Vonsch Quatrofrem Series, Конфигурация и диагностика

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UNIFREM v.3.41x
10 May 2017 Page 133 from 180
Curvatures (exponents) V/f CURVE
Basic V/f curve is a well-known and simple tool to configure the motor control.
8.3.3 IR compensation
This function can be turned on by the parameter „V/f Type (ID 347) = IR compensation“.
MENU \ SETTINGS \ CONTROL AND REGULATION\ V/f
CONTROL \ V/f CURVE \
V/f Type -> IR compensation
The value of the output voltage is automatically corrected during active IR compensation according
to the load of the drive and operating conditions. So the voltage drop in the stator windings of
motor is compensated and constant motor excitation is ensured. In practice, in the motoric
operation mode the voltage increases and in regenerative operation mode the voltage decreases.
Mathematical model, which is the core of IR Compensation does not reach high accuracy near
zero speed, thus it is necessary to adjust the frequency from which the correction starts to apply.
As a rule of thumb, it is usually 0.5 to 3 Hz. The output of correction is filtered with adjustable filter.
IR Compensation parameters:
Parameter
name
ID Description
IRC Filter 52
3
Time constant of the filter applied to the output of the IR compensation
function.
IRC Frequency 79
5
Upper limit of the output frequency, in which the IR compensation is
suppressed.
Prerequisite for the successful deployment of
IR Compensation is the correct value of nominal
motor parameter - Stator resistance [345].
Parameter ID: 345
SETTINGS
– > MOTOR -> SPECIAL PARAMETERS - > Stator resistance [mΩ ]
F [Hz]
V [V]
0
F
NOM
PAR. ID = 4
F
SHIFT
PAR. ID = 98
█ = █ + █
V
MAX
PAR. ID =
495
Expon. V/f
PAR. ID = 91
Exp. shift V/f
PAR. ID = 92