Adjusting Leveling And Final Stop; Final Approach And Leveling; Final Stop - MCi iControl User Manual

Final Adjustment

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 the stops are consistent.

Final Stop

There are many items to consider in establishing 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.
• Brake Release Time - The TORQMAX drive has an adjustable parameter (LF.70 Speed
Pick Delay) that determines how long the drive will keep current flowing to the motor
when the car reaches zero speed and the direction input is removed. This allows the motor
to hold the load while the brake engages. The normal setting for LF.70 is 0.300 second,
but it should always be kept below 0.800 second.
4-26 Manual # 42-02-2222