Instruction manual

151
4
PARAMETERS
4.2.45 Slip compensation (Pr. 245 to Pr. 247)
Pr. 245 "rated motor slip"
Pr. 246 "slip compensation response time"
Pr. 247 "constant-output region slip compensation selection"
The inverter output current may be used to assume motor slip to keep the motor speed
constant.
<Setting>
Parameter
Number
Factory
Setting
Setting Range Remarks
245 9999 0 to 50%, 9999 9999: No slip compensation
246 0.5 0.01 to 10 s
247 9999 0, 9999
9999: Slip compensation is made in
the constant output region when
Pr.245
≠ "9999"and slip
compensation is selected.
Rated slip =
Synchronous speed at base frequency - rated speed
×100[%]
Synchronous speed at base frequency
Parameter
Number
Setting Function
245
0 to 50% Used to set the rated motor slip.
9999 Slip compensation is not made.
246 0.01 to 10 s Used to set the slip compensation response time. (Note)
247
0
Slip compensation is not made in the constant output
range (frequency range above the frequency set in Pr. 3).
9999
Slip compensation is made in the constant output region
when Pr.245
≠ "9999"and slip compensation is selected.
Slip compensation is not made when Pr.245 = "9999"
Note: When this value is made smaller, response will be faster.
However, as load inertia is greater, a regenerative overvoltage (OVT) error is
more liable to occur.
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