Motion Control Engineering Nidec iControl, User Manual, Page: 110 / 453

4-21
Controlling Initial Start of Car Motion
iControl AC
4
Figure 4.4 Effect of Speed Pick Delay on the Start of Car Motion
Become familiar with the correlation between what is seen on the scope and what is felt in the
car at the start of motion. Use the scope to adjust brake parameters to provide smooth starts. If
the car has sleeve bearings, be sure to evaluate starts without letting too much time pass
between runs to get accurate rollback information. Once you see the effect of the various param-
eter adjustments on car operation, you will see how important it is to have the brake properly
adjusted.
The value of Repick time (Configuration > Brake > Control tab) can be reduced but doing so will
reduce the time that the brake spends accomplishing a slow lift with Weakening voltage
applied. This will eventually cause the brake to start lifting rapidly. Typically, Repick delay
should not be less than 0.50 seconds.
Volts
Time
Speed Pick Delay just right
Not enough
Speed Pick Delay
Too much Speed Pick Delay
Brake Lifts