Input Phase Failure

What does 10 mean?

An external electronic monitoring relay has detected an undervoltage, incorrect phase sequence, or a phase failure in the input line. The minimum threshold values are 360Vac for 400-500Vac supply and 470Vac for 525-690Vac supply, with a 0.1-second response delay. Possible causes include a missing supply phase, a blown supply fuse, incorrect mains cabling, or a grid interruption. Subcodes S1 (phase supervision diode supply) and S2 (phase supervision active front end) are available.

• Loss of one or more phases on the main AC power input (P0303).
• Internal rectifier failure.
• Loose or disconnected input power wiring.

Click steps to track your progress.

1. 1

   Check the settings of the External Monitoring Device (EMD) relay for correct undervoltage thresholds, phase sequence, and response delay.

2. 2

   Verify the signal wiring from the EMD relay to the control unit.

3. 3

   Measure the incoming supply voltage at the drive input terminals across all three phases.

4. 4

   Check all input fuses for continuity and proper rating.

5. 5

   Inspect the mains cabling for correct phase connections and signs of damage.

6. 6

   Check the rectifying bridge for proper operation.