4-268
(Motor no-load synchronous speed
–
Motor full load rated speed)(N) x Motor Poles (P)
Motor Rated Slip Frequency (f) =
120
Load Torque
Speed
Larger Load
Smaller Load
f2
f1
Figure 4.4.99 Slip compensation output frequency
18-02:
Slip compensation limit
Sets slip compensation limit in constant torque and the constant power operation (figure 4.4.100).
If 18-02 is 0%, the slip compensation limit is disabled.
Slip Compensation Limit
18-04
18-04
F
base
F
max
(01-12)
(01-02)
01-02
01-12
×
Figure 4.4.100 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.
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.
