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     LV-     

575

 x 0.90 = 

51

7

     HV-    

575

 x 1.10 = 

632

     VUB-  Manufacturer suggest 5%

     MULT-From Table No. 1, MULT = 2 (2 conductors, 1 loop)

     OC-    Service Factor Amperage = 18.2

     UC-    FLA x 0.80 = 15.9 x 0.80 = 12.7

     CUB-  Manufacturer suggest 5%  

     TC-     TC = 010 (To program RD1 and RD2), then TC = J00

     RD1-  To protect the pump from rapid cycling and reduce the number of  

                starts per hour, RD1 = 10 (Display value) x 0.5 = 5 

seconds

.

      RD2-  Since the motor is small and submerged in water it will 

               generally cool off quickly, RD2 = 10 x 0.5 = 5 Minutes.

      MA-    MA = 64 (Displayed value) x 0.158 = 10.1 Seconds.

      OCTD-OCTD = 10 (Displayed value) x 0.158 = 1.58 Seconds.

      RD3-   The well history shows that it will fully recover in 2 hours.  

                  RD3 = 240 x 0.5 = 120 Minutes

      #RU-    In this application, we know that the well will eventually recharge  

                  itself, #RU = A.

     #RF-    This well is known for sand to jam the impeller, therefore “oc”  

                  should be included so that the pump will attempt to automatically  

                  restart after an overloaded condition.  History shows that 1 start  

                  attempt usually clears the sand out of the impeller.  #RF = oc1

                  UCTD-  UCTD = 10

      GF-      Because it may take several days to get a new pump motor and  

                  schedule for maintenance personnel to remove and replace the  

                  pump motor, GF setting of 10% of full load amperage will give the  

                   well owner enough time to prepare for pump replacement. 

                   GF = 56.2A x 0.10 = 5.6 

 

#2

- Motor To Be Protected: 3Ø, 460 Volt, 25 Hp air compressor with a full load    

amperage rating of 34A and maximum service factor amps of 37.4.  Use the  

 

following calculations and reasoning to determine the appropriate settings 

for this application.

     LV-      

575

 x 0.90 = 

517

     HV-     

575

 x 1.10 = 

632

     VUB-  Standard NEMA motor = 5

     MULT-From Table No. 1 = 1

     OC-    Service Factor Amperage = 37.4 

     UC-    FLA x 0.80 = 34A x 0.80 = 27.2

     CUB- Standard NEMA motor = 5

     TC-    General purpose motor = 20

     RD1- Since this compressor takes about 10 seconds to bleed off excess  

               pressure after a shutdown, setting RD1 = 20 will allow the  

 

               compressor to unload before being restarted.

    RD2-   Because the motor may be hot from running in an unbalance or   

                single phase condition, a motor cool down time of 10 minutes, 

                RD2 = 10, should be appropriate. 

07/25/03 

 

 

 

                 -10-

Summary of Contents for 777-575-FT

Page 1: ...t motor conductor i e the A phase conductor should go through the A round hole See Figure 1 for a typical wiring diagram 2 2 For amperages less than 26 amps loop the motor conductors according to Tabl...

Page 2: ...IAGRAM FOR 26 90 FLA FULL LOAD AMPS NUMBER OF LOOPS NUMBER OF CONDUCTORS THROUGH A B and C MULT PROGRAM SETTING 2 0 2 5 9 10 10 2 6 3 0 8 9 9 3 1 3 5 7 8 8 3 6 4 0 6 7 7 4 1 5 0 5 6 6 5 1 6 0 4 5 5 6...

Page 3: ...RMS 600 VAC MAX SYMCOM INC 800 243 8848 RAPID CITY SD IND CONT EQ LISTED 784X LR46510 L1 L2 L3 NO C NC MODEL 777 FT OVERLOAD RELAY 20 90A RESET PROGRAM RD3 RF VUB OC RU ADDR MULT RD2 KWS HV LKW RD1 C...

Page 4: ...GRAM adjustment is between approximately 7 O Clock and 11 O Clock Likewise the ADDR setting will only be programmed when the DISPLAY PROGRAM adjustment is between approximately 11 O Clock and 5 O Cloc...

Page 5: ...ection for the application All parameters are actual values except the VUB and CUB settings which are percentages The range these parameters can be programmed to is found in the specifications at the...

Page 6: ...consulted for OC settings However OC is typically between 110 and 125 of Full Load Amperage FLA UC The UC undercurrent setting is typically set to 80 of full load amperage FLA The overload relay with...

Page 7: ...rip mode TC J00 the RD1 position becomes the motor acceleration time To view and adjust MA TC must be J00 The motor acceleration time is related to the load on a motor For high inertia loads such as f...

Page 8: ...The following settings are available 0 1 oc1 2 oc2 3 oc3 4 oc4 A and ocA A setting which includes oc will allow the overload relay to automatically reset after an overload fault eg a setting of oc2 w...

Page 9: ...bled 1 minute after the motor starts and provides a 2 second trip time for motors exceeding 400 SFA regardless of trip class J00 Fast Linear Trip Mode This setting provides an adjustable linear trip t...

Page 10: ...s that 1 start attempt usually clears the sand out of the impeller RF oc1 UCTD UCTD 10 GF Because it may take several days to get a new pump motor and schedule for maintenance personnel to remove and...

Page 11: ...label The multi function display also announces system faults such as low voltage high voltage single phasing unbalance and reverse phasing errors Any time the MODE SELECT switch is in the RUN positio...

Page 12: ...img down RD2 before restarting Display alternates uc with RUN The overload relay has tripped on undercurrent and is timing down RD3 before restarting If undercurrent is not a normal condition for this...

Page 13: ...computer Control and monitoring is also possible from SymCom s RM 1000 and RM 2000 PLC and SCADA systems using the RS 485 standard and MODBUS protocol can also be used NOTE An RS 485MS 2W module is r...

Page 14: ...ust the Display Program adjustment until cLr appears on the display Release the Reset Program Button To verify the last fault was cleared place the Mode Select switch in the Run position Then press an...

Page 15: ...urrent 15 Timing 5 1 second Repeatability Voltage 0 5 of nominal voltage Current 1 of nominal current TRIP TIMES Those not shown have user selectable trip times Ground Fault Trip Time 101 200 of Setpo...

Page 16: ...Compliance to a Level of 6 KV Line to Line Hi Potential Test Meets UL508 2 x Rated Voltage 1000 Volts for 1 Minute Vibration IEC 68 2 6 10 55 Hz 1 mm Peak to Peak 2 Hours 3 Axis Shock IEC 68 2 27 30...

Page 17: ...h 0 315 Seconds RD2 Motor Cool Down Timer 2 500 Minutes x 0 5 if TC J00 OCTD Overcurrent Trip Delay Linear 2 250 x 0 158 0 315 Seconds RD3 Dry Well Recovery Timer 2 500 Minutes x 0 5 if TC J00 RU Numb...

Page 18: ...DISPLAY MESSAGE RESET PROGRAM 800 843 8848 SYMCOM INC RAPID CITY SD DIMENSIONS 07 25 03 18...

Page 19: ...sions 18 Fast Linear Trip Mode 5 Multi Function System Display 11 Operation 2 Programmable Operationg Points 17 Programming Examples 9 Programmable Parameters 5 Programming 4 Remote Reset 13 Specifica...

Page 20: ...2880 North Plaza Drive Rapid City SD 57702 Phone 800 843 8848 or 605 348 5580 FAX 605 348 5685 Visit our website at www symcom com for our complete catalog and new product listings...

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