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SymCom MotorSaver 777-MV-FT Installation Instructions Manual

Overload relay
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BE SURE POWER IS DISCONNECTED PRIOR TO INSALLATION!
FOLLOW NATIONAL, STATE, AND LOCAL CODES!
READ THESE INSTRUCTIONS ENTIRELY BEFORE INSTALLATION!
SymCom's electronic overload relays are fully programmable for customized
protection with a digital readout and RS-485 communications. The 777-MV-FT
is designed for use, in conjuction with power transformers and external current
transformers, on medium voltage systems. The 777-MV-FT also has a fast linear
trip mode.
CONNECTIONS
1. Using the four corner tabs or the DIN rail mounting bracket, mount the
unit near the magnetic contactor. To use the DIN rail bracket,
hook the top clip first, then apply downward pressure until the lower clip
"clicks" onto the rail.
2. External current transformers must be used (see Figure No. 1 and Table
No. 1). SymCom recommends that the external CTs have terminals for
installation convenience. All CTs must be facing the same direction and all
CT secondaries must be wired identically (i.e., all "+" terminal connected
wires must enter the loop window from the same side).
3. Power input to unit may be three-phase or single-phase. Three-phase inputs
to the unit should have instrument transformers with 120 VAC secondaries,
5 VA minimum. A separate power supply potential transformer should be
used to power the contactor coil because its signal will vary as the load is
energized and de-energized.
3.1.Three-phase voltage input: 120V three-phase can be made available by
using three potential transformers in a wye-wye configuration. Reverse
phase, single-phase and unbalance protection is available when
using the wye-wye configuration shown in Figure 2a. The motor will not start
under the above voltage fault conditions. Connect the three-phase power
from the secondary of the potential transformers to "L1", "L2" and "L3" on the
unit using a #12 - #18 AWG wire.
3.2.Three-phase voltage input: Alternatively, a three-phase voltage input may
be constructed by connecting two potential transformers in an open delta
configuration (See Figure 2b).
INSTALLATION INSTRUCTIONS
FOR SYMCOM'S OVERLOAD RELAY
MODEL 777-MV-FT
2880 North Plaza Drive, Rapid City, SD 57702 • (800) 843-8848

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Summary of Contents for SymCom MotorSaver 777-MV-FT

  • Page 1 “clicks” onto the rail. 2. External current transformers must be used (see Figure No. 1 and Table No. 1). SymCom recommends that the external CTs have terminals for installation convenience. All CTs must be facing the same direction and all CT secondaries must be wired identically (i.e., all “+”...
  • Page 2 TABLE NO. 1: EXTERNAL CT SELECTION Operation The relay operation of SymCom’s overload relays is a fail safe design. This means when everything is within the limits programmed into the unit, the relay will energize; the normally open (NO) contact will close and the normally closed (NC) contact will open.
  • Page 3 FIGURE 1: TYPICAL WIRING DIAGRAM USING EXTERNAL CTs NOTE: All potential transformers have 120VAC secondaries. The unit may be installed with three-phase voltage input (Figure No. 2,A & B); for full voltage monitoring and protection. If the single-phase voltage input is used (Figure No.
  • Page 4 The “MULT” setting must be programmed before any of the current settings to ensure proper display of actual current setpoints. Therefore, SymCom recommends programming the “LV” setting first, then move clockwise through the postions to complete the process.

  • Page 5: Programmable Parameters

    FAST LINEAR TRIP MODE The Fast Linear Trip Mode provides an adjustable linear trip that can be used for very quick or very slow trips. The Model 777-FT family offers superior protection for sensitive motors, quick trips in test panels, and fast trips to protect high torque systems.
  • Page 6 Maximum Deviation from the Average x 100 Percent Unbalance = Average Example: The measured line-to-line voltages are 203, 210, and 212. 203 + 210 + 212 = 208.3 Average = The maximum deviation from the average is the largest difference between the average voltage (208.3) and any one voltage reading.
  • Page 7 RD1- “RD1” is the rapid cycle timer. To view and adjust RD1, TC must not be J00. It will engage when the motor is first powered-up or after the motor controls shut down the motor. An “RD1” setting of 20-30 minutes will generally protect the motor from rapid, successive power outages or short cycling caused by the motor controls.
  • Page 8 RD3- “RD3” is the restart delay after an undercurrent. It is also known as a dry well recovery timer and is usually used in submersible pumping applications. The setting of “RD3” depends on the recovery time of the water well and varies widely from application to application. Note: In linear trip mode (TC = J00), the RD3 time is appoximately 50% of the normal RD3 time.

  • Page 9: Programming Examples

    Trip Class Application Description Small fractional horsepower motors where acceleration times are almost instantaneous or where extremely quick trip times are required. (Fast Trip) Hermetic refrigerant motors, compressors, submersible pumps, and general purpose motors that reach rated speed in less than 4 seconds. Certain specialized applications.
  • Page 10 120 x 0.90 = 108 120 x 1.10 = 132 VUB- VUB = 5 MULT- From Table No. 1, MULT = 75 with 75:5 CTs Service Factor Amperage = 61.6 FLA x 0.80 = 56.2 x 0.80 = 45.0 CUB- Manufacturer suggests 5 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 Minutes.
  • Page 11 RD2 = 10, should be appropriate. RD3/#RU-Because an undercurrent would signal a serious problem in this application (a broken shaft or belt), #RU should be set = 0 for a manual reset. Therefore, RD3 does not have any function. #RF- Because an overload (overcurrent) fault signals a serious problem in this application (e.g., worn bearings), “oc”...

  • Page 12: Troubleshooting

    The unit has tripped on a single phasing of the current, but was Display is showing a solid “CF”. not single phased by the incoming power. Check for damaged contacts or loose wiring. Any questions or comments call SymCom at 1-800-843-8848 or 1-605-348-5580 06/26/03 -12-...
  • Page 13 MODBUS protocol. This standard allows up to 99 Model 777- MV-FTs to be controlled and monitored from a single remote personal 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.
  • Page 14 (5) years* from the date of manufacture. All other products manufactured by SymCom shall be warranted against defects in material and workmanship for a period of two (2) years from the date of manufacture. For complete information on warranty, liability, terms, and conditions, please refer to the SymCom Terms and Conditions of Sale document.

  • Page 15: Specifications

    SPECIFICATIONS ELECTRICAL 115 - 230 VAC, 1∅ OR 115 - 230, 3∅ Input Voltage (Programmable) Frequency 50 - 60 Hz Motor Full Load Amp Range 12.5 - 600 Amps, 3∅ (external CT’s) Power Consumption 10 W (Maximum) Pilot Duty Rating: 480 VA @ 240 VAC Output Contact Rating SPDT (Form C) General Purpose: 10 A @ 240 VAC Expected Life...
  • Page 16 Standards Passed Electrostatic Discharge (ESD) IEC 1000-4-2, Level 3, 6 KV Contact, 8 KV Air Radio Frequency Immunity (RFI), IEC 1000-4-6, Level 3 10 V/M Conducted Radio Frequency Immunity (RFI), Radiated IEC 1000-4-3, Level 3 10 V/M Fast Transient Burst IEC 1000-4-4, Level 3, 3.5 KV Input Power Surge 1000-4-5...
  • Page 17 10 - 20% of CT Primary or OFF GF - Ground Fault Current Threshold NOTES: SymCom’s Overload Relay can be preprogrammed prior to installation by applying 120 VAC between the L1 and L2 terminals. ** If J Prefix is displayed in trip class setting, jam protection is enabled.
  • Page 18 DIMENSIONS ������ ������ ������ ������� ������ ������ ������� ������� DISPLAY MESSAGE RESET/ PROGRAM SYMCOM, INC. 800-843-8848 RAPID CITY, SD ������ ������� ������ ������� ������ ������� ������ ������� �� ������ ������� ������ �������� ������ �������� ������ ������� ������ ������� 06/26/03 -18-...
  • Page 19 INDEX Clear Last Fault Communications Port Connections Dimensions Fast Linear Trip Mode Multi-Function System Display Operation Programmable Operationg Points Programming Examples Programmable Parameters Programming Remote Reset Specifications Tamper Guard Troubleshooting Warranty...
  • Page 20 Visit our website at www.symcominc.com for our complete catalog and new product listings! 2880 North Plaza Drive, Rapid City, SD 57702 Phone: (800) 843-8848 or (605) 348-5580 FAX: (605) 348-5685...