Rockwell Automation 1502 400 Amp Medium Voltage Contactor (Series D) - Manual (Page 49)

Chapter
5
Troubleshooting
If an operating problem occurs, use the following troubleshooting chart to
isolate the cause of the failure and find corrective action. If the corrective
action fails to resolve the problem, consult your local Rockwell Automation
field support representative.
Table 5.A – Troubleshooting
SYMPTOM POSSIBLE CAUSE REMEDY
Contactor Chatters
• Loose connections in control circuit
• Coil leads reversed
• Control voltage too low
• Faulty hold-in coil
• Foreign material on magnet
• 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.
• Measure control voltage. Refer to Contactor
Specifications for minimum pick-up voltage.
• Clean magnet cores and armature.
• Check set-up of auxiliary contact assembly.
• Check contact cartridges on contactor.
• Check CR1 and CR1 relay.
Coil Burnout
• Coil leads improperly wired
• Improper set-up of auxiliary contact
assembly
• Control voltage too high
• Check wiring from the coil to the terminal block
assembly.
• Check set-up of auxiliary contact assembly.
• Check for correct control voltage.
Contactor does not energize
• Loose connections in control circuit
• Damaged auxiliary contacts
• Control voltage too low
• Improper set-up of auxiliary contact
assembly
• Faulty CR1 or CR2 interposing relay
• Check all connections in control circuit for
tightness. Check wiring from the coil to the
terminal block assembly.
• Replace auxiliary contact assembly.
• Measure control voltage. Refer to Contactor
specifications for minimum pick-up voltage.
• Check set-up of auxiliary contact assembly.
• Check CR1 and CR2 relay.
If faulty contactor coils are the suspected cause of malfunction, please refer to
Table 5.B for typical coil impedance values and check the contactor coils.
Table 5.B – Typical Contactor Coil Impedance Values
Coil Part Number Description Impedance ( Ω ) ™
80153-576-51 Closing Coil (electrically held) – 120 V AC 14.8
80153-575-51 Hold-in Coil (electrically held) – 120 V AC 826.0
80153-576-52 Closing Coil (electrically held) – 230 V AC 25.0
80153-575-52 Hold-in Coil (electrically held) – 230 V AC 1960.0
80154-134-51 š Closing Coil (mechanical latch) – 120 V AC 9.4
80025-833-01 š Trip Coil (mechanical latch) – 120 V AC 21.0
™ Impedance values listed have a tolerance of ± 10%. Refer to Chapter 3 for measurement points at the contactor receptacle.
š Supplied with mechanical latch option only.
1502-UM050D-EN-P – June 2013