LV1-Trip (Low voltage supply undervoltage)

What does 121 mean?

This fault indicates an undervoltage condition in the low voltage supply for the KPS-600. This means the control power supply voltage is below the operational threshold, which can affect control unit stability and lead to unexpected shutdowns or erratic behavior.

• LV1-Trip: Low voltage detected on the main supply (P1-18).
• AC mains voltage below operational threshold.
• Undersized power supply for the connected load.
• Voltage drop due to long cable runs or poor connections.

Click steps to track your progress.

1. 1

   Measure the control voltage supply (e.g., 24VDC) at the designated control input terminals.

2. 2

   Verify the output voltage of the external control power supply.

3. 3

   Inspect the control wiring for excessive voltage drop due to long cable runs or undersized wire gauge.