APPENDIX
– Open-Loop Adjustments
181
Appendix
Open-Loop Performance Adjustments
Stalling Attempting to Lift Load
If the motor stalls as it attempts to lift the load,
then until resolved, try the following (in order):
1. Increase the Torque Boost Gain
parameter
2. Adjust the Motor Stator Resistance
parameter
3. Adjust the Motor Mid Voltage
parameter
Note: if no performance change is
observed after any one step, set any
changed value(s) back to the original
value(s) before proceeding onto the next
step.
Increase the Torque Boost Gain Parameter
The Torque Boost function is defaulted
off (TORQ BOOST GAIN (A1)= 0).
Increase the TORQ BOOST GAIN
(A1) in 0.1 intervals and observe
performance.
Adjust the Motor’s Stator Resistance
Measure the stator resistance.
If still stalling after measuring stator
resistance, additionally increase STATOR
RESIST (A5) parameter by increments of
0.1 and observe performance
Adjust the Motor Mid Voltage Parameter
Complete the Mid-volts Adjustment
procedure.
If still stalling after completing mid-
volts adjustment procedure,
additionally increase MOTOR MID
VOLTS (A5) parameter by increments
of 0.5 and observe performance
Note: Avoid increasing the MOTOR MID
VOLTS (A5) parameter too high, since this
effects stopping performance (i.e. coming
into the floor too fast) or can create
Overcurrent Faults
Leveling
Oscillation
Overcurrent
Faults
Leveling Speeds/Times
Different Up vs Down
Decreasing
Take-off Time
Stalling
Attempting to
Lift Load
Rollback or
Bump at Start
Overshooting
Floor
Coming into
Floor Too Fast
Rollback at
Stop
Bump
at Stop
Spotting or
Stalling Going
into Leveling
Undershooting
Floor