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Figure4.4.10218-00/18-01Slipcompensationgainversusfrequencyreference

Slip compensation

Frequency

Reference

18-01

18-00

Figure4.4.10318-01Effectontorquespeedcurve

Torque

Speed

Decrease

18-01

Decrease

18-01

Increase

18-01

Increase

18-01

18-05: FOC (Flux Orient Control) delay time

In the SLV mode, the slip compensation of the magnetic ux depends on the torque current and excitation

current. If the motor load rises above 100% while running at the motor rated frequency, the motor voltage and

resistance drops sharply, which may cause the inverter output to saturate and current jitter occur. The magnetic

ux slip compensation will independently control the torque current and the excitation current to prevent current

jitter. For slow speed or xed speed operation, 18-05 may be increased. For fast operation adjust 18-06.

18-06: Slip compensation gain

If the motor is jittering at the rated frequency under full load, the value of 18-06 may gradually be reduced to

zero to reduce current jitter.

SLV2 mode adjustment

Default value of parameter 18-00 is 0.0. ( when 18-00 = 0.0, slip compensation function is off.)

Adjustment of slip compensation gain (18-00) is the following:

a) Correctly set the rated slip and no-load current (02-00).

b) Set slip compensation gain (18-00).

c) Run under load. Measure the speed and adjust slip compensation gain (18-00) with the unit of 0.1.

Notes:

- If the motor speed is lower than the target speed, increase the setting value of low-speed slip compensation

gain (18-00).

- If the motor speed is higher than the target speed, reduce the setting value of low-speed slip compensation

gain (18-00).

VDI100 • Instruction manual 259

gefran VDI100 Series User Manual

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