Vonsch Quatrofrem Series, Конфигурация и диагностика

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UNIFREM v.3.41x
10 May 2017 Page 61 from 180
Name [ID] Description Def.
also be used in applications, where motor overload occurs. If the maximum value is
lower than Permanent current [24] (page 47), MCC ensures permanent operation
of the converter. In the beginning of the operation or near zero frequency, output
current can exceed the limit value set by Max. mot. current [5] (page 71) or Max.
regen. current [549] (page 71).
■ M otoric
Turning on / off MCC for motoric mode of operation. Output current is restricted to Max.
mot. current [5] (page 71) in motoric mode of operation.
□ Regenerative
Turning on / off MCC for regenerative mode of operation. Output current is restricted to
Max. regen. current [549] (page 71) in regenerative mode of operation.
□ High dynamic High dynamic MCC control.
□ Adaptive
dynamic
Dynamics is adaptively adjusted according to MCC adaptivity [667] (page 61).
□ Auto
adaptivity
Dynamics adaptivity is automatically set.
□ Boost Imax off
Turns off Imax boosting above the set value of parameter Max. mot. current [5] (page 71)
for the frequency lower than Freq. break. MCC [1191] (page 61).
P term of the
MCC [353]
Gain value of the maximum current controller (MCC) proportional term. 0,500
0,000 ÷ 30,000
The higher the P term of MCC value, the bigger the damping and lower the current
overshoot caused by load steps and speed changes. On the slow I-term of MCC, lower gain
is set and on the faster term higher gain, so the MCC remains stable. When changing this
parameter, we advise consulting this step always with the VONSCH s.r.o. service.
I term of the
MCC [354]
Integration time constant value of the maximum current controller(MCC). 0,120 s
0,001 s ÷
100,000 s
Determines the current regulation dynamics using the MCC. When changing this
parameter, we always recoomend consulting this step with the VONSCH s.r.o. service.
D term of the
MCC [1047]
Gain value of the maximum current controller (MCC) derivation term. 0,000
0,000 ÷ 100,000
Derivation term is disabled if the value is set to 0 s. Helps to reduce current overshoot
during the step motor load change. When changing this parameter, we advise consulting
this step always with the VONSCH s.r.o. service.
MCC Volt. Gain
[799]
Gain of the maximum current controller (MCC) effect on the motor voltage. 1,000
0,000 ÷ 100,000
In low frequency zones, the MCC effect on the frequency weakens and depending on the
value of this parameter, reduce the motor voltage.
Freq. break.
MCC [1191]
Stator frequency limit, below which MCC reduces the effect of the frequency
correction and prioritize the voltage correction.
5,0 Hz
0,0 ÷ Max.
frequency [111]
Freq. III. region
[1193] Stator frequency, above which the maximal current is decreased to prevent the
operation in the unstable part of the torque-speed characteristics. 150,0
Hz
Nom. frequency
[4]
÷ 500,0
Frequency range above this frequency is called region of power reduction.
MCC adaptivity
[667] Adaptation coefficient of MCC. Value 1 represents the lowest dynamics, value 0 the
highest dynamics.
0,000
0,000 ÷ 1,000
RESONANCE DAMPING
Group of parameters number [512]
Parameters for the damping the resonance of the motor and the mechanical system.
MENU \ SETTINGS \ CONTROL AND REGULATION \ V/F CONTROL \ RESONANCE DAMPING
Name [ID] Description Def.
Resonance
damping [513]
Turning on / off the resonant oscillations damping function during the V/f control
of the motor. Resonance damping can decrease or suppress undesired motor
oscillations, mainly during very low load run.
Turned
off
Turned off Resonance damping is turned off.