Arkel ADrive VVVF, User Manual

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19. HOW TO ADJUST FOR CLOSED LOOP PRACTICALLY
To run the device in closed loop mode (with encoder) apply the below step by step.
● First make the adjustments for open loop and be sure that the elevator is running in open loop
mode.
● Connect the encoder and enter the encoder resolution to parameter
2.3-Encoder Resolution .
● Move the elevator in inspection mode and monitor the motor current. If the current is too high
probably the encoder direction is wrong. Change the order by the parameter
2.18-Encoder
direction.
● Rotor slip frequency must be entered correctly to the inverter. Motor slips are high for old
motors while small for new motors. (Look parameter
2.9-Rotor Slip for calculating the motor
slip)
Try the slip values from 0.7Hz to 3.0Hz with 0.3Hz steps and make a test run with same way
& same load. The appropriate slip value is the one which your motor current is lowest.
Note: If the motor does not reach the estimated rpm, it means that the motor slip is low. If
motor current is not stable and there is a high oscillation, it means that the motor slip is high.
● If you cannot solve the vibration problem. To find the source of problem set KI1, KI0 integral
values of speed controller to minimum and run again.
If vibration is no longer exists this shows that speed controller needs adjustment not motor
parameter. May be integral values are too high or KP difference factors are too small. Run
elevator few times to find best values.
If vibration is still exist when KI0, KI1 is min. This means that problem is at motor
parameters. Try higher no load currents (2.10) and smaller slips (2.9). When vibration
problem is solved set the KI0, KI1 to normal values.
● If necessary change the PI speed controller gains in the
CONTROLLER SETUP menu.