What causes KUKA Robot alarm KRC0147?

Defective or worn-out power relay K1 with stuck contacts or internal mechanical failure. Loose or corroded electrical connections on the K1 relay terminals or connector pins. Faulty relay driver circuit on the main control board or power supply module. Short circuit or ground fault in the K1 relay circuit wiring or associated control electronics. Voltage supply anomaly or brown-out condition preventing proper relay coil energization.

How do I fix KUKA Robot alarm KRC0147?

1. Power down the robot controller completely and wait 30 seconds, then attempt to restart and observe if alarm clears or persists 2. Visually inspect the K1 relay on the power supply module or main board for physical damage, discoloration, or loose solder connections 3. Check and re-seat all electrical connectors associated with the K1 relay circuit to ensure proper contact and eliminate corrosion 4. Measure the input voltage to the K1 relay coil using a multimeter to verify adequate supply voltage (typically 24VDC) is present 5. Use diagnostic software or the KRC controller's integrated diagnostics to check relay test functions and measure K1 contact states during power-up sequence 6. If voltage and connections are confirmed good, replace the K1 relay module with an OEM KUKA replacement part and verify alarm clears after restart

KUKA Robot codes

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KUKA Robot Controller

Power Supply · Advanced

Alarm KRC0147

KUKA Robot KRC0147 - Error Power Relay K1

KRC0147 indicates a fault in the main power relay K1 circuit of the KUKA KRC controller, which controls the enabling and disabling of the robot's servo drives and motor power. This alarm occurs when the controller detects an abnormal state in the K1 relay during power-on sequence or runtime operation, preventing proper motor enablement. The relay may be stuck, damaged, or experiencing electrical contact issues that prevent safe robot operation.

KUKA RobotPower SupplyAdvanced

KRC0147

KUKA Robot KRC0147 - Error Power Relay K1

Error Power Relay K1

Common Causes

Defective or worn-out power relay K1 with stuck contacts or internal mechanical failure
Loose or corroded electrical connections on the K1 relay terminals or connector pins
Faulty relay driver circuit on the main control board or power supply module
Short circuit or ground fault in the K1 relay circuit wiring or associated control electronics
Voltage supply anomaly or brown-out condition preventing proper relay coil energization

Troubleshooting Steps

1Power down the robot controller completely and wait 30 seconds, then attempt to restart and observe if alarm clears or persists
2Visually inspect the K1 relay on the power supply module or main board for physical damage, discoloration, or loose solder connections
3Check and re-seat all electrical connectors associated with the K1 relay circuit to ensure proper contact and eliminate corrosion
4Measure the input voltage to the K1 relay coil using a multimeter to verify adequate supply voltage (typically 24VDC) is present
5Use diagnostic software or the KRC controller's integrated diagnostics to check relay test functions and measure K1 contact states during power-up sequence
6If voltage and connections are confirmed good, replace the K1 relay module with an OEM KUKA replacement part and verify alarm clears after restart

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