LP1-Trip (Phase Failure)

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This fault indicates a phase failure. For the KPS-600, it specifically refers to a mains phase failure, meaning an issue with the incoming AC power supply. For KSDs, it indicates a motor phase failure, meaning one or more phases supplying the motor are missing or unbalanced. Both conditions prevent proper operation and lead to drive shutdown.

• LP1-Trip: Phase failure detected on the main power supply (P1-17).
• Loss of one or more phases from the AC mains.
• Blown fuse in one of the supply phases.
• Internal wiring issue to the power input terminals.

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1. 1

   Measure the voltage of each incoming AC mains phase (L1-L2, L2-L3, L3-L1) at the drive input terminals.

2. 2

   Verify voltage balance between phases — expect less than 2% deviation.

3. 3

   Measure the voltage of each motor output phase (U-V, V-W, U-W) during a run command.

4. 4

   Inspect all power connections from the mains supply to the drive and from the drive to the motor for tightness and corrosion.