112 Chapter 7 - Parameters Description User Manual
PWM Setting
P.500 Switching freq (Switching frequency)
Setting of the modulation frequency of the drive.
P.501 Sw freq reduc en (Switching frequency reduction enabling)
When enabled, the modulation frequency is automatically reduced, when the output frequency of the drive is
below 5Hz.
This in particular, can avoid the overheating of the motor at low speed ,caused by high commutation in its
winding. Furthermore it improves the output sinuswave form, providing a smoother rotation.
P.520 Overmod max lev (Overmodulation maximun level)
Setting of the overmodulation maximum level.
This function increases the output voltage, providing as consequence a higher torque availability.
A setting too high of the parameter could be increases the distortions of the output voltage and create
undesired vibrations of the system.
P.540 Out Vlt auto adj (Output voltage automatic adjustement)
The voltage applied to the motor terminal is defined by the parameter Max output voltage (P.061), and it is
strictly correlated to the value of the mains voltage.
This function can make independent the motor output voltage from eventual fluctuation of the mains, through
an automatic adjustment of the first.
Code Name [Code] & Function. Default MIN MAX Unit Variation IPA
P.500 Switching freq [0] 1kHz (*) 0 10 482
[1] 2kHz
[2] 3kHz
[3] 4kHz
[4] 6kHz
[5] 8kHz
[6] 10kHz
[7] 12kHz
[8] 14kHz
[9] 16kHz
[10] 18kHz
P.501 Sw freq reduc en [0] Disable 0 0 1 483
[1] Enable
P.520 Overmod max lev 0 0 100 % 484
P.540 Out Vlt auto adj [0] Disable 1 0 1 485
[1] Enable
Dead Time Compensation
The "dead time compensation" fucnction allows for compensation of the output voltage distorsion due to IGBT voltage
drop and its switching characteristics.
Distorsion of output voltage may cause non uniform, non smooth shaft rotation in open loop control.
Throgh the two parameters it is possible to set a voltage value and the compensation variation, called Gradient.
P.560 Deadtime cmp lev (Dead time compensation level)
Dead time compensation level.
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