7.3.3 Inertia Learn
The inertia learn is optional and will allow the drive to have less dependence on the
encoder feedback. This will allow the drive to have tighter control and better torque
control of the motor by allowing the drive to predict torque needed during a run. The
Inertia Learn is optional and should be considered an advanced troubleshooting method
for better control which the KP and KI gains do not provide. Most cases where this learn
is useful are for 1000+ fpm PM applications and high friction/weighing Induction
applications. The test must be performed after the motor can spin properly, meaning the
correct speed, direction and with low current.
The inertia learn requires balanced load in the car and will require running the car with
balanced load four times. Start at the middle of the hoistway and run to top landing, then
continue to run terminal-to-terminal until test is done.
The inertia learn mode can be initiated by setting LL10 to the value 2: Start. The learning
is started when the user asserts STO.
The inertia learn mode will be stopped at the end of the fourth run. The drive will update
the inertia value in LC41 and automatically change the value of LL10 to 0: OFF. This will
only work if a new run has been requested and STO hasn't been asserted yet. Both STO
and LL10 must be in off states to end the run.
To complete the inertia learn, use the following steps:
1. Confirm the car can run the full hoistway with no issues with balanced load.
2. Confirm high speed is set to the correct value (If US04 is set to serial or analog
speed, the adjustment will be on the controller. If US04 is binary or digital speed, the
adjustment is in speed profile parameter LS02 - High Speed).
3. Go to parameter
4. LL10 Inertia Learn (HOME SCREEN > F3 PROG > TUNE PARAMETERS > LL10 -
INERTIA LEARN).
5. Change to Start.
6. Follow directions on the screen.
7. After four runs, the test will complete, and average inertia will be used.
7.4 Running the Motor
7.4.1 Running Inspection
Before attempting to spin the motor at inspection speed, a few things need to be
completed. For Induction motors, confirm the drive has been programmed with the
correct data and a motor learn has been completed. An Induction motor can also move in
open loop (LC01 Control Mode set to option 0: Open Loop V/Hz) as long as the motor
data has been programmed. For a PM motor, confirm the drive has been programmed
with the correct data, and a motor and encoder learn has been completed. If any of these
steps have not been completed,  refer to the Initial Start-Up chapter for the required
start-up procedure.
If the above-mentioned tasks are complete, the next step is to run inspection speed.
When running inspection speed monitor the home screen, specifically the screens below:
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