Slip Compensation (Pr. 245 To Pr. 247) - Mitsubishi Electric FR-A700 Instruction Manual

Adjust the output torque of the motor (current)
6.7.3

Slip compensation (Pr. 245 to Pr. 247)

The inverter output current may be used to assume motor slip to keep the motor speed constant.
Pr.
Name
No.
245
Rated slip
Slip compensation time
246
constant
Constant-output region slip
247
compensation selection
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
NOTE
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.
6 - 154
Initial
Setting Range Description
Value
0.01–50% Used to set the rated motor slip.
9999
0/9999 No slip compensation
Used to set the slip compensation
response time. When the value is
made smaller, response will be
0.5s 0.01–10s faster. However, as load inertia is
greater, a regenerative over volt-
age (E.OV ) error is more liable
to occur.
Slip compensation is not made in
the constant output range (fre-
0
quency range above the frequency
9999
set in Pr. 3)
Slip compensation is made in the
9999
constant output range.
Synchronous speed at base frequency Rated speed
--------------------------------------------------------------------------------------------------------------------------------------------- -
=
Synchronous speed at base frequency
Parameters referred to
1 Maximum
Frequency
3 Base frequency
–
×
100%
Parameter
Refer to
Section
6.8.1
6.9.1