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5.8 Dynamic constant adjustment
Usually, these calibrations are made by the factory and do not need adjusting.
Only re-tuning by KV and DER potentiometer is required.
If high inertia loads are present (ratio 3:1 between load and motor),it is necessary to modify the proportional
gain by “KV potentiometer” and increase the value of derivative by ”DER potentiometer”.
The adjustment procedure must take place with the load connected to the motor.
Connect a function generator with square wave (0,5 Hz +/- 1V) and apply it to the input speed referenc
terminals.
Connect the probe of the memory oscilloscope “channel A” to the test point TP1. (The ground of the probe
must be connected to the GND of the drive).
Adjust in a clockwise(cw) direction the “DER potentiometer”.
Be sure that the load’s motion doesn’t create a safety risk.
Apply power to the drive and start it.
The load will begin to move alternatively; if possible increase the generator amplitude up to +/-2V.
Check the signals in the oscilloscope; the waveforms should be as shown on the right.
Insufficient proportional gain.
Increase the gain by turning clockwise (cw) using
"KV potentiometer" until achieving a situation as
shown on the left.
To reduce the overshoot adjust clockwise (cw) using
"Der potentiometer" until achieving a situation as
shown on the left.
Caution: Do not exaggerate with the gain:
it can cause unnecessary motor heating
caused from ocsillating currents in the motor.
It's possible to increase the velocity loop derivative
constant by inserting a capacitor CDER on the
personalization adjustment. See Chapter 2.4
Signal
Signal
Signal
Signal current (
respect
Test
Test
Test
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