Adjust The Output Torque (Current) Of The Motor; Slip Compensation (Pr. 245 To Pr. 247) - Mitsubishi Electric FR-E700 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.
Name
No.
245
Rated slip
Slip compensation time
246
constant
Constant-output region slip
247
compensation 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
frequency. 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-E700 EC
Initial
Setting Range Description
Value
0.01–50% Rated motor slip.
9999
0/9999 No slip compensation
Slip compensation response time.
When the value is made smaller,
response will be faster. However,
0.5s 0.01–10s
as load inertia is greater, a regen-
erative overvoltage fault (E.OV )
is more liable to occur.
Slip compensation is not made in
the constant power range (fre-
0
quency range above the frequency
9999
set in Pr. 3)
Slip compensation is made in the
9999
constant power range.
Synchronous speed at base frequency Rated speed
= --------------------------------------------------------------------------------------------------------------------------------------------- -
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
Parameters referred to
1
3
–
×
100%
Refer to
Section
Maximum fre- 6.4.1
quency
Base frequency 6.5.1
6 - 41