Alimak ALC II User Manual page 17

Retardation distances (VFC lift)
The ALC controller sets the retardation distances automatically
during system calibration drive, in the following manner:
– Push the Up and Down buttons on the car ALC CPU. The lift
accelerates to nominal speed upwards.
When the Reference / Retardation switch leaves the cam, the
ALC controller removes the high speed signal and the lift
decelerates and stops.
The lift is now located above the Reference / Retardation
cam and is still in calibration mode.
– The lift accelerates automatically upwards to high speed,
retards and stops. Speed and retardation distance, from high
to low speed in upwards direction are now stored into the
system. The lift accelerates once more automatically
downwards to high speed, retards and stops. Speed and
retardation distance, from high to low speed in downwards
direction are now stored into the system.
– The system does this procedure 3 more times to measure 2
intermediate speeds and 1 low speed with corresponding
retardation distances.
The lift will stop on the reference cam after 4 times up and
down.
Retardation distances for 4 different speeds and the door
zone are now programmed into the ALC-system. This system
calibration is normally done at the factory
If the lift is moving on crawling speed for approximately 2 to
10 cm (1 – 4 in.) before it stops, then the retardation
distance is Ok.
NOTE!
– The Reference / Retardation cam shall be located approx-
imately 1.1 x Y m above the down limit cam. (Y= the lift
speed in m/sec.). Deviations can occur. Please see the
manuals delivered with the lift.
The lift should move on crawling speed for only approx-
imately 2 to 10 cm (1 – 4 in.) when stopping at landing.
– If location of the reference cam is changed all landing levels
must be changed the corresponding way.
New system set-up and system calibration must be done if
car CPU is replaced.
Keep the Up/Down button depressed during the entire drive
sequence – if the hold to run feature is chosen.
ALIMAK 34184 - 1/05
Note! If joystick with one or two
speeds: Press and hold the joystick
up and hold the joystick the total
time for the factory calibration.
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