MOL Contact Fault

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This fault occurs when the Motor Overload (MOL) digital input is activated, indicating an overload condition detected externally or a misconfiguration of the input logic. The MOL input acts as a safety interlock to protect the motor from damage due to excessive thermal or current loading.

• External motor overload relay (connected to the MOL input) tripped due to an actual motor overload condition.
• Incorrect configuration of the digital input assigned as MOL (e.g., parameter P0-19 DI Function) resulting in unintended activation.
• Open circuit in the wiring to the MOL digital input, if configured as a normally closed (NC) contact.
• Faulty external overload relay or wiring causing a false trip signal to the MOL input.
• Contactor chatter or auxiliary contact bounce triggering the MOL input intermittently.

Klicken Sie auf Schritte, um Ihren Fortschritt zu verfolgen.

1. 1

   1. Inspect the external motor overload relay (thermal or electronic) for a tripped status indicator and reset it if necessary.

2. 2

   2. Verify parameter P0-19 (DI Function) or similar parameter for the MOL input is correctly configured for the desired normally open (NO) or normally closed (NC) logic.

3. 3

   3. Measure the continuity of the external MOL contact and its wiring back to the drive's digital input terminal to ensure a proper signal path.

4. 4

   4. Check the motor's actual current draw using a clamp meter at the drive output (T1/U, T2/V, T3/W) to determine if a true overload condition exists (compare to P0-03).

5. 5

   5. Temporarily bypass the MOL input by removing its wiring from the drive terminal (ensure safety procedures are followed) to confirm if the fault clears.