4-250
Figure 4.4.90 Slip compensation output frequency
18-02: Slip compensation limit
Sets slip compensation limit in constant torque and the constant power operation (Fig.4.4.91).
If 18-02 is 0%, the slip compensation limit is disabled.
Figure 4.4.91 Slip compensation limit
When the slip compensation gain 18-00 at low speed is adjusted, and the actual motor speed is still lower
than the reference frequency, the motor may be limited by the slip compensation limit.
Note: Make sure that the slip compensation limit 18-02 does not exceed the maximum allowed system
limit.
18-03: Slip compensation filter
Set slip compensation filter time in V/F mode
18-04: Regenerating slip compensation selection
The selections to enable or disable the slip compensation function during regeneration.
To enable slip compensation during regeneration caused by deceleration (SLV mode), set 18-04 to 1 in
case speed accuracy is required. When the slip compensation function is used regenerative energy might
increase temporarily (18-04= 1) therefore a braking module might be required.
SLV mode adjustment
18-00: Slip compensation gain
a) Slip compensation can be used to control the full rang speed accuracy under load condition.
b) If the speed is lower than 2 Hz and the motor speed decreases, increase the value of 18-00.
c) If the speed is lower than 2 Hz and the motor speed increases, reduce the value of 18-00.
Slip compensation gain uses a single value for the whole speed range. As a result the slip compensation
accuracy at low speed is high but slight inaccuracies might occur at high speeds.
Adjust parameter 18-02 together with the compensation value or continue to adjust 18-00 if the speed
accuracy at higher speed is not acceptable. Please note adjusting these parameters might impact the
accuracy at lower speeds.
The impact of 18-00 on the torque and the speed are shown in Fig.4.4.92.
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