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UNIFREM v.3.41x
10 May 2017
Page 136 from 180
Example:
Slip compensation activity on the real drive
(thin line
–
stator frequency, thick line
–
motor current).
Model of slip for its correct operation requires proper values of motor parameter.
Parameter name
ID
Description
Nom. power [W]
357
Necessary to calculate the nominal slip.
Nom. frequency [Hz]
4
Nom. revolutions [rpm] 356
Stator resistance [mΩ ]
345
The same conditions as for IR compensation
Slip is compensated
exactly by the actual slip assessed on the difference of the stator and rotor
frequency in V/f (scalar) closed control.
Parameter ID: 193
SETTINGS
–
> CONTROL AND REGULATION
–
> V/f CONTROL -> SLIP COMPENSATION ->
Slip restriction = turned on
When this mode is enabled, converter will adjust the setpoint
frequency so as not to exceed the maximum allowable slip from
parameter Maximal slip [Hz] [177]:
Parameter ID: 177
SETTINGS
–
> CONTROL AND REGULATION
–
> V/f CONTROL -> SLIP COMPENSATION ->
Maximal slip [Hz]
"W40-Slip restriction" warning message is generated. This state is ended after declining load on
the motor and stator frequency increasing is allowed.
8.4 Maximal current controller (MCC)
Maximal current controller is a standard function of UNIFREM 400 converters, and its function is to
restrict output current into the motor by correcting the output frequency. Function, as well as the
controller itself, are activated in the parameter:
Parameter ID: 352
SETTINGS
–
> CONTROL AND REGULATION
–
> V/f CONTROL -> MAX. CURRENT
CONTROLLER (MCC) -> Max.current contr. = motoric or = regenerative
The controller operates in motoric and regenerative operating mode.
A.
–
a small load
increase caused a
small slip
compensation.
B.
–
greater load
increase caused
greater slip
compensation.
B
A
Содержание Quatrofrem Series
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