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ac-pro
ac trip unit
micro-controller based
instruction manual
State of the art technology for low
voltage circuit breaker retrofitting
U R C
Utility Relay Company
C h a g r i n F a l l s , O H 4 4 0 2 3
P h o n e : 8 8 8 . 2 8 9 . 2 8 6 4
w w w . u t i l i t y r e l a y . c o m
Courtesy of NationalSwitchgear.com
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Summary of Contents for URC URC
- Page 1 ac-pro ac trip unit micro-controller based instruction manual State of the art technology for low voltage circuit breaker retrofitting U R C Utility Relay Company C h a g r i n F a l l s , O H 4 4 0 2 3 P h o n e : 8 8 8 .
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Page 2: Table Of Contents
AC-PRO , AC Trip Unit - Instruction Manual www.utilityrelay.com Manual Rev 1.1 10.6 U/B T ..........17 INTRODUCTION..........2 10.7 ........17 RASE UL/ULC CLASSIFICATION....... 2 RATINGS ............18 TRIP UNIT POWER ..........3 WARRANTY..........18 (CT) P ..3 URRENT RANSFORMER OWER TIME-CURRENT CURVES ......19 ..........3 ATTERY OWER... -
Page 3: Introduction
Utility Relay Company Introduction UL/ULC Classification The AC-PRO is a state of the art, micro-controller AC-PRO is UL and ULC classified for use on the based trip unit for use on three phase, 600 Volt following low voltage AC power circuit breakers: class, AC circuit breakers. -
Page 4: Trip Unit Power
AC-PRO , AC Trip Unit - Instruction Manual www.utilityrelay.com 3. Trip Unit Power The AC-PRO can be powered in 3 different ways: When on battery power, the trip unit will CTs, battery, or auxiliary power pack. automatically turn off after 30 seconds to conserve battery energy. -
Page 5: Auxiliary Power
Utility Relay Company 3.3 Auxiliary Power Auxiliary power is optional. It can be used to change or review the trip unit settings without using the internal battery. A neutral CT wiring harness is provided as part of the neutral CT installation kit and is only required Plug the 24-VAC auxiliary power pack into the with ground fault on a 4-wire system. - Page 6 AC-PRO , AC Trip Unit - Instruction Manual www.utilityrelay.com 4.3 Remote Display Figure 4.2 PRO-DISPLAY Front View Figure 4.3 PRO-DISPLAY Connection A panel mount remote display is available as an option for the AC-PRO. It is mounted on the front For security reasons, it is not possible to of the cubicle door.
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Page 7: Front View
Utility Relay Company 5. Front View The front view of the horizontal version of the AC- PRO trip unit is shown in Figure 5.1. The front view of the vertical version of the AC-PRO is shown in Figure 5.2. Figure 5.1 AC-PRO Horizontal Front View Figure 5.2 AC-PRO Vertical Front View Page 6 Courtesy of NationalSwitchgear.com... -
Page 8: Character Display Pick -Upled
AC-PRO , AC Trip Unit - Instruction Manual www.utilityrelay.com 16 Character Display 5.5 Up A 16-character dot matrix liquid crystal display Use this push button to increase the setting (LCD) provides information to the user. values during commissioning. When the push button is held longer than 1 second, the settings The LCD is used for the following purposes: are increased in fast mode. -
Page 9: Commissioning
Utility Relay Company 6.1 Powering-Up The Trip Unit Commissioning In normal service, the AC-PRO trip unit is Before the AC-PRO trip unit is put into service, it powered directly from the breaker mounted CTs. must first be commissioned so it will function. This requires the user to enter all of the pick-up For commissioning, the AC-PRO trip unit can be and delay settings into the unit. -
Page 10: Ct Rating
AC-PRO , AC Trip Unit - Instruction Manual www.utilityrelay.com 6.3 CT Rating Long Time (LT) Pick-Up Setting After the security key is connected, the following The following will be displayed: will be displayed: LT PICK-UP XXXXA CT RATING XXXXA Where "XXXX" represents the LT Pick-Up setting Where "XXXX"... -
Page 11: Short Time (St) Pick-Up Setting
Utility Relay Company Short Time (ST) Pick-Up Setting Short Time (ST) I²T The following will be displayed: The I²T function adds a ramp to the ST delay if required for coordination purposes as shown in the Overload TCC in Figure 15.2. ST PICK-UP If the ST function is not off, then the following will If the ST function is not desired, press the... -
Page 12: Ground Fault (Gf) Pick-Up Setting
AC-PRO , AC Trip Unit - Instruction Manual www.utilityrelay.com Ground Fault (GF) Pick-Up Setting round Fault (GF) I²T 6.10 6.12 G If the GF function is not desired, then press the The I²T function adds a ramp to the GF delay if "DOWN"... -
Page 13: Phase Unbalance (U/B) Pick-Up
Utility Relay Company Phase Unbalance (U/B) Pick-Up Exit Procedure 6.13 6.15 The following will be displayed: The following will be displayed: U/B PICK-UP SAVE IF DONE If the U/B function is not desired, then press the REVIEW TO REVIEW "SAVE” push button and go to Step 6.15. If it is desired to review the setting, push the If the U/B function is desired, press the "UP"... -
Page 14: Changing Settings
AC-PRO , AC Trip Unit - Instruction Manual www.utilityrelay.com 7. Changing Settings If it is desired to review the setting, push the **** IMPORTANT **** "REVIEW" push button. Make any changes While it is possible to make changes to the necessary using the "UP"... - Page 15 Utility Relay Company If there was a last trip, the following c) If the “REVIEW” key is pushed again and messages will alternately display showing the held down for longer than 2 seconds, each cause of the trip and the currents at the time type of trip is displayed along with the of trip.
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Page 16: Normal Operation
AC-PRO , AC Trip Unit - Instruction Manual www.utilityrelay.com Normal Operation Breaker Current Less than about 8% of CT Breaker Current Greater than the LT pick-up: Rating: When the trip unit detects a phase overload With all phase currents less than about 8%, the situation, the “PICK-UP”... -
Page 17: Testing
Utility Relay Company Testing 10.3 ST Trip Test A "primary injection" test is recommended as the Make sure GF is temporarily set to “OFF”. The final test of the AC-PRO retrofit. U/B function can be left “ON”. It is not necessary to turn off the Unbalance (U/B) To test the ST Pick-Up, temporarily set ST I T to function when doing a single-phase primary... -
Page 18: Ata
AC-PRO , AC Trip Unit - Instruction Manual www.utilityrelay.com 10.6 U/B Trip Test 10.7 Erase Last Trip Data After completing the primary injection test, it is The U/B trip function is not easy to test with a important to erase the last trip data from the single phase, high current test set. -
Page 19: Ratings
Utility Relay Company Ratings Ambient Temperature: Method 2: Trip Unit: 1) The trip unit should not be powered-up -4°F (-20°C) to 150°F (65°C) (i.e. the display should be OFF). LCD Display: Standard Temp, Super Twist 2) Connect the security key. See section 4.2. 32°F (0°C) to 122°F (50°C) 3) Press and hold in both the "UP"... -
Page 20: Time-Current Curves
AC-PRO , AC Trip Unit - Instruction Manual www.utilityrelay.com Time-Current Curves LT Trip Time 13.1 The Time-Current curves are shown in For overload currents, the "I²T = Constant" Section 15. equation can be restated as follows: For all the functions except U/B, the curves are T = TBC shown on log-log graph with seconds in the X²... - Page 21 Utility Relay Company 13.2 ST Trip Time EXAMPLE #2: With I T OFF or for currents greater than 10 X LT CT Rating 1600A Pick-Up Setting, the ST trip time is a constant LT pick-up 1200A equal to the ST Time Band setting. ST pick-up 6000A ST time band...
- Page 22 AC-PRO , AC Trip Unit - Instruction Manual www.utilityrelay.com GF Trip Time 13.3 With I T OFF or for ground fault currents greater **** IN SUMMARY **** than 2 times the CT rating, the GF trip time is a constant equal to the GF Time Band setting. To calculate the GF I T trip time: 1) Determine the GF Time Band Constant...
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Page 23: Key Error Message Summary
Utility Relay Company 14. Error Message Summary The following is a summary of the possible error messages and what action is necessary to correct the problem. 14.1 Actuator Not Connected When the actuator is not connected or is open circuited, the following message will be displayed: NO ACTUATOR All push buttons are disabled. - Page 24 AC-PRO , AC Trip Unit - Instruction Manual www.utilityrelay.com Figure 15.1, Wiring Diagram Page 23 Courtesy of NationalSwitchgear.com...
- Page 25 Utility Relay Company INTENTIONALLY LEFT BLANK Page 24 Courtesy of NationalSwitchgear.com...
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Page 26: Display Contrast Wiring Diagram U P Overload Tcc
AC-PRO , AC Trip Unit - Instruction Manual www.utilityrelay.com Figure 15.2 Overload TCC Page 25 Courtesy of NationalSwitchgear.com... - Page 27 Utility Relay Company INTENTIONALLY LEFT BLANK Page 26 Courtesy of NationalSwitchgear.com...
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Page 28: Down U/B & Gf Tcc
AC-PRO , AC Trip Unit - Instruction Manual www.utilityrelay.com Figure 15.3, U/B & GF TCC Page 27 Courtesy of NationalSwitchgear.com...
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