Malfunctions – diagnosis – repair
300 Z/ZP 2
92
BL144 GB 2019-11
5.3
Rectify fault
5.3.1
Motor is not delivering full power
•
Voltage drop of more than 10% of the rated voltage.
•
Select cable with larger cross-section.
•
The integrated thermal switches turn off the control current when
overloaded. Work can continue after a certain cooling down period
(possibly reduce load).
CAUTION
Motor overload from overloading the machine
The motor heats up and the motor/brake service life is reduced.
5.3.2
Platform has travelled too high
The platform travels too high, i.e. the EMERGENCY limit switch of the
platform reaches the
UP-END
stop rail.
Possible causes:
•
the
UP
limit switch is defective
•
there is a malfunction in the electrical system
Action:
•
Bleed the motor brake using the brake release lever (see chapter
5.3.3
Platform moved too low
The platform moves too low, i.e. the
EMERGENCY
limit switch of the
platform reaches the lower
EMERGENCY STOP
stop rail.
Possible causes:
•
brake clearance is too large
•
the
DOWN
limit switch is defective
•
there is a malfunction in the electrical system
•
the platform is overloaded
•
the platform was lowered with the manual brake release
Action:
•
The platform has to be moved back to the operating range of the
mast (clearance run).