(G) Control parameters
SF-PR slip amount adjustment mode
As compared to our conventional SF-JR motor, the slip amount is small for the high-performance en-
ergy-saving SF-PR motor. When replacing the SF-JR to the SF-PR, the slip amount is reduced and the
rotations per minute increases.
Therefore, when the SF-PR is used with the same frequency setting as that of the SF-JR, power con-
sumption may increase as compared to the SF-JR.
By setting the slip amount adjustment mode, the frequency command can be adjusted to keep the ro-
tations per minute of the SF-PR equivalent to those of the SF-JR for power consumption reduction.
● By setting the number of SF-PR motor poles in Pr. 673 "SF-PR slip amount adjustment operation
selection", the SF-PR slip amount adjustment mode is activated.
● The SF-PR slip amount adjustment mode is available only under V/F control.
● Use Pr. 674 "SF-PR slip amount adjustment gain" to fine-tune the rotations per minute. To reduce
the rotations per minute (to increase the compensation frequency), set a larger value in Pr.674. To
increase the rotations per minute (to reduce the compensation frequency), set a smaller value in
Pr. 674. (Lower rotations per minute reduce the power consumption, and higher rotations per
minute increase the power consumption.)
The slip amount adjustment mode is not available in the following cases:
During acceleration/deceleration, during DC injection brake operation, during PID control, during
stall prevention operation, during regeneration avoidance operation, during traverse operation,
and while the slip compensation is valid (Pr. 245).
5 - 544
SF-PR slip amount adjustment
SF-PR slip amount adjustment gain
Setting range Description
2, 4, 6
Set the number of SF-PR motor poles.
Slip amount adjustment mode invalid
Setting is available for fine adjustment
0 to 500%
of the slip amount.