Control Power Supply Voltage Fault

What does Uv2 mean?

The voltage supplied to the control drive input power is too low. This can occur if parameter L2-02 is changed from its default value without installing a Momentary Power Loss Ride-Thru unit, or if there is damage to the control power supply wiring or internal control circuitry, impacting drive control stability.

• External 24VDC control power supply failing or providing unstable voltage.
• Internal control power supply failure within the drive's control board.
• Incorrect control voltage parameter (L2-02) for the installed hardware configuration (e.g., without a Momentary Power Loss Ride-Thru unit).
• Loose or corroded connections in the control power wiring.
• Overload condition on the drive's internal 24VDC output for external devices.

Click steps to track your progress.

1. 1

   1. Measure the voltage at the dedicated control power input terminals (e.g., 24VDC, R1/S1/T1 for control board) using a multimeter.

2. 2

   2. Verify the external control power supply (if used) is providing stable voltage and sufficient current capacity.

3. 3

   3. Check parameter L2-02 to ensure it is set correctly for the drive's configuration (e.g., default value or specific for ride-thru unit).

4. 4

   4. Inspect the control board for any signs of internal voltage regulator failure or physical damage.

5. 5

   5. Ensure all control wiring connections are secure and free of corrosion.

6. 6

   6. If parameter L2-02 was intentionally modified, revert it to default or install the appropriate Momentary Power Loss Ride-Thru unit as required.