Only with normal operative travel to the top hoist limiter
This section only applies if the top hoist limiter may be travelled to during normal operation.
The top hoist limiter may be intentionally triggered during the normal course of work. The top hoist limiter must be tested upon switching on the crane.
If the top hoist limiter is damaged through normal use, an additional backup limiter handles the shutdown. This backup limiter must be checked within the course of regular inspection.
Moving the load hook to the correct position
Move the load hook out of the limit switch range (up or down).
The load hook may not be within the limit switch range prior to the test.
Testing backup limiter
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‘Top’ position | |
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Toggle switch |
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Turn the toggle switch to the ‘top’ position and hold.
Slowly lift the load hook.
● The load hook moves up.
● Due to the activated toggle switch, the load hook does not stop as usual at the switching point of the top hoist limiter, it moves onwards instead.
● The backup limiter is activated.
● The main contactor switches off.
● The backup limiter has now been checked.
If the main contactor did not switch off:
● There is a problem with the crane circuitry or individual components. The crane may no longer be operated.
Shut down the crane.
Contact ABUS Service.
Switching the crane on again
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‘Bottom’ position | |
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Toggle switch |
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Turn the toggle switch to the ‘bottom’ position and hold.
● The main contactor is bridged.
● The crane switches back on.
Move the load hook out of the limit switch range.