Slip compensation (Pr. 245 to Pr. 247)
When V/F control or General-purpose magnetic flux vector control is performed, the inverter output current may be
used to assume motor slip to keep the motor speed constant.
Slip compensation time
The above parameters can be set when Pr. 160 User group read selection = "0". (Refer to page 188)
Slip compensation is validated when the motor rated slip calculated by the following formula is set in Pr. 245. Slip
compensation is not made when Pr. 245 = "0" or "9999".
Rated slip =
When performing slip compensation, the output frequency may become greater than the set frequency. Set the Pr. 1 Maximum
frequency value a little higher than the set frequency.
Slip compensation is always valid when Advanced magnetic flux vector control is selected, the Pr. 245 to Pr. 247 settings are
Parameters referred to
Pr. 1 Maximum frequency
Pr. 3 Base frequency
Adjustment of the output torque (current) of the motor
Synchronous speed at base frequency - rated speed
Synchronous speed at base frequency
Refer to page 96
Refer to page 98
0.01 to 50%
Rated motor slip.
No slip compensation
Slip compensation response time. When the
value is made smaller, response will be faster.
0.01 to 10s
However, as load inertia is greater, a
regenerative overvoltage fault (E.OV ) is more
liable to occur.
Slip compensation is not made in the constant
power range (frequency range above the
frequency set in Pr. 3)
Slip compensation is made in the constant power