Control Circuit Undervoltage

What does UV2 mean?

This fault indicates that the internal control power supply voltage within the inverter has dropped below its acceptable level. This often points to an issue with the inverter's internal power supply board or auxiliary power components. When the control circuit loses stable power, the inverter cannot operate reliably or safely, leading to a complete shutdown.

Complete Troubleshooting Guide

1. 1

   Check the incoming AC line voltage for stability; sags can affect internal power supplies.

2. 2

   Inspect for any loose connections to control terminals or internal wiring that might be drawing excessive current or causing a voltage drop.

3. 3

   Verify that no external control devices are drawing excessive current from the inverter's auxiliary power outputs.

4. 4

   Perform a power cycle of the inverter to reset internal control circuits.

5. 5

   If the fault persists, it may indicate an internal hardware failure requiring service or replacement of the inverter.