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Slip Compensation (pr. 245 To Pr. 247)
Air-conditioning inverter.
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4.4.3
Slip compensation (Pr. 245 to Pr. 247)
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
247
slip compensation
selection
The above parameters can be set when Pr. 160 Extended function display selection = "0". (Refer to page 197)
Slip compensation is enabled when the rated motor 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
Pr. 3 Base frequency
Adjustment of the output torque (current) of the motor
Initial Value
9999
0.5s
9999
Synchronous speed at base frequency - rated speed
Synchronous speed at base frequency
Refer to page 101
Refer to page 103
GP
GP
GP
V/F
V/F
V/F
MFVC
MFVC
MFVC
<V/F><GP MFVC>
Setting Range
0.01 to 50%
Rated motor slip
0, 9999
No slip compensation
Slip compensation response time. When the
value is made smaller, response will be faster.
0.01 to 10s
However, as load inertia is greater, a
regenerative overvoltage fault (E.OV) is more
liable to occur.
Slip compensation is not made in the constant
0
power range. (frequency range above the
frequency set in Pr. 3)
Slip compensation is made in the constant power
9999
range.
Description
 100[%]
95
4

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