Rockwell Automation 193-EC4 EC4 Current Monitoring Relay User Manual - Manual (Page 114)

Rockwell Automation Publication 193-UM011A-EN-P - September 2010 115
Troubleshooting Chapter 11
Resetting a Trip
An EC4 Current Monitoring Relay trip condition can be reset by taking one of
the following actions:
1. Actuating the TRIP/RESET button on the EC4 Current Monitoring
Relay.
2. Setting the Fault Reset bit in the EC4 Current Monitoring Relay’s Output
Assembly via the DeviceNet network.
3. Actuating a reset signal
a. Actuating a reset signal to IN1 when Parameter 77,
IN1=Trip Reset, in enabled (Series
A, FRN 2.xxx).
b. Actuating a reset signal to one of the inputs when programmed to “Trip Reset” via
one of the corresponding assignment parameters (83…86)
4. Cycling supply power to the EC4 Current Monitoring Relay to clear
Non-Volatile Faults.
5. Setting Parameter 26, Trip Reset, to a value of 1 = trip reset.
Trip/Warn LED
Troubleshooting
Procedures The following table lists the possible causes for each trip type and the
recommended action to take.
ATTENTION: Resetting a trip will not correct the cause for the trip.
Corrective action should be taken before resetting the trip.
Table 24 - Trip/Warn LED Troubleshooting Procedures
Trip
Description Possible Cause Corrective Action
Test Trip 1. Operation of the Test/Reset button 1. Operate the Test/Reset button to clear the trip.
Undercurrent 1. Load under powered
2. Improper parameter settings
1. Check and correct source of overload (load, mechanical transmission
components, motor bearings).
2. Set parameter values to match the motor and application
requirements.
Overcurrent 1. Load over powered
2. Improper parameter settings
1. Check and correct source of overload (load, mechanical transmission
components, motor bearings).
2. Set parameter values to match the motor and application
requirements.
Ground Fault 1. Power conductor or motor winding is shorting to ground
2. Motor winding insulation is decayed
3. Foreign Object short
4. External ground fault sensor (core balance current
transformer) has improper connection
1. Check power conductors and motor windings for low resistance to
ground.
2. Check motor winding insulation for low resistance to ground.
3. Check for foreign objects.
4. Check cable connections.
Comm Fault 1. Communication disruption 1. Check the DeviceNet cabling for a wiring disconnection.
Comm Idle 1. Programmable controller processor set to the “program”
mode.
1. Reset trip after the programmable controller process is returned to
the “run” mode.
NonVol
Memory Fault 1. Internal product failure 1. Consult the factory.
Hardware
Fault (trip) 1. Hardware configuration failure 1. Verify that the input terminals (1,2,3,4,5 or 6) are not shorted at the
PTC terminals (IT1, IT2).
2. Consult the factory.