Rockwell Automation 193-EC4 EC4 Current Monitoring Relay User Manual - Manual (Page 116)

Rockwell Automation Publication 193-UM011A-EN-P - September 2010 117
Troubleshooting Chapter 11
➊ FRN 2.000 and later.
Table 26 - Input and Output Troubleshooting Procedures
Failure
Type Failure Description Corrective Action
Input
1...4 Input 1,2,3 or 4 does not
appear to recognize a
contact closure 1. Check the supply voltage on the DeviceNet connector.
2. If the applicable contact closes but the EC4 Current Monitoring Relay Input does not recognize the closure, check
the continuity and wiring to the connected contact.
3. Check the IN 1,2,3 and 4 status LEDs. If the appropriate LED does not illuminate, measure the voltage across and
current through the applicable input. Verify they are within the ratings of the EC4 Current Monitoring Relay (See
Appendix A).
4. If the appropriate Input LED does illuminate, but the input status is not reported properly over the DeviceNet
network, check the programmable controller ladder logic and I/O mapping.
Input 1 Trip reset operation 1. Check the programming of Parameter 77, IN1=Trip Reset ➊
Trip
Relay The trip relay does not
appear to be functioning
properly 1. Check the TRIP/WARN and NETWORK STATUS LEDs, or the DEVICE STATUS and TRIP STATUS parameters. If a
Protection Fault exists, refer to the Trip and Warning troubleshooting procedure. If a DeviceNet-related fault
exists, refer to the DeviceNet troubleshooting procedure.
2. Press the Test/Reset button on the EC4 Current Monitoring Relay. The trip relay should open and the TRIP/WARN
LED should exhibit a single red flash code. Remove the control circuit power and measure the impedance across
terminals 95 and 96 to verify the trip relay contacts are open. Press the Test/Reset button again. The unit should
reset and the trip relay contacts should close. Measure across terminals 95 and 96 to ensure the trip relay
contacts closed.
3. Remove control circuit supply power and check the control wiring to the EC4 Current Monitoring Relay Trip Relay
(95/96).
Note: The E3 Trip Relay contacts will not close until 2.35 seconds after power is applied to the EC4 Current
Monitoring Relay DeviceNet connector. If a “Non-Volatile Fault” previously existed or a fault condition is present
during power-up, the trip relay contacts will not close until the fault condition is removed and the trip is reset.
OUT A
or OUT B Output A or Output B
does not appear to turn
on (close) when
commanded to do so 1. Check the supply voltage on the DeviceNet connector.
2. Check the OUTA and OUTB status LEDs. If the appropriate LED does not illuminate, check the programmable
controller ladder logic and I/O mapping.
3. If the appropriate Output LED is illuminated, remove the control circuit power and check for continuity across the
appropriate output terminals (13/14 for OUTA, 23/24 for OUTB). If the continuity test indicates the output is open,
replace the EC4 Current Monitoring Relay. Check the supply voltage against the ratings of the contactor and the
relay output before installing a new unit.
4. Remove control circuit power and check the control circuit fuse and the control wiring to the EC4 Current
Monitoring Relay output terminals.
5. Check the control circuit power supply. Verify the voltage is within the contactor and current monitoring relay
ratings.
6. Check the TRIP/WARN and NETWORK STATUS LEDs, or the DEVICE STATUS and TRIP STATUS parameters. If a
Protection Fault exists, refer to the Trip and Warning troubleshooting procedure. If a DeviceNet-related fault
exists, refer to the DeviceNet troubleshooting procedure.
7. Check the OUTA and OUTB Pr FltState, Pr FltValue, Dn FltState, Dn FltValue, Dn IdlState, and Dn IdlValue
programmable parameters. The Pr FltState and Pr Flt Value parameters supersede the Dn Flt or Dn Idle
parameters.
OUT A
or OUT B Output A or Output B
does not appear to turn
off (open) when
commanded to do so. 1. Check the OUTA and OUTB status LED’s. If the appropriate LED remains illuminated, check the programmable
controller ladder logic and I/O mapping.
2. If the appropriate Output LED is not illuminated, remove the control circuit power and check for continuity across
the appropriate output terminals (13/14 for OUTA, 23/24 for OUTB). If the continuity test indicates the output is
closed, replace the EC4 Current Monitoring Relay. Check the supply voltage against the ratings of the contactor
and the relay output before installing a new unit.
3. Remove control circuit power and check the control circuit fuse and the control wiring to the EC4 Current
Monitoring Relay output terminals.
4. Check the OUTA and OUTB Pr FltState, Pr FltValue, Dn FltState, Dn FltValue, Dn IdlState, and Dn IdlValue
programmable parameters. Then check the TRIP/WARN and NETWORK STATUS LEDs, or the DEVICE STATUS
and TRIP STATUS parameters. If a Protection Fault exists, refer to the Trip and Warning troubleshooting
procedure. If a DeviceNet-related fault exists, refer to the DeviceNet troubleshooting procedure.
OUT A
or OUT B The contactor
connected to Output A
or Output B appears to
“chatter” 1. Verify the OUT A or OUT B LED remains in the appropriate On or Off state. If the LED is flickering, check the
programmable controller’s ladder logic program.
2. Check the control circuit supply voltage. Verify it is within the ratings of the contactor coil and the current
monitoring relay’s outputs.
3. Remove the control circuit power. Verify all control wiring is properly secured.