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.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

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

2. 4

   Check all input fuses for continuity and proper rating.

3. 5

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

4. 6

   Check the rectifying bridge for proper operation.