gefran VDI100 Series

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