axismd.ai
KUKA Robot Controller
System · Advanced
KUKA Robot KRC0581 - Brakes open during mastering selection
This alarm indicates that a brake failed to engage properly after a motion command completed during mastering or axis selection operations. The brake remains in the open state when it should have closed, preventing the robot from holding its current position and creating a safety hazard. This condition is typically detected by the controller's brake monitoring system after the axis comes to a complete stop.
KRC0581
KUKA Robot KRC0581 - Brakes open during mastering selection
Brakes open during mastering selection
This alarm indicates that a brake failed to engage properly after a motion command completed during mastering or axis selection operations. The brake remains in the open state when it should have closed, preventing the robot from holding its current position and creating a safety hazard. This condition is typically detected by the controller's brake monitoring system after the axis comes to a complete stop.
Common Causes
- Brake solenoid coil failure or loss of electrical continuity in the brake circuit
- Insufficient air pressure in the pneumatic brake system or blocked air supply line
- Brake mechanical wear or debris preventing proper brake pad engagement
- Faulty brake sensor or Hall effect switch providing incorrect feedback to the controller
- Damaged brake connector or wiring harness causing intermittent electrical connection
Troubleshooting Steps
- 1Verify the robot is in a safe position and stop all motion commands immediately to prevent drift
- 2Check the air supply pressure to the brake system and confirm it meets KUKA specifications (typically 6 bar minimum)
- 3Inspect the brake solenoid connector for corrosion, loose pins, or water ingress and reseat the connection
- 4Test brake functionality by manually actuating the brake solenoid valve while listening for an audible click and checking for brake engagement
- 5If available, use the KRC diagnostics menu to check brake sensor signals and solenoid control outputs for each affected axis
- 6Contact KUKA service if electrical testing is normal but brake mechanical failure is suspected, as brake pad replacement may be required
Seeing Multiple Alarms?
Seeing another alarm with this one? Enter the code.
Get machine-aware diagnosis
AxisMD logs alarms against your actual machines, tracks patterns, and gives AI context your manual doesn't have.
Start freeWas this guide helpful?
Always verify with your machine manual or a certified technician before performing service procedures.