ABB IRC5 Operating Manual page 60

3 Troubleshooting by fault symptoms
3.14 Problem releasing Robot brakes
Continued
Recommended actions
This section details how to proceed when the robot brakes do not release.
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Action
Make sure the brake contactor is activated.
Make sure the RUN contactors (K42 and K43) are
activated. NOTE that both contactors must be
activated, not just one!
Use the push buttons on the robot to test the
brakes.
If just one of the brakes malfunctions, the brake
at hand is probably faulty and must be replaced.
If none of the brakes work, there is probably no
24V BRAKE power available.
Check the power supply to make sure 24V BRAKE
voltage is OK.
A number of other faults within the system can
cause the brakes to remain activated. In such
cases, event log messages will provide additional
information.
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Information
A 'tick' should be audible, or you
may measure the resistance across
the auxiliary contacts on top of the
contactor.
A 'tick' should be audible, or you
may measure the resistance across
the auxiliary contacts on top of the
contactor.
The location of the push buttons
differ, depending on robot model.
Please refer to the product manual
for the robot!
The event log messages can also
be accessed using RobotStudio.
Operating manual - Troubleshooting IRC5
3HAC020738-001 Revision: AA