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For optimum control of the elevator, it is recommended to learn the system
inertia and activate the feed forward torque controller. Feed forward control
reduces the dependence on the speed feedback from the motor by predicting
what the system will do and providing the required torque command based
on that prediction.
The rst step in learning the system inertia is to get the car running at contract
speed over multiple oors. If the auto tune process in section 5.5.3 or 5.6.3 has
not been completed, complete the auto tune rst. The counter weight balance
shall be adjusted and nalized. Additionally if required, compensation chains
or ropes shall be installed in their nal state. Note, the best results are possible
with compensation. The learn process is carried out by precisely balancing
the car with weights inside the car. The procedure is outlined below.
1) Pick two oors and run the car only between these two oors. During the
learn process the rate of acceleration will be lower so it might take 2 or
more oors to reach contract speed.
2) Place balanced load in the car.
3) Display the actual motor torque in parameter ru.12.
4) Run the car up and down, note the value of ru.12 once the car is running
at contract speed. When the car is balanced the value will be near zero
and should be about the same in each direction, although the value may
be opposite in sign, i.e. +15 up and - 15 down.
5) Add or subtract weight a small amount at a time, until the values in each
direction are close. Excessive friction in the hoist way may result in higher
torque values.
6) Once the car is balanced, adjust the speed (tach) following error in the
controller to the maximum value as during the learn process the actual
motor speed will not track the controller’s command.
7) Set parameter LF.3 to I Lrn and press enter. The display will con rm with
StArt. Note: if at any point it is necessary to abort the learn process,
press the Func key on the drive’s key pad. Additionally, it is not allowed
to navigate away from this parameter during the learn process.
8) Register a call, the display will change and show the torque value. Monitor
the car speed on the controller and make sure the car is getting up to
speed. If not, increase the number of oors the car is traveling.
5.12 High Speed Tuning
5.12.1 System Inertia
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Initial Start Up
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