Function Applications
-493-
4.4.11 Auxiliary Control
Para. No. Name
Default
Value Range Description
A5-00
DPWM
switchover
frequency upper
limit
12.00 Hz
0 to maximum
frequency (F0-10)
The AC drive supports two PWM modes:
CPWM and DPWM. When the running
frequency is higher than A5-00
(switchover frequency), the DPWM mode
is used. When the running frequency is
lower than A5-00 (switchover frequency),
the CPWM mode is used. The DPWM
mode can improve the AC drive
efficiency, and the CPWM mode can
reduce the motor noise.
Increasing the value of this parameter to
the maximum frequency will reduce the
motor noise.
A5-01
PWM modulation
mode
0
0: Asynchronous
modulation
1: Synchronous
modulation
Current output oscillation or high
harmonics can occur if the carrier
frequency divided by the running
frequency is less than 10. In this case,
you can use the synchronous modulation
mode to reduce current harmonics.
0: Asynchronous modulation
In this mode, the carrier frequency and
signal wave frequency are not
synchronized. The carrier frequency
usually remains unchanged. The carrier
ratio changes with the signal wave
frequency.
1: Synchronous modulation
In this mode, the carrier frequency and
signal wave frequency are synchronized.
The carrier frequency and signal
frequency change simultaneously, and
the carrier ratio remains unchanged.
Therefore, the number of transverse
SPWM pulses formed in one cycle is fixed,
and the equivalent sine wave has good
symmetry.
A5-03
Random PWM
depth
0
0: Random PWM
inactive
1 to 10: Random PWM
depth
If the motor noise is strong, setting A5-03
to a non-zero value can suppress the
motor noise. A larger value indicates
better noise suppression effect. However,
an excessively high value may affect
motor control. Therefore, set this
parameter to 1 at the beginning of
commissioning and then increase it by 1
each time as required.
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