4.9.3 Protection of equipment
Protective devices include:
• Devices for overcurrent protection (fuses, circuit breakers)
• Motor protection devices
• Overload safety devices
• Temperature monitors
• Limit switches
The protective devices in the electrical equipment installed in the scope of supply must in
no case be removed, replaced by different devices or bridged.
If a protective device has reacted, the hoist must not be put back in service until the
cause has been determined and eliminated with the assistance of a qualified person.
Overcurrent protection devices
Every hoist must have devices for disconnecting and switching the power supply. This
function is performed by the following devices:
4.9.4 Emergency stop
It must be possible to disconnect the system electrically from the operating position. This
function can be provided by:
• Emergency stop button in the control pendant in conjunction with the crane switch
contactor
• Main isolator.
4.9.5 Runway conductor disconnecting means
• must disconnect the wire rope hoist on all poles,
• must be lockable in OFF position,
• must be installed in an easily accessible place in the system,
• must be marked as such to avoid mistakes.
4.9.6 Disconnect switch
Required for one or more hoists,
• must be lockable in OFF position.
4.9.7 Connection fuses
• Overcurrent protection devices.
• The fuse values must be observed so that the crane switch contacts do not weld if
there is a short circuit and overload protection of lead is ensured.
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