4-221
18-02: Slip compensation limit
Sets slip compensation limit in constant torque and the constant power operation (Figure 4.3.100). If 18-02 is set
to 0%, the slip compensation limit is disabled.
Slip Compensation Limit
18-02
18-02
F
base
F
max
(01-12)
(01-02)
01-02
01-12
×
( )
Figure 4.3.100 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.
18-03: Slip compensation filter
Sets slip compensation filter time in V/F mode
18-04: Regenerating slip compensation selection
Enable or disable slip compensation during regeneration.
Enable slip compensation during regeneration (18-04=1) in case speed accuracy is required when experiencing
regeneration caused by deceleration (SLV mode). When the slip compensation function is used regenerative
energy might increase temporarily (18-04=1) and a braking module might be required.
SLV mode adjustment
18-00:
Slip compensation gain
a) Slip compensation can be used to control the full range speed accuracy under load condition.
b) If the output frequency is lower than 2 Hz and the motor speed decreases, increase the value of 18-00.
c) If the output frequency 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 full speed range. As a result the slip compensation accuracy at
low speed is high but slight inaccuracies might occur at high speeds. Slip compensation gain is fixed for the full
speed range. Adjust 18-00 or 18-01 to improve speed accuracy at higher speed, however adjusting these
parameters might impact the accuracy at lower speeds.
