Vonsch Quatrofrem Series, Конфигурация и диагностика

Страница: 59 / 180

UNIFREM v.3.41x
10 May 2017 Page 59 from 180
Name [ID] Description Def.
Exp. shift V/f
[92] V/f curve shift exponent in the range from 0 Hz to Frequency shift [98] (page
58).
1,00
1,00 ÷ 2,00
Affects the curvature of the V/f curve in the area to Frequency shift [98] (page 58). The
exponent value 1.00 represents the linear shape and the value 2.00 a quadratic process.
Using an exponent, it is possible to control the non-linear features of induction motor better
near zero frequency .
Excit. time [25] Relative shortening or prolonging of the motor excitation time. 100 %
1 % ÷ 1000 %
Compensation of IR (CIR)
Group of parameters number [973]
Parameters of the IR compensation. CIR is the adjustment of the output voltage according to the motor load
to compensate the voltage drop on stator windings. The purpose of this correction to keep the flux constant
and loss of torque as the load changes.
MENU \ SETTINGS \ CONTROL AND REGULATION \ V/F CONTROL \ V/F CURVE \ COMPENSATION OF IR (CIR)
Name [ID] Description Def.
IRC Filter [523]
Time constant of the filter applied to the output of the IR
compensation function. 100
ms
1 ms ÷ 10000 ms
CIR Frequency [795]
Upper limit of the output frequency, where the IR compensation
is suppressed.
5,0 Hz
Frequency shift [98] ÷ Max.
frequency [111]
ST Controller (STC)
Group of parameters number [29]
Parameters which affect the Starting Torque Controller (STC). STC is used to force the current to the motor
in the selected frequency range. This increases the motor torque. Motor should not be operated permanently
in STC range, unless is cooled sufficiently.
MENU \ SETTINGS \ CONTROL AND REGULATION \ V/F CONTROL \ V/F CURVE \ ST CONTROLLER (STC)
Name [ID] Description Def.
STC Mode
[1590]
Additional STC features selection.
□ P adaptivity Turns on the adaptive function of P term based on stator frequency.
□ I adaptivity Turns on the adaptive function of I term based on stator frequency derivation.
□ STC in regen.
mode
Turns on the STC operation in regenerative mode of operation.
STC Current
[163]
Setpoint value of the starting torque current. 5,00 A
Magnetizing
current [355]
÷
(I
NK
x 1,75)
6
STC stops operating, or the current reference will not be achieved, if the value of Cos Phi
[67] (page 16) is negative or falls below 0.05, or if the converters output voltage reaches
the upper limit. In the frequency range where STC operates, maximum allowable current
increases up to the maximum overload current of the converter.
6
The value depends on the inverter power line. See installation manual.
Freq. STC [28]
Upper limit of the frequency area, where the starting torque controller (STC) is
active.
5,0 Hz
0,0 ÷ Max.
frequency [111]
This parameter limits (upper) the current regulation zone (starting torque). When the motor
operates in this area for a long time, it is necessary to calculate with an excessive motor
overheating and the possibility of the fault " E29-Motor overload (page 33)".
STC Dynamics
[26]
Setting the ST controller dynamics. 0,100 s
0,001 s ÷ 10,000
s
Current controller maintains the current on the value STC Current [163] (page 59), until
the frequency exceeds the value Freq. STC [28] (page 59). This mode can be used to
increase the starting torque to overcome Coulomb friction and hard starts. STC dynamics