Technical manual August 2009
Rev: 01/08/09
Page:
7
Electrical Systems
3.
If the batteries and circuit boards appear in order, no air leak is found and no fault is
found with the wiring
•
Proceed to check that the lift and traversing motors are functioning by removing the
motor and battery leads and running jumper cables from the motor leads to the battery
leads. (Reversing polarity causes the motors run in reverse)
4.
If the batteries and circuit boards appear in order, no air leak is found and no fault is
found with the wiring or with the motors
•
The most likely cause of failure is a blown fuse on the circuit board. To confirm, check
the fuses on the board and verify they are both operable. If a fuse is blown replace it
with another 15 amp fuse and test the hoist. Under no circumstances should a fuse
with a fuse rating other than 15 amps be used. Using such a fuse can result in damage
to the hoist and /or personal injury. If the problem persists after testing, replace the
circuit board. If the problem still persists contact customer service on 01745 536780.
•
The other likely cause of failure is a circuit board failure that is not readily visible. To
confirm, connect the non-functioning hoist to a board from service parts or from another
hoist. (There is no need for a complete board installation: the replacement board used
for confirmation can be hooked up provisionally outside the hoist.)
5.
If the on/off buttons (and/or emergency lowering buttons) on both the hand control
and the hoist do not work
•
Check the Emergency Shut-Off with Pull Cord. If it has been activated during an
emergency, call customer service. If it has been activated accidentally push the button
towards the hoist until you hear a click. This will allow you to operate the hoist again. If
the hoist still fails to operate examine the Emergency Shut-Off assembly to make sure
it is not obstructed and activates and deactivates the switch, repair as required. If the
problem persists, replace the Emergency Shut-Off switch.
