User`s manual

56
BREAKDOWN OF COMPONENTS AND POSSIBLE REMEDIES
Causes of poor functioning of single parts and possible remedies
Type of breakdown Possible causes of breakdown Possible remedy
the wire rope ascends “jerkily” and
screeches
• breakdown of the lifting chain and/or sprokets
• replace the lifting chain and, if necessary, the
sprokets
• scarce lubrication • lubricate the lifting chain , and the sprokets
• wear and tear of the braking lining • adjust the clearance or replace the lining
brake skidding • presence of oil/grease • clean the lining
• non correct service • restore the correct working conditions
Overheating brake • wrong adjustment
•
it works in unsuitable environmental conditions
• adjust the brake
• lack of power supply • restore voltage values
the brake does not unlock • wrong adjustment • adjust the brake
the brake tends to “stick”
•
it works in unsuitable environmental conditions
o off service condition
• restore adequate conditions
the limit switch is locked open
won’t restore
• clogged activating head
• incorrect correspondence
• interrupted connections
• clean it and restore right conditions
the control panel push buttons are
locked “closed”
• clogged push button control panel
• cleaning
• check conductors
contactors have “glued”
contacts
• use in unsuitable environmental conditions or
for not intended service
• restore right use conditions
• voltage fluctuations are > 10%
• poor cooling • provide the right voltage
the motor is too hot
• environmental temperature > to the one
expected
• restore the correct air circulation
• the hoist usage does not conform to the
service condition
adapt the motor’s characteristics
provided for
•
adapt the service conditions to the ones provided
for
• blown fuses or not adjusted thermal • replace the fuse and/or adjust the thermal
• the contactor interrupted the power supply • check the function’s contactor
the motor does not start • overloading, blocking due to high starting
frequencies,
• rewind the motor and guarantee a better
protection
insufficient protection • check the switchgear
• upon starting, the voltage or the frequency
become lower
• improve the power supply line or network
conditions
the motor has difficulties starting
than their nominal values
• faulty winding, the rotor touches the stator
• have a qualified technician making the repair
• the power supply lacks one phase • check the power supply and/or the contactor
the motor buzzes and absorbs
too much current
• the motor reducer is blocked
• the brake is blocked
• request a qualified technician’s intervention
• check and, if necessary, adjust the brake
• short circuit in the power supply cables
• short circuit in the motor
• eliminate the short circuit
• request a qualified technician’s intervention
short circuit in the motor’s winding
• falty winding • rewind the motor
false contact • accidental activation of the function • check push button control panel conductors