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5.
INSTRUCTIONS FOR FAULT-FINDING
5.1. PROBLEMS RELATED TO POWER SUPPLY AND START-UP
FAULT
REMEDY
1. No voltage supply to the control centre
No voltage supply to the timer card.
Main battery fuse F1 has blown. Replace the
fuse.
Main switch is switched off. Switch on the main
switch.
Timer card cannot be activated.
Check the fuse F6.
Check that the key-switch is in position 1.
No voltage supply through the timer card.
Check the fuse F2 on the timer card.
2. The electric motor does not start
Key-switch is in the wrong position.
Turn the key-switch to the desired operating
location.
Emergency stop button has jammed in the lower
position.
Pull up the button and re-start the engine by
actuating any of the control movements.
Fuse F3 has blown.
Replace the fuse (10A).
No mains supply (230 VAC) to the voltmeter.
Check the fault current switch, extension cords,
possible distribution boards and fuses.
Fault current safety switch has tripped.
Reset the fault current safety switch.
Either of the telescope chain limit switches RK7
or RK15 has cut off the contactor circuit.
Check the operation of the limit switches and
readjust according to the instructions.
The safety relay SR4 is not automatically reset
With reference to the electric diagrams, check the
operation of the safety relay.
Check, whether the fault is in the electric system or in the hydraulic system.
