MITSUBISHI ELECTRIC FR-S520 - Manual (Page 118)

109
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.11 Auxiliary Function Parameters
2
.11.1 Slip compensation
The inverter output current may be used to assume motor slip to keep the motor
speed constant.
Parameter Name
Factory
Setting
Setting
Range
Remarks
95 Rated motor slip - - -
0 to 50%,
- - -
96
Slip compensation time
constant
0.5s 0.01 to 10s
97
Constant-output region slip
compensation selection
- - - 0, - - -
Setting is enabled when
Pr. 30 = "1"
<Setting>
Synchronous speed at base frequency - rated speed
Rated slip =
Synchronous speed at base frequency
×100[%]
Parameter Setting Function
0.01 to 50% Used to set the rated motor slip.
95
0, - - - Slip compensation is not made.
96 0.01 to 10s Used to set the slip compensation response time. (*)
0
Slip compensation is not made in the constant output
range (frequency range above the frequency set in Pr. 3).
97
- - - Slip compensation is made in the constant output range.
* 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.
REMARKS
When making slip compensation at 60Hz<50Hz>, set the maximum frequency to
slightly higher than 60Hz<50Hz>.
In the factory setting status, it is clamped at 60Hz<50Hz>.
2
.11.2 Automatic torque boost selection
You can choose automatic torque boost control.
Automatic torque boost control
Not only gives the motor the optimum excitation but also provides high torque
even in a low speed range.
Parameter Name
Factory
Setting
Setting
Range
Remarks
98
Automatic torque boost
selection (motor capacity)
- - -
0.1 to 3.7kW,
- - -
Setting is enabled when
Pr. 30 = "1"