Adjusting Leveling and Final Stop
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iControl DC
Adjusting Leveling and Final Stop
This section describes adjusting leveling into the floor and bringing the car to a final stop.
Final Approach and Leveling
Observe elevator operation by watching the hoist motor and observing car response on iBox test
point STP1 to GND (with the Virtual Oscilloscope Test point 1 parameter = Speed Feedback).
• If tracking accuracy is very good, increase Leveling speed and decrease Leveling distance
to reduce floor-to-floor time. You can also increase the value of Approach jerk, Decelera-
tion, and Flare jerk.
• If tracking is not perfect, begin to reduce Deceleration, Approach jerk, and Flare jerk
parameters to mold the shape of the last few inches of approach. Some experimentation
will be necessary in order to see the effect of changing parameter values. A digital storage
oscilloscope is essential.
• The goal is for the speed pattern shape to flare out and blend the deceleration into the lev-
eling speed. It is possible to modify the pattern to obtain a lot of stabilized leveling or to
decelerate the elevator all the way into the floor to obtain the best brake-to-brake times. It
is here that most of the performance and perceived ride quality is determined. Try the full
load range to be sure stops are consistent.
Final Stop
There are many items to consider for a smooth and accurate stop. Each contributes to the final
result:
• Brake drop delay - First adjust Brake drop delay on the Configuration > Brake > Con-
trol tab to provide too much delay in dropping the brake so you can clearly see the com-
plete electrical stopping characteristics of the hoist motor. Keep these characteristics in
mind as adjustments are made. It may be necessary to change Brake drop delay more than
once to clearly see the results. It is most important to never drop the brake on a moving
motor.
• Normal rate limited stop - Adjusting Normal rate limited stop (Configuration > Drive
> General tab) will also determine how harshly the stop is felt (higher values yield harsher
stops). Lower values may require a larger dead zone. To prevent the car from pulling
through under the brake, do NOT set this parameter to 0.0.
• Voltage decay time - Adjusting Voltage decay time (Configuration > Brake > Voltages
tab) determines how softly the brake drops (higher values yield softer drop). If Voltage
decay time is set too high, there will be loss of control during the time between the drive
“disconnecting” and the brake setting firmly.
• Leveling Speed - If this speed is too high, a quick transition to zero speed will occur. This
results in a bump at the stop or possible overshoot at the floor resulting in a releveling
operation. If the leveling speed is too slow, the car will stop very close to the edge of the
dead zone, which will cause the system to relevel frequently. Reasonable values of Leveling
speed (Configuration > Pattern > Common tab) range from 3 to 6 fpm. Before setting the
Dead zone distance, the selection of Leveling speed must be completed so that you are sat-
isfied with the complete final approach to the floor. If overshoot occurs frequently, adjust
Dead zone distance.
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