Nidec LEROY-SOMER FFB Series, Руководство по обслуживанию

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REPAIR GUIDE
FFB Brake Motors Maintenance Guide
5287 en - 2019.07 / d
7 - REPAIR GUIDE
Incident Possible cause Remedy
Abnormal noise From motor or driven machine? Disconnect the motor from the driven device and test the motor alone
Noisy brake motor Mechanical cause: if the noise persists after powering
off
- Vibrations
Check that the key complies with the type of balancing
- Check the condition of the bearings
- Faulty bearing - Change the bearings as soon as possible
- Sensor extension (item 1401 ) fitted improperly - See adjustment § 6.6
- Mechanical friction: ventilation, coupling - Check and change the faulty part
Electrical cause: if the noise stops after power drops - Check the supply at the motor terminals
- Check the drive setting
- Normal voltage and 3 phases balanced - Check the plate connection and strip tightening
- Abnormal voltage - Check the supply line
- Unbalance of phases - Check the resistance of windings
Other possible causes:
- bad drive setting
- drive malfunction
Refer to the drive manual
Abnormal motor
heating
- Faulty ventilation - Check the environment
- Clean the ventilation cover and the cooling fins
- Check the fitting of the fan onto the shaft
- Faulty supply voltage - Check
- Strip coupling error - Check
- Overload - Check the intensity absorbed with respect to that indicated in the motor
information plate
- Partial short circuit - Check electrical continuity of the windings and/or the installation
- Phase unbalance - Check the resistance of windings
Other possible causes:
- bad drive setting
Refer to the drive manual
Motor does not start Empty:
- Mechanical blocking
- Release the brake and motor powered off:
check by hand that the shaft turns freely
- Power supply line interrupted - Check the fuses, electric protection, starting device
- Position return (drive message) - Check the wiring, drive setting, operation of the position sensor
- Thermal protection - Check
In charge:
- Unbalance of phases
Powered off:
- Check the rotation direction (order of the phases)
- Check the resistance and continuity of the windings
- Check the electric protection
- Drive - Check the setting, dimensioning (Max current delivered by the speed
drive)
- Position return (drive message) - Check the wiring, drive setting, operation of the position sensor
- Thermal protection - Check
The brake does not
release
- The voltage is present at the coil's terminals 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
- The lever rod is in abutment on the cover - See adjustment section 6.1 ref. 1406
- Mobile parts are stuck - Remove, clean, and look for the cause of sticking
- No more voltage at the coil terminals The cell is inoperative
- Test it
- Drive - Check that the brake supply is separate from the motor's
The call time is too
long
- Check the voltage at the coil terminals The voltage is too low U < 0.8Un (Un: according nominal power supply)
- Restore the voltage to its nominal value
- The air gap is too wide - Readjust
- The braking moment has increased - Return to the initial setting or consult
The drop time is too
long
- Check that the power off is performed on the direct - Connect the cell as per the mark (A) power off on the direct
The brake is noisy
when released
- Irregular or excessive air gap - Remove if necessary and clean (see §4)
- Foreign material in the air gap - Clean
- Extension shaft
1401
fitted incorrectly - See encoder reassembly section 6.6
- Drive - Check that the brake supply is separate from the motor's
The braking moment
is insufficient
- The friction faces are not clean and dry - Clean the friction faces
- Redefine the braking moment
- Pollution due to environment - Clean friction faces. If disc is marked, replace it
- The disc is worn - Change the disc
The brake is applied
(drops) but braking
is weak
- Insufficient spring pressure - Check pad wear. Increase the number of springs
- Correct spring pressure - Check the surface wear of the armature
- Use a blower to clean dust due to friction
Permanent pad
friction
- The air gap is insufficient - Adjust the air gap