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Position Control
The actual slow down distance can be learned by the drive or it can be
entered manually. However, it is recommended that the drive actually learn
the distance as this will also take into account the internal delays of the
controller. These delays will actually result in a lower value for the slowdown
distance than that actually measured with a tape measure.
First verify that the value in LP.2 is at least 6-8 inches lower than the actual
slowdown distance as measured in the hoist-way with a tape measure. This
distance reduction accounts for the delay in the controller. If LP.2 is too high ,
adjust the pro le in parameters 0.LF.53, 0.LF.54, 0.LF.55 to achieve a lower
value. Note: after changing the pro le parameters, LP.2 will automatically
re-calculate.
Now it is possible to learn the slow down distance.
1) Move the car on inspection to a oor in the middle of the hoist-way.
2) Adjust LP.1 = tEAch.
3) Set the display of the drive to LP.12 to view the position in inches.
4) Place a call up or down for a High Speed (if necessary, multi- oor) run.
5) As the car begins to accelerate, the position value will begin to count up
or down. Then at the moment the slowdown is crossed, the position value
will reset to zero and begin measuring the slowdown distance.
6) Once the car comes to a stop and the drive is disabled, the drive will
note the actual position, subtract one inch and then load the value into
parameter LP.3. It will also store the same value minus two additional
inches in LP.4. As a con rmation the display will show tdone. At this point
the distance has been learned.
7) To verify distance, set LP.1 = P onE. Change the display to LF.99.
8) Place a call up or down for a 1 oor run. The display should show the
following sequence: noP, boFF, Fcon or rcon, PA (while the car runs to
the oor all the way down to leveling speed), Fdec or rdec, rcon, bon LS,
nop. The positioning is functioning normally. Now the distance in LP.4
can be manually adjusted to minimize the leveling distance. Additionally
the pro le can be further adjusted if needed for ride comfort. Repeat the
process for a multi- oor run adjusting LP.3 to adjust the leveling distance
in this case.
9) If the unit displays PnA and the car under- or overshoots the oor, the
position is not accessible. Increase the rate of deceleration in 0.LF.54
and 0.LF.55 and then re-learn the position. If this still does not resolve
the problem, it may be necessary to move the slowdown point further
away from the oor.
Learning the slow down distance
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