Rack and pinion hoist
Assembly and Operating Instructions
84 / 100 BL108 GB Edition 03.2018 Rev. 02
9.1.1 Motor is not producing full output
− Voltage drop of more than 10% of the rated voltage.
− Select a supply cable with a larger cross-section.
− If overloaded, the integrated thermal switch turns off the control
current. Work can continue after a certain cool-down period (possibly
reduce load).
Refrain from repeated overheating/overloading. -Otherwise the
service life of the motor/brakes will be shortened.
9.1.2 Load platform moved too high
The drive pinions can reach the upper end of the ladder if:
− the top (last) ladder interlock is closed.
− the UP limit switch is defective.
− there is a malfunction in the electrical system.
Action:
Press the DOWN button (manual control).
Load platform moves downwards.
If it is not possible to lower the platform under control, it must be
lowered approximately 20 cm by carefully releasing the brake
(using a pull-cable on the brake release lever from the ground).
Check the top ladder lock (must be open)
If the last ladder lock was open, shut down the hoist and secure. – Have
it checked immediately by a qualified electrician!
9.1.3 Platform has descended too low
Cause
The platform can overrun the lower limit switch, if
− Brake air gap is too large,
− The DOWN limit switch is defective,
− there is a fault in the electrical system,
− The load platform is overloaded,
− The platform has been lowered with the manual brake release.
Action:
Press the button UP (manual control).
Load platform moves upwards.
If this effect occurs repeatedly, although the platform is not
overloaded, have the brakes checked and adjusted as necessary
by a qualified person.
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