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Utility Relay Company AC-PRO-II, Instruction Manual

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Summary of Contents for AC-PRO-II

Page 1: ...8 8 8 2 8 9 2 8 6 4 www u t i l i t y r e l a y c o m I A C P R O I I A CT R I PUNI T A C P R O I I S T A T E O F T HE A R T T E C HNO L O G Y F O R L O W V O L T A G E C I R C UI T B R E A K E R R E...

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Page 3: ...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 Slug...

Page 4: ...t 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...

Page 5: ...tective 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...

Page 6: ...R2 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...

Page 7: ...tch should be placed in the ON position only if the trip unit is the last in the RS 485 communications wiring run G Red PICK UP LED This LED will illuminate if the current exceeds the LT pick up setti...

Page 8: ...utilityrelay com Page 6 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 AC PRO II Trip Unit Local Display Trip Unit Wi...

Page 9: ...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 conne...

Page 10: ...at bottom shown with wiring cover off 1 Auxiliary Terminal Block a Configurable alarm relay output b Ground Fault Defeat input c Breaker position contact input 2 QUICK TRIP connector 3 24VDC Auxiliary...

Page 11: ...Instruction Manual www utilityrelay com Page 9 Figure 5 2 Voltage Divider Module VDM External Connections Voltage Divider Module VDM External Connections Voltage Divider Module VDM Mounted on Back of...

Page 12: ...ame 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 w...

Page 13: ...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 diagr...

Page 14: ...is open or 52b contact normally closed when the breaker is open The RS 485 communications terminal block on the AC PRO II provides communication using the industry standard MODBUS RTU protocol throug...

Page 15: ...tons 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...

Page 16: ...ious screen or previous setting Exit Return to the Main Screen Up Increase setting value or toggle to next setting value Down Decrease setting value or toggle to previous setting value ON Turn functio...

Page 17: ...S 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 I...

Page 18: ...ored in the trip history Additionally the breaker clearing times for non instantaneous trips are stored Refer to Section 12 0 for details regarding trip history and navigating the trip history menu In...

Page 19: ...n 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...

Page 20: ...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...

Page 21: ...in position Figure 7 3 QUICK TRIP Switch Mounting 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 pr...

Page 22: ...s relief and Instructions in a durable waterproof case Figure 9 1 SAFE T TRIP Figure 9 2 SAFE T TRIP in case The AC PRO II patented Sluggish Breaker Detection feature captures the breaker clearing tim...

Page 23: ...l 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 availab...

Page 24: ...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 pl...

Page 25: ...p 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 matc...

Page 26: ...nter Back 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 time...

Page 27: ...T 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 s...

Page 28: ...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 NOTE On a 4 wire system a neutral CT must be inst...

Page 29: ...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 Us...

Page 30: ...tch 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 Ch...

Page 31: ...me ST Short Time I Instantaneous I OVRD Instantaneous Override I CLOS Instantaneous on Close GF Ground Fault NOL Neutral Overload QT I QUICK TRIP Instantaneous QT GF QUICK TRIP Ground Fault UV Under V...

Page 32: ...lay 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 More XXX Br...

Page 33: ...he 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 p...

Page 34: ...e powered via 24VDC or the USB port When the AC PRO II is set for residual GF protection the trip unit calculates ground fault current With GF Pick Up and Delay set to the required values primary inje...

Page 35: ...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 conn...

Page 36: ...anel 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 B 292 Secondary Injection Test Set...

Page 37: ...0 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 1...

Page 38: ...nches 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 Di...

Page 39: ...ands Long Time LT Short Time ST with I T ON Ground Fault GF with I T ON Neutral Overload NOL are based on the following equation I T Constant Where I is current in amps T is time to trip in seconds ce...

Page 40: ...Band Constant NOTE The ST Time Band Constant TBCST 40 for the 40S Time Band 30 for the 30S Time Band 20 for the 20S Time Band 15 for the 15S Time Band 10 for the 10S Time Band 7 for the 07S Time Band...

Page 41: ...s of Long Time Pick Up 20X 2X 01 150 1X I Pick Up 6X 4X 1200 10X 2 0 s SECONDS 1 10 4 0 s I 2 0 s I T O N 1 5 s I T O N T O N 2 2 3 0 s I T O N 2 2 1 5 SECONDS without I ST Delay with 2 T 1 1200 ST Pi...

Page 42: ...lt 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 XGF 0 5 0 25 0 288 sec IN SUMMARY To calculate the GF I2 T trip time 1 De...

Page 43: ...g 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 1...

Page 44: ...s 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...

Page 45: ...steps Current in Multiples of Long Time Pick Up 20X 2X 01 150 1X QT I Pick Up 6X 4X 1200 10X 1 5 1 5 Quick Trip Instantaneous Time Current Curve Quick Trip Instantaneous 150 to 1200 of SECONDS 1A ste...

Page 46: ...ondition 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 cond...

Page 47: ...ntact 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...

Page 48: ...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...

Page 49: ...AC PRO II Instruction Manual www utilityrelay com Page 47 Figure 23 1 InfoPro AC Readings Tab Screenshot Figure 23 2 InfoPro AC Waveform Tab Screenshot...

Page 50: ...AC PRO II Instruction Manual www utilityrelay com Page 48 Figure 23 3 InfoPro AC Trip History Tab Screenshot Figure 23 4 InfoPro AC Settings Tab Screenshot...

Page 51: ...cally 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 ins...

Page 52: ...ming 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 th...

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