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| No Action at the Three-Phase Motor |
Supply Fuse or Breaker Magnetic Starter Contacts &/or Coil Open Control Circuit |
| Motor Hums or Rotates Slowly (10% rated speed) |
Power Pack Potential (N/C) Relay Contacts &/or Coil Starting Contactor Contacts &/or Coil Magnetic Starter Contacts &/or Coil Motor Windings Shorted or Open Incorrect Motor Connections Motor Bearings Defective Start Capacitors Shorted or Open Run Capacitors Shorted or Open Excessive Start Capacitors Single Phase Voltage Too High |
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Motor Doesn't Reach full Speed (75% rated speed)
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Potential (N/C) Relay Contacts &/or Coil Starting Contactor Contacts &/or Coil Incorrect Motor Connections
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| Motor Starts & Runs But Heaters Trip Out |
Magnetic Starter Contacts &/or Coil Motor Windings Shorted or Open Incorrect Motor Connections Motor Bearings Defective Motor Overload Run Capacitors Shorted or Open Excessive Run Capacitors Single Phase Voltage Too Low Single Phase Voltage Too High |
| Motor Heats Abnormally |
Magnetic Starter Contacts &/or Coil Motor Windings Shorted or Open Incorrect Motor Connections Motor Bearings Defective Overloaded Motor Run Capacitors Shorted or Open Excessive Run Capacitors Single Phase Voltage Too Low Single Phase Voltage Too High |
| Magnetic Starter Does not Pull In |
Supply Fuse or Breaker Magnetic Starter Contacts &/or Coil Open Control Circuit Run Capacitors Shorted or Open |
| Voltage On Two Lines Only |
Supply Fuse or Breaker Potential (N/C) Relay Contacts &/or Coil Starting Contactor Contacts &/or Coil Magnetic Starter Contacts &/or Coil Motor Windings Shorted or Open Start Capacitors Shorted or Open |
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Much Smaller Current From Produced Phase (Starting) |
Run Capacitors Shorted or Open |
| Much Smaller Current From Produced Phase (Running) |
Overloaded Motor Run Capacitors Shorted or Open Single Phase Voltage Too Low |
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Current in Produced Phase High (With Load)
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Excessive Start Capacitors |
| Starting Contactor Doesn't Close When Starting |
Supply Fuse or Breaker Potential (N/C) Relay contacts &/or Coil Starting Contactor Contacts &/or Coil Run Capacitors Shorted or Open Single Phase Voltage Too Low |
| Starting Contactor Doesn't Open When up to Speed |
Power Pack Potential (N/C) Relay Contacts &/or Coil Starting Contactor Contacts &/or Coil Motor Windings Shorted or Open Motor Windings Shorted or Open Overloaded Motor Start Capacitors Shorted or Open Excessive Start Capacitors Single Phase Voltage Too High |
| Chattering Potential Relay or Starting Contactor |
Supply Fuse or Breaker Potential (N/C) Relay contacts &/or Coil Power Pack Motor Windings Shorted or Open Overloaded Motor Start Capacitors Shorted or Open Run Capacitors Shorted or Open Single Phase Voltage Too High |
| Pilot Light Stays On |
Power Pack Potential (N/C) Relay contacts &/or Coil Starting Contactor Contacts &/or Coil Motor Windings Shorted or Open Incorrect Motor Connections Overloaded Motor Start Capacitors Shorted or Open Excessive Start CapacitorsSingle Phase Voltage Too High |
| Pilot Light Does Not Come On |
Supply Fuse or Breaker Power Pack Potential (N/C) Relay Contacts &/or Coil Motor Windings Shorted or Open
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| Run Capacitors Repeatedly Defective |
Single Phase Voltage Too High
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| Electrolytic (static) Capacitors Repeatedly Defective |
Power Pack Potential (N/C) Relay Contacts &/or Coil Starting Contactor Contacts &/or Coil Magnetic Starter Contacts &/or Coil Motor Windings Shorted or Open Incorrect Motor Connections Overloaded Motor Run Capacitors Shorted or Open Excessive Start Capacitors Single Phase Voltage Too High |