Repairing Guide - Emerson Leroy-Somer FFB Series Maintenance Manual

7 - REPAIR GUIDE
Incident Possible cause
Abnormal noise From motor or driven machine?
Noisy brake motor Mechanical cause: if the noise persists after powering off
- Vibrations
- Faulty bearing
- Mechanical friction: ventilation, coupling
Electrical cause: if the noise stops after power drops
- Normal voltage and 3 phases balanced
- Abnormal voltage
- Unbalance of phases
Other possible causes:
- bad drive setting
- drive malfunction
Abnormal motor - Faulty ventilation
heating
- Faulty supply voltage
- Strip coupling error
- Overload
- Partial short circuit
- Phase unbalance
Other possible causes:
- bad drive setting
Motor does not start Empty:
- Mechanical blocking
- Power supply line interrupted
- Position return (drive message)
- Thermal protection
In charge:
- Unbalance of phases
- Drive
- Position return (drive message)
- Thermal protection
The brake does not - The voltage is present at the coil's terminals
release
- The lever rod is in abutment on the cover
- Mobile parts are stuck
- No more voltage at the coil terminals
- Drive
The call time is too - Check the voltage at the coil terminals
long
- The air gap is too wide
- The braking moment has increased
The drop time is too - Check that the power off is performed on the direct
long
The brake is noisy - Irregular or excessive air gap
when released
- Foreign material in the air gap
- Extension shaft 1401 fitted incorrectly
- Drive
The braking moment - The friction faces are not clean and dry
is insufficient
- Pollution due to environment
- The disc is worn
The brake is applied
- Insufficient spring pressure
(drops) but braking
- Correct spring pressure
is weak
Permanent pad - The air gap is insufficient
friction
FFB Brake Motors Maintenance Guide
5287 en - 2015.04 / a
REPAIR GUIDE
Remedy
Disconnect the motor from the driven device and test the motor alone
Check that the key complies with the type of balancing
- Check the condition of the bearings
- Change the bearings as soon as possible
- Check and change the faulty part
- Check the supply at the motor terminals
- Check the drive setting
- Check the plate connection and strip tightening
- Check the supply line
- Check the resistance of windings
Refer to the drive manual
- Check the environment
- Clean the ventilation cover and the cooling fins
- Check the fitting of the fan onto the shaft
- Check
- Check
- Check the intensity absorbed with respect to that indicated in the motor
information plate
- Check electrical continuity of the windings and/or the installation
- Check the resistance of windings
Refer to the drive manual
- Release the brake and motor powered off:
check by hand that the shaft turns freely
- Check the fuses, electric protection, starting device
- Check the wiring, drive setting, operation of the position sensor
- Check
Powered off:
- Check the rotation direction (order of the phases)
- Check the resistance and continuity of the windings
- Check the electric protection
- Check the setting, dimensioning (Max current delivered by the speed
drive)
- Check the wiring, drive setting, operation of the position sensor
- Check
The air gap is too big, the yoke does not attract the armature
- Adjust and check disc wear
The voltage is too low U < 0.8Un
- Restore the voltage to its nominal value
The coil is off, its resistance is infinite
- Change the complete brake unit or the coil
- See adjustment section 6.1 ref.1406
- Remove, clean, and look for the cause of sticking
The cell is inoperative
- Test it
- Check that the brake supply is separate from the motor's
The voltage is too low U < 0.8Un (Un: according nominal power supply)
- Restore the voltage to its nominal value
- Readjust
- Return to the initial setting or consult
- Connect the cell as per the mark (A) power off on the direct
- Remove if necessary and clean (see §4)
- Clean
- See encoder reassembly section 6.5
- Check that the brake supply is separate from the motor's
- Clean the friction faces
- Redefine the braking moment
- Clean friction faces. If disc is marked, replace it
- Change the disc
- Check pad wear. Increase the number of springs
- Check the surface wear of the armature
- Use a blower to clean dust due to friction
- Adjust the air gap
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