Mitsubishi Electric FR-A800, Instruction Manual

Page: 842 / 1042

(G) Control parameters Parameters
5 - 662
5.16.6 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 increase.
Therefore, when the SF-PR is used with the same frequency setting as that of the SF-JR, power con-
sumption may increase 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.)
Pr. Name
Initial
value
Setting range Description
673
G060
SF-PR slip amount adjustment
operation selection
9999
2, 4, 6 Set the number of SF-PR motor poles.
9999 Slip amount adjustment mode invalid
674
G061
SF-PR slip amount adjustment gain 100% 0 to 500%
Setting is available for fine adjustment
of the slip amount.
NOTE The slip amount adjustment mode is not available in the following cases:
During acceleration/deceleration, during DC injection brake operation, during PID control, during
orientation control, during encoder feedback control, during stall prevention operation, during
regeneration avoidance operation, during traverse operation, and while the slip compensation is
valid (Pr. 245).
V/F V/F V/F