SCOV SV600 Series, Руководство пользователя, Страница: 166 / 198

7 Parameter Description SV600 Series User Manual
160
Group A5: Control Optimization Parameters
Function
code
Name
Setting range
Default Property
A5-00
DPWM switchover frequency
upper limit
0.00 Hz ~ maximum frequency
8.00 Hz
☆
This parameter is valid only for V/F control.
It is used to determine the wave modulation mode in V/F control of asynchronous motor. If the
frequency is lower than the value of P5-00, the waveform is 7-segment continuous modulation. If
the frequency is higher than the value, the waveform is 5-segment intermittent modulation. The
7-segment continuous modulation causes more loss to switches of the inverter but smaller current
ripple. The 5-segment intermittent modulation causes less loss to switches of the inverter but
larger current ripple. This may lead to motor running instability at high frequency. Do not modify
this parameter generally.
For instability of V/F control, refer to parameter P3-11. For loss to inverter and temperature rise,
refer to parameter P0-15.
Function
code
Name
Setting range
Default Property
A5-01 PWM modulation
0:Asynchronous modulation
1: Synchronous modulation
0
☆
This parameter is valid only for V/F control.
Synchronous modulation indicates that the carrier frequency varies linearly with the change of the
output frequency, ensuring that the ratio of carrier frequency to output frequency remains
unchanged. Synchronous modulation is generally used at high output frequency, which helps
improve the output voltage quality.
Synchronous modulation takes effect only when the running frequency is higher than 85 Hz. If the
frequency is lower than 85 Hz, asynchronous modulation is always used.
Function
code
Name
Setting range
Default Property
A5-02
Dead zone compensation
mode selection
0: No compensation
1: Compensation mode1
2: Compensation mode2
1
☆
Generally, no need to modify A5-02. Try to use a different compensation mode only when there is
special requirement on the output voltage waveform quality or oscillation occurs on the motor.
For high power inverter, compensation mode 2 is recommended.
Function
code
Name Setting range Default Property
A5-03 Random PWM depth
0: Invalid
1 ~ 10: PWM Carrier frequency random depth
0
☆
The setting of random PWM depth can make the shrill motor noise softer and reduce the
electromagnetic interference. If this parameter is set to 0, random PWM is invalid.