What causes KUKA Robot alarm KRC0151?

Insufficient input AC mains voltage supply to the KPS unit. Faulty or degraded main power supply circuit breaker or contactor. Damaged power cables or loose electrical connections at the KPS input terminals. Defective charging circuit within the KPS module or internal voltage regulation failure. Excessive load demand during charging cycle exceeding available power capacity.

How do I fix KUKA Robot alarm KRC0151?

1. Verify that the main AC mains voltage supply meets specification (typically 3-phase 400V ±10%) using a multimeter at the KPS input terminals 2. Inspect all power supply cables and connectors for visible damage, corrosion, or loose contacts and reseat connections firmly 3. Check that the main circuit breaker and any isolation switches are fully engaged and not tripped 4. Reduce peripheral system loads and restart the charging cycle to determine if the issue is load-related 5. If voltage is confirmed adequate, reset the KPS module by cycling the main power switch off for 30 seconds then back on 6. If the alarm persists, the KPS unit likely requires replacement or service; contact KUKA support or an authorized service technician

KUKA Robot codes

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KUKA Robot Controller

Power Supply · Advanced

Alarm KRC0151

KUKA Robot KRC0151 - Undervoltage <kps number> while charging

This alarm indicates that the KPS (KUKA Power Supply) unit is detecting an undervoltage condition during the charging phase of the robot's backup battery system. The voltage has fallen below the minimum threshold required for safe charging operations, preventing proper energy storage in the system's power reserve.

KUKA RobotPower SupplyAdvanced

KRC0151

KUKA Robot KRC0151 - Undervoltage <kps number> while charging

Undervoltage <kps number> while charging

Common Causes

Insufficient input AC mains voltage supply to the KPS unit
Faulty or degraded main power supply circuit breaker or contactor
Damaged power cables or loose electrical connections at the KPS input terminals
Defective charging circuit within the KPS module or internal voltage regulation failure
Excessive load demand during charging cycle exceeding available power capacity

Troubleshooting Steps

1Verify that the main AC mains voltage supply meets specification (typically 3-phase 400V ±10%) using a multimeter at the KPS input terminals
2Inspect all power supply cables and connectors for visible damage, corrosion, or loose contacts and reseat connections firmly
3Check that the main circuit breaker and any isolation switches are fully engaged and not tripped
4Reduce peripheral system loads and restart the charging cycle to determine if the issue is load-related
5If voltage is confirmed adequate, reset the KPS module by cycling the main power switch off for 30 seconds then back on
6If the alarm persists, the KPS unit likely requires replacement or service; contact KUKA support or an authorized service technician

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