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Figure 4.4.102 18-00/18-01 Slip compensation gain versus frequency reference
Torque
Speed
Decrease
18-01
Decrease
18-01
Increase
18-01
Increase
18-01
Figure 4.4.103 18-01 Effect on torque speed curve
18-05: FOC (Flux Orient Control) delay time
In the SLV mode, the slip compensation of the magnetic flux 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 flux slip
compensation will independently control the torque current and the excitation current to prevent current jitter. For
slow speed or fixed 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).
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