Kendrion 7760016A00-0004, Руководство пользователя

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Operating Instructions BA 77 600..A00 // Last updated: 13/03/2020 // Page 23 of 33
6.2 Heat
Braking operations and gradual heating of the field coil cause the solenoid housing temperature to increase
substantially. Under adverse conditions, the surface temperature may rise to well over 60°C.
Caution!
Risk of burns in case of contact with hot surfaces! Suitable covers and hand guards must be installed to provide
protection against accidental contact.
7. Troubleshooting
Fault Cause Corrective actions
Brake release
failure
• Air gap too large
Check the air gap. Install a new friction disc, if
necessary.
• No voltage applied to brake
Check the electrical connection and correct faults, if
found.
•
Voltage applied to field coil too low
Check the field coil supply voltage and correct faults, if
found.
• Armature plate blocked
mechanically
Eliminate mechanical blocks.
•
Damaged rectifier Check the rectifier and replace it, if necessary.
• Damaged field coil
Check the field coil resistance. Install a new brake, if
necessary.
• Friction disc thermally overloaded
Install a new friction disc. Install a new brake, if
necessary.
Delayed brake
release
• Air gap too large
Check the air gap. Install a new friction disc, if
necessary.
•
Voltage applied to field coil too low
Check the field coil supply voltage and correct faults, if
found.
Brake engagement
failure
• Voltage applied to field coil in
unpowered condition too high
(residual voltage)
Check whether residual voltage is applied to the field
coil and correct faults, if found.
•
Armature plate blocked
mechanically
Eliminate mechanical blocks.
Delayed brake
engagement
•
Voltage applied to field coil too high Check the field coil supply voltage and correct faults, if
found.
Brake torque too
low
• Air gap too large
Check the air gap. Install a new friction disc, if
necessary.
• Oily or greasy friction surface
Check the friction surface. Install a new friction disc, if
necessary.
•
Axial armature movement blocked
by hand release
Check the air gap. Install a new friction disc, if
necessary.
•
Broken compression spring
Check the spring force. Install a new brake, if
necessary.
Microswitch failure
(only brake types
with microswitch)
• Damaged microswitch
Install a new microswitch.
• Adjustment error of microswitch
switching point
Readjust the microswitch switching point.
Table 23/1: Possible faults, causes and corrective actions (list not exhaustive)