In the event of a power failure, a defective hoist motor or a defective brake coil, the load can be lowered by hand. To do so, the brake is released manually using the brake release lever.
Lowering a load by hand is an emergency measure.
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Danger due to uncontrolled sagging of the load! The load accelerates quickly if the brake is released too far. This could cause the load to sag in an uncontrolled fashion. Warn persons around the crane about the emergency lowering procedure. Activate the brake release lever very carefully. |
Cordon off the operating range
around the crane sufficiently.
Inform persons around the crane
about the emergency lowering procedure.
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Danger from electric shock! Even after the crane has been switched off, life-threatening high voltages are present in the frequency converter and hoist drive. Before working on the hoist drive, detach the connection cable of the hoist drive. |
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Do not allow the fan cover to hang from the connection cable! If the fan cover with auxiliary fan hangs on the connection cable, it can break, since the fan cover with auxiliary fan is very heavy. Detach the plug-in connection in the connector housing and pull out the connection cable so that you can lay the fan cover aside during the assembly. |
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Auxiliary fan connector |
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Cable bushing |
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Disconnect the auxiliary fan
connector.
Pull the connection cable of the
auxiliary fan out of the cable bushing.
The cable bushing is slotted in from above. This makes it easy to pull the connection cable out.
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Fan cover |
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Rib screws M6x10 |
Unscrew the rib screws M6x10 of
the fan cover.
Pull the fan cover off to the
rear.
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Brake release lever |
Threaded rod |
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Screw a threaded rod M16 into
the brake release lever.
Carefully and slowly tilt the
brake release lever backwards with the threaded rod.
● The brake is released, the load sinks downwards.
Tilt the brake release lever
back if the load is losing height too quickly.
The brake lining is subject to a heavy load during emergency lowering and can quickly overheat. Therefore, the brake rotor must be replaced afterwards. See Replacing the brake rotor on the hoist drive.
