User Manual

ManualsBrandsRockwell Automation ManualsEquipment1502 Medium Voltage Contactor, 800A (Series D and E)

Chapter 5

Troubleshooting

If an operating problem occurs, use the following troubleshooting chart to

isolate the cause of the failure and nd the corrective action. If the corrective

action fails to resolve the problem, consult your local Rockwell Automation eld

support representative.

1502-UM051E-EN-P – June 2013

Table 5.A – Troubleshooting (Series D contactors)



Symptom Possible Cause Remedy

Contactor

chatters

• Loose connections in control circuit

• Improper control wiring

• Control voltage

• Mechanical latch not engaging

• Improper set-up of auxiliary contact

assembly

• Faulty auxiliary contacts

• Faulty CR1 or CR2 interposing relay

• Check all connections in control circuit for tightness.

Check wiring from the coil to the terminal block assembly.

• Check wiring per schematic.

• Measure control voltage. Refer to Contactor Specifications

for minimum pick-up voltage.

• Check for free movement of latch lever.

• Check set-up of auxiliary contact assembly.

• Check master contact cartridges on contactor.

• Check CR1 and CR2 relay.

Coil burnout

• Coil leads improperly wired

• Control voltage too high

• Contactor operated too frequently

• Check wiring from the coil to the terminal block assembly.

• Check for correct control voltage

• Check switching frequency:

– 600 ops/hr electrically held

– 150 ops/hr mechanically held