LOOP CONTACTOR FAULT

What does 402 mean?

The Loop Contactor auxiliary contact failed to pick up or drop out within the designated time, as requested by the DSD 412 drive. The detection time is set by Function #102, which can be 450ms or 3 seconds.

• Defective Loop Contactor Auxiliary contact (check feedback at TB1-7).
• Defective Contactor (open coil or mechanical binding).
• Defective Pilot Relay LPR.
• Interference from other elevator relay contact circuits.
• Function #102 not set correctly for contactor type (e.g., small vs. large HP drives).

Click steps to track your progress.

1. 1

   Check for proper feedback at TB1-7 for the Loop Contactor Aux contact.

2. 2

   Check the contactor for an open coil or mechanical binding.

3. 3

   Check the Pilot Relay LPR for defects.

4. 4

   Identify and resolve interference from other elevator relay contact circuits.

5. 5

   If using large contactors with large HP drives, set Function #102 to 1 (On) for a 3-second fault detection time; otherwise, set to 0 (Off) for 450ms.