped with the AC-PRO-II.

NOTE: The RS485 End of Line Termination switch should be in the on position on the AC-PRO-II that is the last device in the RS-485 loop. See Figure 4.1.

24.4 System Components & Computer Hardware

URC trip units communicate over the RS485 interface at 9600 or 19200 Baud, with 8 data bits, 1 stop bit and no parity using the Modbus RTU communications protocol.

With the addition of an RS485 to Ethernet Converter an existing Local Area Network (LAN) can be used to carry data between trip units and the PC. Converters are widely available from a variety of industrial computer manufacturers.

RS485 to Ethernet Converters are designed to be compatible with a TCP/IP network environment and typically connect to a LAN using standard 10Base-T modular CAT-5 cabling. These converters offer a relatively inexpensive means of connecting to a LAN.

The LCI (Local Communications Interface), manufactured by Utility Relay Company, is a substation monitor that continuously monitors up to 32 AC-PRO-II trip units that are connected to the LCI’s RS485 port. The LCI offers three key benefits:

1. The 4-line X 20-character display provides easy monitoring of a critical power and trip data from any trip unit connected to the RS485 port.

2. The built-in Ethernet port acts as a Modbus RTU to Modbus Ethernet converter and easily connects to a LAN with a simple CAT-5 cable. A unique IP address for the LCI is user-programmable from the LCI’s front panel.

3. Embedded Web Pages in the LCI provide critical information across the LAN with no additional software to install or setup. Information can be accessed by typing the LCI’s IP address in the command line of any standard web browser on the LAN.

NOTE: To ensure proper communication with AC-PRO-II, jumper connector J6 must be removed from the LCI circuit board. This jumper was removed at the factory for units that shipped after March 2015. Contact URC for additional details.

Page 49

AC-PRO-II® Instruction Manual www.utilityrelay.com

Ethernet

Workstation Workstation

SUBSTATION #3

SUBSTATION #2

SUBSTATION #1

RS-485

Converter

RS-485

Converter

RS-485

Converter

Up to 32 trip units

can be daisychained

together.

Ethernet

Workstation Workstation

LCI LCI LCI

SUBSTATION #3

SUBSTATION #2

SUBSTATION #1

Up to 32 trip units

can be daisychained

together.

Figure 24.1: Ethernet configuration

24.5 Trip Unit Programming

AC-PRO-II trip unit has several programmable settings related to communications. See Section 11.26 for communications settings.

REPLY DELAY

The REPLY DELAY set point is the minimum delay between

the trip unit’s receipt of a MODBUS packet and its reply.

Adjusting it enables the trip unit to operate properly with other manufacturers’ MODBUS RS-485 connections.

Figure 24.2: LCI Ethernet Configuration

The factory default of this set point is 5 milliseconds. The reply delay can be changed using the InfoPro-AC

software application.

24.6 Modbus Registers

The AC-PRO-II Modbus Register Map is available for download at the following location:

http://www.utilityrelay.com/PDFs/Product_Manuals/I-AC2COMM.pdf

Page 50

This Page Intentionally Left Blank

*I-AC-PRO-II*

I-AC-PRO-II

Chagrin Falls, OH 44023 Phone: 888.289.2864 www.utilityrelay.com

Utility Relay Company AC-PRO-II Instruction Manual

Specifications and Main Features

Frequently Asked Questions

User Manual