FIELD LOSS FAULT

What does 905 mean?

The field current feedback has dropped below 80% of the expected current under specific operating conditions: during Field Weakening Mode (top speed, parameter #49), Full Field Mode (acceleration or deceleration, parameter #50), or Standing Field Mode (not running, parameter #53). This fault will shut down the drive.

• Open circuit failure in the motor field winding or its associated wiring.
• Hardware failure within the motor field control circuitry.
• Loss of power or incorrect phasing supplied to the Field Rectifier.

Click steps to track your progress.

1. 1

   Inspect the motor field winding and wiring for any open circuits.

2. 2

   Check the power supply and phasing to the Field Rectifier for correct operation.

3. 3

   Test the motor field control circuitry for any hardware malfunctions.

4. 4

   Review parameters #49, #50, and #53 to ensure they accurately reflect the expected field current values for the respective operating modes.