MC250 page 51 of 78
MC250 Rev.02-USA (+34) 944 71 16 00 (+34) 944 53 17 54 export@alba.es www.alba.es
5.3. Troubleshooting
TROUBLE PROBABLE CAUSE SOLUTION
Hoist doesn’t run
(RED LIGHT ACTIVATED)
Emergency stop activated Check emergency stop
Safety endtrack limit switch activated Check safety microswitch
Mast detector Check mast detector
The machine moves
making an abnormal noise
or abruptly
Guide roller or bearing damaged Check/replace guide rollers
Lack of Grease in mast rack Apply Grease to the rack
Machine slides down when
loading weight
Brake wear Check/replace brake (disk, rectifier)
Brake wear Check brake airgap
Overload Check load on cage
The electric motor does not
start or starts with difficulty
Brake rectifier doesn’t work Check/replace brake rectifier
Power voltage failure Check supply voltage
The machine does not stop
at stops
Problem in endtrack cams Check endtrack cams and switches
Problem with motor brake Check motor brake
The cage vibrates
abnormally
Non tighten screws Check and adjust guide roller screws
Rack-pinion gear problem Check rack-pinion gearing
Lack of lubrication Apply Grease to rack and pinion
Roller damage Check rollers
Mast tube damage Check the mast
The reducer
sounds/vibrates
abnormally
Lack of oil in gearmotor Check oil level
Gearmotor bearing damaged Alert motor technical service
The hoist suffers stops
when moving
Communication cable damaged Check communication cable
Endtrack switch unadjusted Check the adjust of switches
The machine goes down
when we push up button
Phase error Change the phases in the motor box
E1 or E2 failure Problem in transformer Check/replace the transformer
Drive error: oPF1 Loss of a phase at the invertor output
Check the connections of the drive to the
motor
Drive error: oPF2 Motor not connected or motor power too low
Check the connections of the drive to the
motor
Drive error: obF Excessive braking or dragged load Check resistance connection
Drive error: SoF Instability or load too high Check resistance connection
Drive error: EPF1 External device fault Check motor and brake and E3
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