4-7
Reaching Contract Speed
iControl AC
4
Pattern Scaling
1. Using Pattern scaling on the
Configuration > Pattern >
Common tab, increase con-
tract speed in 10% increments
until the car is running at
80% of contract speed. Moni-
tor performance on the iView
Virtual Oscilloscope. Set:
• Test point 1 to Pattern Command (8V equals contract speed at 100% scaling)
• Test point 2 to Speed Feedback (8V equals contract speed at 100% scaling)
2. Check for severe overshoot by monitoring Speed/Actual
on the Operational Status tab. Excessive overshoot can
trip the governor. If severe overshoot does not occur, con-
tinue to increase car speed in 10% increments by increas-
ing Pattern scaling incrementally up to a maximum of
100%. Verify that car speed is peaking at no more than 3%
over contract speed (10 fpm @ 350 fpm, 15 fpm @ 500
fpm, etc.).
3. If overshoot occurs, reducing Standard/Low roll jerk (Configuration > Pattern > Modes
tab) may help, however, a Safety A (or B) Contract Overspeed Fault will occur if Stan-
dard/Low roll jerk is reduced too much. Increasing the following TORQMAX drive
parameters will help to reduce overshoot:
• LC03 Kp speed accel: Proportional gain (A.LF.31)
• LC04 Kp speed decel: Proportional gain (d.LF.31)
4. Verify car speed by monitoring Speed/Actual on the Operational Status tab, or use a
hand-held tachometer. If car speed is still not correct, verify the following:
• TORQMAX F5: LM02, US06, LN01, LN02, LN03, and LS02 are set correctly. (LF.11,
LF.20, LF.21, LF.22, LF.23, and LF.42)
• Pattern scaling is 100%.
• If the car is running faster than contract speed parameter:
• TORQMAX F5: Provided LS02 (LF.42) is set to the same value as US06 (LF.20),
then verify that Gear Ratio Reduction Parameter LN02 (LF.22) is set correctly. If
the gear ratio is not correct, it is possible to decrease the value of LN02 (LF.22) in
small (0.10) increments to reach contract speed.
• Magnetek: Decrease the value of A1 Contract Mtr Spd.
• If the car is running slower than contract speed parameter:
• TORQMAX F5: Provided LS02 (LF.42) is set to the same value as US06 (LF.20),
then verify that Gear Ratio Reduction Parameter LN02 (LF.22) is set correctly. If
the gear ratio is not correct, it is possible to increase the value of LN02 (LF.22) in
small (0.10) increments to reach contract speed.
• Magnetek: Increase the value of the A1 Contract Mtr Spd parameter.
Once the car is running at or near contract speed, you must learn the terminal landings in order
to safely run the car to the terminal landings (required before performing drive fine tuning).
(Please refer to “Learning Normal & Emergency Terminal Limit Switches” on page 4-8.)
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