4-18 Manual # 42-02-2223
Final Adjustment
14. If rollback is detected, decrease the value (less positive or more negative) of Pretorque
position compensation, on the Drive > Pre-Torque tab. Repeat until no rollback is
detected on one-floor runs up or down in the lower hoistway. If pull-though is detected,
increase the value (more positive or less negative). Pretorque position compensation has
a range of -5.00o to +5.000.
15. With the car empty, check throughout the hoistway and verify that rollback is not
detected.
16. Place full load weights in the car and check for rollback throughout the hoistway. Verify
that rollback is not detected. Adjust Pretorque gain, on the Drive Pre-Torque tab, if nec-
essary.
17. Again remove all weights from the car. Check for rollback throughout the hoistway and
verify that no rollback is detected. If some rollback has been introduced by adjusting the
Pretorque gain for a full load, optimize the setting for an empty car, since this is the
most frequent condition.
18. Reduce Speed Pick Delay 1, on the Configuration > Brake > Control tab, to the mini-
mum value which still allows the brake to lift fully before motion starts. You should not
feel the car pulling out from under the brake. The brake should lift fully before motion
starts, but avoid unnecessary delay in starting movement.
If this car will be using the load weigher for dispatching functions, e.g. Light load anti-nuisance, etc., you
may want to set the parameters and learn the load values at this time. Please refer to “Load Weigher
Adjustment for Dispatching” on page 4-30.
Drive Control Adjustments
In AC Flux Vector drive applications, when Run Enable (RE) is active, the control system picks
the main power contactor (PM Contactor) and enables the drive unit. The drive applies voltage
to the AC motor to build up magnetic flux. The amount of time it takes to build up flux in the AC
motor (from 200 to 500 ms) depends upon motor characteristics and temperature. AC drive
logic detects the build up of flux in the motor and generates the Drive ON output. At this time,
the motor may have developed enough torque to hold the load.
The motor no load current value is not high enough to hold the car at zero speed when the drive
is enabled. The normal setting for no load current is 30% to 40% of full load current. Pick delay
(Configuration > Brake > Control tab) is used to coordinate the picking of the brake with the
build up of flux. If the delay is not sufficient, the flux will not build up fully and a DRO fault will
occur. Speed pick delay 1 is used to delay the application of the pattern signal to the drive to pre-
vent the car from moving under the brake.
• Pick delay must be adjusted to achieve a smooth start, prevent rollback, and prevent DRO
faults.
• Speed pick delay 1 must be adjusted to prevent movement of the car under the brake.
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