T61827
Revision:
19
MAESTRO
For software versions ending on 64 and higher:
Switch off lift.
Get both carriages to bottom position and in balance. Is this already done, wait 30 sec.
Switch on lift. Both bottom sensors must now be alight.
The lift should now work and the trouble shooting can be continued.
When replacing a circuit board the document T81701 ”Return note for circuit boards” has to be
filled out and packed with the defective circuit board to be returned to the sub-supplier.
SUPERVISION OF SENSORS / MOTOR STARTER
Check during raising and lowering that the distance between pulses does not exceed a preset time. If one
of the three magnets in the V-belt pulley is missing, or a sensor is defective or if for one reason or another
the scanning is not correct the time will be exceeded and the lift will stop.
Also a big drop in speed of the motor (number of revolutions), for instance because of a missing phase, will
make the lift stop.
To make the motor reach full speed it has been allowed that the above requirements to pulses should not
be fulfilled during the first approx. ½ second after start of each motor. In practice this means that one of the
above errors will be registrered within less than one second.
PRECAUTIONS CONCERNING MANUAL OPERATION OF THE LIFT
Always disconnect the power supply to the control unit before turning the V-belt pulleys of the spindles
manually. Before reconnecting the control unit check that the carriages are placed above and in front of the
bottom position sensors and that they are in the same height. This can be checked by observing that the
indicator lamps on top of the posts.
During the first run after start a possible small unbalance will be equalized when the lift reaches bottom
position. A bigger unbalance will make the lift stop when the first carriage reaches bottom position and it is
then necessary to turn off/turn on the lift again to be allowed to run the second carriage down to bottom
position – perhaps several times depending on the initial difference in height.
