Slip Compensation (Pr. 245 To Pr. 247) - Mitsubishi Electric FR-E700 Series Instruction Manual

Parameter
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.
Pr. No. Name
245
Rated slip
246
Slip compensation time constant
Constant-output region slip com-
247
pensation selection
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.
Rated slip
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.
FR-E700SC EC
Initial Value Setting Range
0.01–50%
9999
0/9999
0.5s 0.01–10s
0
9999
9999
Synchronous speed at base frequency Rated speed
---------------------------------------------------------------------------------------------------------------------------------------------- - 100%
=
Synchronous speed at base frequency
Adjust the output torque (current) of the motor
V/F V/F V/F GP MFVC GP MFVC GP MFVC
Description
Rated motor slip.
No slip compensation
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.OV ) is
more liable to occur.
Slip compensation is not made in the con-
stant power range (frequency range above
the frequency set in Pr. 3)
Slip compensation is made in the constant
power range.
–
Parameters referred to
1 Maximum frequency
3 Base frequency
×
Refer to
Section
6.4.1
6.5.1
6 - 41