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AC-PRO trip unit Instruction Manual URC
Utility Relay Company
ac-pro
®
i-ac-pro-QT
ac trip unit AC-PRO
TM
With QUICK-TRIP
TM
Instruction Manual
www.utilityrelay.com



Page 1

Manual Rev 1.1


Section: Page
1.0 Introduction.......................................................... 2
2.0 UL/ULC Classification.......................................... 2
3.0 Trip Unit Power.................................................... 2

3.1 Current Transformer (CT) Power ................. 2

3.2 Battery Power .............................................. 2

3.3 PT Module Power ........................................ 3

3.4 Auxiliary Power ............................................ 3
4.0 External Connections........................................... 3

4.1 Breaker Wiring Harness............................... 3

4.2 Security Key ................................................ 3
5.0 AC-PRO
TM
Front View ......................................... 4

5.1 16 Character Display ................................... 5

5.2 Pick-Up LED................................................ 5

5.3 Self Test LED .............................................. 5

5.4 Display Contrast .......................................... 5

5.5 UP Push Button ........................................... 5

5.6 DOWN Push Button..................................... 5

5.7 SAVE Push Button ...................................... 5

5.8 REVIEW Push Button.................................. 5
6.0 QUICK-TRIP
TM
System ....................................... 6

6.1 QUICK-TRIP
TM
Basics................................. 6

6.2 QUICK-TRIP
TM
Installation .......................... 7

6.3 QUICK-TRIP
TM
& Pro-Display Operation ..... 7
7.0 Commissioning the AC-PRO
TM
............................ 8

7.1 Powering-Up the Trip Unit............................ 8

7.2 Security Key ................................................ 8

7.3 CT Rating .................................................... 9

7.4 Long Time (LT) Pick-Up Setting................... 9

7.5 Long Time (LT) Delay Setting ...................... 9

7.6 Short Time (ST) Pick-Up Setting.................. 9

7.7 Short-Time (ST) Delay Setting..................... 9

7.8 Short Time (ST) I
2
T ..................................... 9

7.9 Instantaneous (I) Pick-Up Setting ................ 10

7.10 Ground Fault (GF) Pick-Up Setting .............. 10

7.11 Ground Fault (GF) Delay Setting ................. 10

7.12 Ground Fault (GF) I
2
T.................................. 10

7.13 Phase Unbalance (U/B) Pick-Up.................. 10

7.14 Phase Unbalance (U/B) Delay ..................... 10

7.15 Address ....................................................... 11

7.16 Reply Delay ................................................. 11

7.17 QUICK-TRIP
TM
Ground Fault (QT GF)......... 11

7.18 QUICK-TRIP
TM
Instantaneous (QT I) ........... 11

7.19 Thermal Memory.......................................... 12

7.20 Exit Procedure ............................................. 12
8.0 Changing Settings ............................................... 13
9.0 Last Trip Data Recall ........................................... 14
10.0 Normal Operation ................................................ 15
11.0 Testing ................................................................ 15

11.1 Commission the Trip Unit ............................ 15

11.2 LT Trip Test ................................................. 15

11.3 ST Trip Test................................................. 16

11.4 I Trip Test .................................................... 16

11.5 GF Trip Test ................................................ 16

11.6 QT GF Trip Test .......................................... 16

11.7 QT I Trip Test .............................................. 16

11.8 U/B Trip Test ............................................... 16

11.9 Erase Last Trip Data.................................... 17
12.0 Secondary Injection Testing................................. 17

12.1 AC-PRO
TM
Secondary Injection Test Set..... 17

12.2 Standard Relay Test Set.............................. 17

12.3 LT Delay Testing Chart ................................ 18
13.0 Ratings ................................................................ 19
14.0 Warranty.............................................................. 19
15.0 Time-Current Curves ........................................... 19

15.1 LT Trip Time ................................................ 20

15.2 ST Trip Time................................................ 20

15.3 GF Trip Time ............................................... 21

15.4 U/B Trip Time .............................................. 21
16.0 Error Message Summary..................................... 21

16.1 Actuator Not Connected............................... 21

16.2 Memory Error............................................... 21


Figure: Page
4.1 AC-PRO
TM
Top View............................................3
5.2 AC-PRO
TM
Horizontal Front View.........................4
5.3 AC-PRO
TM
Vertical Front View.............................4
6.1 QUICK-TRIP
TM
Connections ................................6
6.2 QUICK-TRIP
TM
Drilling Plan.................................7
11.1 U/B Test...............................................................16
12.1 AC-PRO
TM
Secondary Injection Test Set .............17
17.1 Typical Wiring Diagram ........................................23
17.2 Overload TCC ......................................................25
17.3 U/B & GF TCC .....................................................27
17.4 QUICK-TRIP
TM
GF & I TCC .................................29

Firmware Revision: 5.01 Utility Relay Company


Page 2




The AC-PRO is a state of the art, micro-controller based trip
unit for use on three phase, 600 Volt class, AC circuit
breakers. Models are available for use on 60 Hz, 50 Hz, 40
Hz, and 25 Hz systems.

The AC-PRO is a digital trip unit that uses a micro-controller
and a 16-character liquid crystal display (LCD).

The trip unit provides over-current, as well as short time and
instantaneous fault protection. All of the phase protection
functions use the true RMS currents including
instantaneous trip.

The AC-PRO measures the true RMS current through each
of the breakers three poles. For ground fault current, the
trip unit also does a vector sum of the three phase currents
(and neutral current if applicable) and determines the
fundamental frequency component.

The trip unit also offers ground fault and phase unbalance
(U/B) tripping functions as user selectable options. The
fundamental value of the ground fault current is used for
the ground fault trip function to eliminate nuisance
ground fault trips due to multiples of 3
rd
harmonic.

The AC-PRO also has two additional QUICK-TRIP protective
settings that are intended to minimize Arc Flash Hazard. The
QUICK-TRIP ground fault and instantaneous trip functions are
turned ON or OFF using the QUICK-TRIP Pro-Display. See
Section 6.0 for complete details.

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

The trip unit does not require external power to operate. Power
is derived from the current transformers (CTs). An internal
battery provides power to review and change protection
settings when CT power is unavailable.


All settings are made directly in amps or in seconds. A
security system reduces the risk of unauthorized tampering
with the trip unit settings.




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

Westinghouse DB-50
General Electric AK-50
General Electric AK-75

UL and ULC classification is in accordance with UL1066,
CSA C22.2, IEEE C37.59-1991 as well as appropriate
sections of ANSI C37.17-1979 and C37.50-1989.

AC-PRO was tested by an independent laboratory and found
in compliance with the following tests:

RF Susceptibility
Surge Withstand
15KV Electro-Static Discharge
Accuracy @ -20°C & +65°C







The AC-PRO can be powered in 4 different ways: CTs,
internal battery, PT module, or auxiliary power pack.




The AC-PRO derives both signal and power from the
breaker phase CTs. The trip unit will power-up with less
than 10% of the rated CT tap current through a single CT
(20% for the 1/2 Amp version). This current is below the
lowest pick-up setting.



A 9-volt, 1200