Troubleshooting - Kendrion EEX Series Operating Instructions Manual

7. Troubleshooting

Fault
•
•
•
Brake release failure
•
•
•
•
•
Delayed brake
release
•
•
Brake engagement
failure
•
Delayed brake
•
engagement
•
Machine (e.g. motor)
start-up failure
•
•
•
Brake torque too low
•
•
Table 24/1: Possible faults, causes and corrective actions (list not exhaustive)
Cause
Air gap too large
No voltage applied to brake
Voltage applied to field coil too
low
Armature plate blocked
mechanically
Damaged rectifier
Damaged field coil
Friction disc thermally overloaded
Air gap too large
Voltage applied to field coil too
low
Voltage applied to field coil in
unpowered condition too high
(residual voltage)
Armature plate blocked
mechanically
Voltage applied to field coil too
high
Microswitch adjustment error (only
brake types with microswitch)
Damaged microswitch (only brake
types with microswitch)
Air gap too large
Axial armature movement blocked
by hand release
Oily or greasy friction surfaces
Broken compression spring
Operating Instructions BA 76..G..B00 // Last updated: 13/03/2020 // Page 24 of 34
Corrective actions
Check the air gap. Install a new friction disc, if
necessary.
Check the electrical connection and correct faults, if
found.
Check the field coil supply voltage and correct faults, if
found.
Eliminate mechanical blocks.
Check the rectifier and replace it, if necessary.
Check the resistance of the field coil. Install a new
brake, if necessary.
Install a new friction disc or a new brake, if necessary.
Check the air gap. Install a new friction disc, if
necessary.
Check the field coil supply voltage and correct faults, if
found.
Check whether residual voltage is applied to the field
coil and correct faults, if found.
Eliminate mechanical blocks.
Check the field coil supply voltage and correct faults, if
found.
Check the microswitch switching behaviour and adjust
the switch, if necessary.
Check the microswitch and replace it, if necessary.
Check the air gap. Install a new friction disc, if
necessary.
Check the air gap. Install a new friction disc, if
necessary.
Air gap too large
Check the spring force. Install a new brake, if
necessary.