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EMERGENCY STOP
Two emergency Stops are fitted. One at each control post. When depressed they must
stop all movements within a few seconds maximum. When activated it must not be
possible to operate the machine. To release, turn 1/4 turn and the Emergency stop head
will pop back out. The switch head is not physically attached to the switch mechanism
behind the head. If the head is released and the machine will not start check that the
switch has not seized in the open position.
ELECTRICAL SYSTEM
The electrical system is quite simple and requires minimal maintenance. The biggest
problem is loose connections, again caused by vibration during towing, and the second is
moisture or condensation caused by high humidity and temperature fluctuations.
Erratic running of the motor when depressing the green run button and moving the booms
can be caused by an intermittent internal cable failure. The failure can be hard to locate.
The best way is to lower the relevant boom. If the motor has stopped permanently, use
the emergency lower system. Try to raise the boom again and see it the fault occurs
roughly in the same place. If it does, it is highly likely you have an internal cable failure
and the complete cable should be replaced.
On mains powered machine the control circuit is almost identical apart from voltage
variants and the use of a isolation transformer on the control circuit. The bolt on motor
contactor used on the DC pack is replaced by a combined thermal overload and motor
contactor mounted inside its own junction box. On I.C. machines the boom circuit is the
same as for the DC powered machines apart from the electrical start stop circuit needed
for the engine.
MAINTENANCE PROCEDURE
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