PE6000 User Manual Description of Function Codes
169
Group A5: Control Optimization Parameters
A5-00
DPWM switch over frequency upper limit Default 12.00 Hz
Setting Range 0.00–15.00 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 this parameter, the waveform is 7-segment continuous
modulation. If the frequency is higher than the value of this parameter, the waveform is 5-segment
intermittent modulation.
The 7-segment continuous modulation causes more loss to switches of the AC drive but
smaller current ripple. The 5-segment intermittent modulation causes less loss to switches of the
AC drive 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 AC drive and temperature
rise, refer to parameter F0-15.
A5-01
PWM modulation mode Default 0
Setting Range
0 Asynchronous modulation
1 Synchronous modulation
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.
At low output frequency (100 Hz or lower), synchronous modulation is not required. This is
because asynchronous modulation is preferred when the ratio of carrier frequency to output
frequency is high.
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.
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