What causes KUKA Robot alarm KRC0004?

Battery age exceeding manufacturer lifespan, typically 5-7 years of normal operation. Defective battery cell or internal battery failure causing inability to hold charge. Prolonged power loss or multiple power cycling events that have depleted battery reserves. Excessive backup power drain from controller memory retention during extended idle periods. Faulty battery charging circuit in the power supply module preventing proper recharge cycles.

How do I fix KUKA Robot alarm KRC0004?

1. Verify main power supply voltage is stable at the KRC4 controller input and check for loose power connections 2. Allow the controller to run under main power for 24 hours to attempt battery recharge through the charging circuit 3. Access the System Information in the KUKA smartPAD to confirm actual battery voltage reading and compare to specification sheet 4. Inspect the backup battery connector inside the controller enclosure for corrosion or loose connections and clean if needed 5. Replace the backup battery with an OEM KUKA replacement part if voltage does not recover after extended charging 6. If replacement does not resolve the alarm, the charging circuit may be faulty and the power supply module should be replaced by authorized KUKA service

KUKA Robot codes

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KUKA Robot Controller

Power Supply · Intermediate

Alarm KRC0004

KUKA Robot KRC0004 - Buffer Battery Voltage Low

The backup battery voltage in the KRC4 controller has fallen below the minimum operating threshold required to maintain system integrity during power loss events. The robot stops all motion as a safety precaution to prevent data corruption and unexpected behavior if main power fails during operation.

KUKA RobotPower SupplyIntermediate

KRC0004

KUKA Robot KRC0004 - Buffer Battery Voltage Low

Buffer Battery Voltage Low

Common Causes

Battery age exceeding manufacturer lifespan, typically 5-7 years of normal operation
Defective battery cell or internal battery failure causing inability to hold charge
Prolonged power loss or multiple power cycling events that have depleted battery reserves
Excessive backup power drain from controller memory retention during extended idle periods
Faulty battery charging circuit in the power supply module preventing proper recharge cycles

Troubleshooting Steps

1Verify main power supply voltage is stable at the KRC4 controller input and check for loose power connections
2Allow the controller to run under main power for 24 hours to attempt battery recharge through the charging circuit
3Access the System Information in the KUKA smartPAD to confirm actual battery voltage reading and compare to specification sheet
4Inspect the backup battery connector inside the controller enclosure for corrosion or loose connections and clean if needed
5Replace the backup battery with an OEM KUKA replacement part if voltage does not recover after extended charging
6If replacement does not resolve the alarm, the charging circuit may be faulty and the power supply module should be replaced by authorized KUKA service

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