Ensuring safe operation
Special local conditions or special applications can lead to situations which were not known when this chapter was
written. In this case, the owner must ensure safe operation or take the machine out of service until measures for
safe operation have been clarified and implemented in agreement with Demag or other responsible bodies.
In the event of a stoppage (e.g. if defects regarding safe and reliable operation are detected, in emergency situations,
in the event of operating malfunctions, for repairs and maintenance purposes, if damage is detected or after finishing
work), the operator must carry out all prescribed safety measures or observe that they are automatically carried out.
Work on electrical equipment may only be carried out by qualified electricians.
7.2 Switching on
7.2.1 Inspections when starting work
Before starting work, the operator must be satisfied that the machine is in safe and correct operating condition.
Ensure that nobody is endangered by operation of the hoist before switching it on or putting it into operation. If the
operator notices persons who may be exposed to a risk to health or personal safety by operation of the installation,
he must stop operation immediately and may not resume operation until the persons are outside the danger zone.
In the event of defects which endanger safe and reliable operation, the chain hoist must be taken out of service
without delay. Defects relevant to safety in this sense are, for example:
● Damage to electrical devices, cables or insulation,
● Delayed functioning or failure of brakes and safety devices,
● Missing covers or housing parts or
● Damage to the chain or to supporting parts.
Anybody who identifies an immediate danger of personal injury must actuate the emergency stop without delay. This
also applies in the case of damage occurring to parts of the machine and equipment which makes immediate stop‐
page necessary.
When the chain hoist has been stopped as a consequence of safety-relevant defects by an emergency stop, it must
be secured against putting into operation again until an experienced technician is satisfied that the cause of the
hazard situation has been eliminated and that operation of the machineis possible without any hazard.
Before starting work:
● Wear protective clothing!
● Check that no persons are in the danger zone of the unit.
7.2.2 Functional tests
Instructions for users within the scope of application of the BGV D06 accident prevention regulations:
In accordance with BGV D06, the crane operator must also check functioning of the emergency stop device when
starting work. This does not apply to slipping clutches used as an emergency-stop device which need not be checked
when starting work (BGV D06, §30). DC chain hoists are fitted with a slipping clutch as an emergency-stop device
which needs not be checked by the crane operator, therefore a device for by-passing the limit switches which are
approached during normal operation is not fitted.
Before starting work the main functions of the machine must be checked:
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21480244/181209
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