Parameter Adjust the output torque (current) of the motor
FR-E700SC EC 6 - 41
6.3.4 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.
The above parameters can be set when Pr. 160 "User group read selection" = 0.
Slip compensation is validated when the motor rated slip calculated by the following formula is set to
Pr. 245. Slip compensation is not made when Pr. 245 = 0 or 9999.
Pr. No. Name Initial Value Setting Range Description Parameters referred to
Refer to
Section
245
Rated slip 9999
0.01ā50% Rated motor slip.
1
3
Maximum frequency
Base frequency
6.4.1
6.5.1
0/9999 No slip compensation
246
Slip compensation time constant 0.5s 0.01ā10s
Slip compensation response time. When the
value is made smaller, response will be
faster. However, as load inertia is greater, a
regenerative overvoltage fault (E.OVī) is
more liable to occur.
247
Constant-output region slip com-
pensation selection
9999
0
Slip compensation is not made in the con-
stant power range (frequency range above
the frequency set in Pr. 3)
9999
Slip compensation is made in the constant
power range.
NOTES
When performing slip compensation, the output frequency may become greater than the set fre-
quency. 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 invalid.
V/F
V/F
GP
MFVC
GP
MFVC
Rated slip
Synchronous speed at base frequency Rated speedā
Synchronous speed at base frequency
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100%
Ć
=
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