Problem Releasing Robot Brakes - ABB IRC5 Operating Manual

3.14 Problem releasing Robot brakes

Description
When starting robot operation or jogging the robot, the internal robot brakes must
release in order to allow movements.
Consequences
If the brakes do not release, no robot movement is possible, and a number of error
log messages can occur.
Possible causes
The symptom can be caused by (the causes are listed in order of probability):
en1000000051
Operating manual - Troubleshooting IRC5
3HAC020738-001 Revision: AA
• Brake contactor (K44) does not work correctly.
• The system does not go to status Motors ON correctly.
• Faulty brake on the robot axis.
• Supply voltage 24V BRAKE missing.
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3 Troubleshooting by fault symptoms
3.14 Problem releasing Robot brakes
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