User Manual
Chapter 7 - Parameters Description 95
Automatic Flux Regulation
P.140 Magn curr gain
(Magnetizing current gain)
The magnetizing current of the motor, has approximately the no load current value at rated voltage and frequency.
A control of this variable is performed with the changing of its gain. .
The benefit is substantially an availability of motor higher torque at low speeds, obtained with a modality similar
to the "boost voltage" function.
A too high setting can cause undesired oscillation.
N
OTE
!
It is not reconmmended to use this function if sustained operation below 1 Hz is required.
Code
Name
[Code] & Function.
Default
MIN
MAX
Unit
Variation
IPA
P.140
Magn curr gain
0
0
100
%
0.1
424
Anti Oscillation Function
P.160 Osc damping gain
(Anti Oscillation damping gain)
The parameter (current symmetry) is used to eliminate any oscillation or beat in the motor current resulting from
tolerances or configurations capable of generating oscillations within the Inverter/cable/ motor system.
The "0" value set at the factory is effective in many cases.
If necessary this value can be altered (0...100) to provide adaptation to the application in question.
During the calibration of the optimum value it is recommended to set the variations of this parameter with slight
increases.
The frequency operation range is around 10Hz
30Hz .
Code
Name
[Code] & Function.
Default
MIN
MAX
Unit
Variation
IPA
P.160
Osc damping gain
0
0
100
425
SW Current Clamp
P.180 SW clamp enable
(Software current clamp enabling)
To optimize the performance of the inverter, it is necessary to be able to accelerate and decelerate during the
whole ramp time with the maximum current that the inverter can supply to the motor.
The setting of very short ramp times, that would cause an exceeding of the allowable current limits of the drive,
activates the "Current Clamp"circuit avoiding to reach the overcurrent limits and the consequent "OC" trip.
The intervention of the "Current Clamp" circuit, has as consequence an increase of the real time in which the
final speed is obtained.
It is anyway possible the disabling of the function, setting this parameter at zero.
Code
Name
[Code] & Function.
Default
MIN
MAX
Unit
Variation
IPA
P.180
SW clamp enable
[0] Disable (not active)
1
0
1
426
[1] Enable (active)
Current Limit
The drive is provided with an active current limited function.
It is possible to select different current limits, during the ramps or at steady state.
Current limitation is achieved by a PI regulator effect on speed reference (see
P.206
parameter).
P.200 En lim in ramp
(Enabling limit in ramp)
P.200 = 0
Function disabled.
