Undervoltage

What does Uv1 mean?

The drive detected an undervoltage condition in the main circuit power supply. This indicates that the incoming AC voltage is below the acceptable operating threshold.

Click steps to track your progress.

1. 1

   Measure the incoming AC line voltage (L1, L2, L3) at the drive's input terminals (R/L1, S/L2, T/L3) and compare it against the drive's nominal voltage rating and acceptable operating range.

2. 2

   Inspect all power wiring connections from the main disconnect/circuit breaker to the drive's input terminals for tightness and integrity.

3. 3

   Verify the main power supply circuit breaker or fuses feeding the drive for proper rating and operational status (e.g., trip status, continuity).

4. 4

   Check for voltage sags or brownouts on the incoming power supply, especially under load conditions, using a multimeter with min/max function or a power quality analyzer if available.