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Installation
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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.
