User`s manual
55
WHAT
TO
DO
IF
FUNCTION
BREAKDOWN
Hoist
lifting
Trolley
traveling
Possible cause of breakdown
•
hoist/lower limit switches
• hoisting/lowering contactor
Does not start X
• hoisting/lowering push button
• load limiter
• hoist motor
• Hoisting motor fuses
• hoist/trolley power supply cable
• power supply line
Does not start X X • low voltage transformer
• line contactor
• line fuses
• left/right limit switches
• left/right contactor
Does not start - X • left/right push button
• trolley motor
• traveling motor fuses
• limit switch, contactor or push button of the
inhibited function
starts partially
(in one direction only)
X X
(independent from one another)
• One phase loss
the movement does not finish
in the due distance
X
besides, the load
slides down
and is not held
X
• function brake
the movement does not finish
within the due limits
X X
• function brake
• function limit switches
the movement
• faulty direction push button
continues in its function
also
after releasing the relevant
push button
X X
• relevant contactor
• “false contact”
hoisting reducer
excessively
noisy
X -
• scarce lubrication
• service off cycle
trolley reducer
• clearance between wheel and girder’s flange is
too narrow
excessively
noisy
- X
• scarce lubrication
• not correct/excessively intensive service
screeching brake
screeching noise
X
• presence of dust
• excessive clearance
• worn out braking lining
during braking
X
• wrong clearance between wheel and girder's
flange
screeching wheels - X • scarce lubrication
(jerk motion)
• not correct/excessively intensive service
• worn out wire rope or drum/pulleys
screeching lifting chain and/or
sprokets
X -
• scarce lubrication
• not correct/excessively intensive service
the hoist bumps during
traveling
- X
• non correct contact between rail and wheel
• non aligned joints of sliding beam
the hoist and/or trolley move
slowly or the hoist
has difficulty lifting the load
X X
• voltage drop
• overloading (in the absence of the load limiter)
• beginning of reducer seizing
• non correct contact between rail and wheel
electric current in the hook X - • faulty or damaged wiring
the trolley skids on the rails
and does not travel
-
X
-
• clearance between wheel and girder’s flange is
too narrow
• obstacle on the girder’s flange
• oil and grease on the girder's flange