HPV1000-App_Note_12
Position Lock Guide
POSITION LOCK SETUP GUIDE
The position lock is a function that will eliminate rollback in a lift that does NOT have a load
weighing device for pre-torque installed and connected to the drive. This function is only applicable to PM motors.
Note: If pre-torque is used, position lock will be disabled.
1. Position the lift roughly in the
middle of the lift shaft to allow free
movement in either direction
2. Put the lift on to inspection control
3. Set inspection speed to 0m/s so
that when the test buttons are
pressed the lift will run at zero
speed (this will clearly display any
movement on the sheave when
the brake lifts)
4. Make sure the following
parameters are set to match the
recommended start settings as
5. documented in the Table 1
6. Press and hold the test control
buttons (either direction) and note
of how much rollback is observed.
7. Increment PosLoc Strt Time (A1)
by increments of 0.05 sec until you
see an effect on the rollback
(either there is less rollback, the
motor rolls back then rolls forward,
or it rocks back and forth):
Note: If the motor starts to vibrate
or oscillate, dampen the speed
regulator gains PosLoc P-Gain
(A1) in steps of 5 and PosLoc I-
Time (A1) by increments of 0.5
8. Next, increase PosLoc Gain 2 by
increments of 1 until the rollback is
eliminated.
9. Set PosLoc Gain Time (A1) to
0.01.
10. Set PosLoc Decay Time (A1) to
the maximum value (This
maximum value is dependent on
the values of PosLoc Strt Time
(A1) and PosLoc Gain Time (A1),
therefore will vary dependant on
the installation)
11. The inspection speed can now be
reset to its original value and the
lift testing can be completed.
