What causes KUKA Robot alarm KRC0345?

Unstable or insufficient main power supply voltage below 380V AC (3-phase) or 110V AC (single-phase) specification. Loose or corroded electrical connections at the main power terminals or internal power module connectors. Faulty power distribution unit, circuit breaker, or power supply cable with high resistance. Defective power module capacitors or voltage regulation components experiencing degradation. Transient voltage sag caused by heavy electrical load on the facility grid or nearby equipment startup.

How do I fix KUKA Robot alarm KRC0345?

1. Acknowledge the alarm using the teach pendant interface and note if the alarm immediately reoccurs or persists 2. Verify main power supply voltage at the controller input terminals using a calibrated multimeter; confirm 3-phase voltage is within ±10% of nominal (typically 380-415V AC) 3. Inspect all power terminal connections at the main disconnect and power module for corrosion, loose fasteners, or damaged connectors; reseat connections firmly 4. Check the facility's electrical system for voltage instability or excessive load; coordinate with plant maintenance to measure grid voltage stability 5. Review the power module service history and examine capacitors visually for bulging, leakage, or burn marks indicating component failure requiring replacement 6. If voltage is stable and connections are secure, contact KUKA service to test or replace the power module, as internal voltage regulation circuits may be faulty

KUKA Robot codes

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KUKA Robot Controller

Power Supply · Basic

Alarm KRC0345

KUKA Robot KRC0345 - ACKN. UNDERVOLTAGE <power module> 1 1224 1225 1226 1227 1228

This alarm indicates an acknowledged undervoltage condition detected in the power module of the KUKA KRC controller, affecting one or more of the specified power supply phases or rails (1224, 1225, 1226, 1227, 1228). The controller has detected that input voltage has fallen below the minimum operating threshold and requires acknowledgment to clear the alarm condition.

KUKA RobotPower SupplyBasic

KRC0345

KUKA Robot KRC0345 - ACKN. UNDERVOLTAGE <power module> 1 1224 1225 1226 1227 1228

ACKN. UNDERVOLTAGE <power module> 1 1224 1225 1226 1227 1228

Common Causes

Unstable or insufficient main power supply voltage below 380V AC (3-phase) or 110V AC (single-phase) specification
Loose or corroded electrical connections at the main power terminals or internal power module connectors
Faulty power distribution unit, circuit breaker, or power supply cable with high resistance
Defective power module capacitors or voltage regulation components experiencing degradation
Transient voltage sag caused by heavy electrical load on the facility grid or nearby equipment startup

Troubleshooting Steps

1Acknowledge the alarm using the teach pendant interface and note if the alarm immediately reoccurs or persists
2Verify main power supply voltage at the controller input terminals using a calibrated multimeter; confirm 3-phase voltage is within ±10% of nominal (typically 380-415V AC)
3Inspect all power terminal connections at the main disconnect and power module for corrosion, loose fasteners, or damaged connectors; reseat connections firmly
4Check the facility's electrical system for voltage instability or excessive load; coordinate with plant maintenance to measure grid voltage stability
5Review the power module service history and examine capacitors visually for bulging, leakage, or burn marks indicating component failure requiring replacement
6If voltage is stable and connections are secure, contact KUKA service to test or replace the power module, as internal voltage regulation circuits may be faulty

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