Slip Compensation (Pr. 245 To Pr. 247) - Mitsubishi Electric FR-A720-0.4K Instruction Manual

4.8.3

Slip compensation (Pr. 245 to Pr. 247)

The inverter output current may be used to assume motor slip to keep the motor speed constant.
Parameter
Name
Number
245 Rated slip
Slip compensation time
246
constant
Constant-power range slip
247
compensation selection
⋅ Slip compensation is validated when the motor rated slip calculated by the following formula is set in Pr. 245. Slip
compensation is not made when Pr. 245 = "0" or "9999".
Rated slip =
REMARKS
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.
♦ Parameters referred to ♦
Pr. 1 Maximum frequency Refer to page 157
Pr. 3 Base frequency Refer to page 159
Initial Value Setting Range
9999
0.5s
9999
Synchronous speed at base frequency - rated speed
Synchronous speed at base frequency
Adjustment of the output torque
V/F V/F V/F
0.01 to 50% Used to set the rated motor slip.
0, 9999 No slip compensation
Used to set the slip compensation response
time. When the value is made smaller,
0.01 to 10s 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
0 constant power range (frequency range
above the frequency set in Pr. 3)
Slip compensation is made in the constant
9999
power range.
(current) of the motor
Description
× 100[%]
151
4