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KUKA Robot Controller
Overtravel/Limit · Advanced
KUKA Robot KRC0074 - HARDWARE LIMIT SWITCH / +24V MISSING
This alarm indicates that a hardware limit switch has been activated or that the +24V power supply to the limit switch circuit is missing or insufficient. The limit switch serves as a safety mechanism to prevent the robot from moving beyond its mechanical travel boundaries, and loss of +24V power prevents proper monitoring of these safety-critical switches.
KRC0074
KUKA Robot KRC0074 - HARDWARE LIMIT SWITCH / +24V MISSING
HARDWARE LIMIT SWITCH / +24V MISSING
This alarm indicates that a hardware limit switch has been activated or that the +24V power supply to the limit switch circuit is missing or insufficient. The limit switch serves as a safety mechanism to prevent the robot from moving beyond its mechanical travel boundaries, and loss of +24V power prevents proper monitoring of these safety-critical switches.
Common Causes
- Robot has moved to or beyond mechanical end-of-travel position, triggering the physical limit switch
- Broken or disconnected wiring between limit switch and KRC controller input module
- Faulty limit switch component requiring replacement
- +24V power supply to the I/O module is interrupted, degraded, or not properly distributed
- Loose terminal connections or corrosion on limit switch circuit connectors in the control cabinet
Troubleshooting Steps
- 1Verify physical robot position and manually check if any axis has reached mechanical hard stop; if so, move robot away from limit using jog mode with appropriate caution
- 2Inspect the +24V power supply voltage at the I/O module using a multimeter; ensure voltage is between 24V +/- 5% (19.2-28.8V)
- 3Check all wiring connections between limit switches and the KRC controller input terminals for loose pins, corrosion, or damage
- 4Test limit switch continuity using a multimeter in both closed and open positions to confirm the switch is functioning mechanically
- 5Verify signal wiring integrity by disconnecting and reconnecting all limit switch connectors at both the robot and controller end, ensuring firm seating
- 6If alarm persists, replace the suspected faulty limit switch or check the input module for hardware failure; contact KUKA service if +24V supply is confirmed absent
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