VD120 Series Inverter User Manual Parameter Description
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139
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gradually restored to the setting value. This function can reduce the chance of inverter overheat
alarm.
A1-02
DPWM Switching
Frequency Upper Limit
0.00Hz~15.00Hz
12.00Hz
○
Only valid for V/F control.
The wave mode determined by the asynchronous machine V/F running, which is lower than the value
of the 7 stage continuous modulation mode, on the contrary is the 5 stage intermittent modulation
mode.
The switching loss of the inverter is relatively large when for the 7 stages continuous modulation, but
the current ripple is small; switch loss is small under 5 stage intermittent modulation mode, the current
ripple is larger, may lead to the instability of the motor running at high frequency, generally do not
need to modify.
Please refer to the function code F4-11 about V/F running is not stable, on the loss and temperature
rising of the inverter please refer to the function code A1–00.
A1-03
PWM Modulation Mode
LED unit’s digit:
0: Asynchronous modulation
1: Synchronous modulation
LED ten’s digit:
0: Two phase and three phase
modulation
1: Three phase modulation
0x00
◎
Only valid for V/F control.
Synchronization modulation, refers to the carrier frequency linear changes with the output frequency
change to ensure that both ratio (carrier ratio) not chance, generally used in the output frequency is
higher, is conductive to the quality of the output voltage.
At low output frequency (below 100Hz), it is generally not required to be synchronized modulation,
because the ratio of carrier frequency and the output frequency is high, the asynchronous modulation
advantages is more obvious.
When the running frequency is higher than 85Hz, the synchronization modulation is effective, the
frequency of the following fixed for asynchronous modulation mode.
A1-04
Dead Zone
Compensation Mode
Selection
0: Without compensation
1: Compensation 1
2: Compensation 2
1
○
Generally do not need to modify the parameters, only in the quality of the output voltage waveform
have special requirements, or the motor is abnormal oscillation, such as motor, need to try to switch to
select different compensation mode.
High-power is recommended for use with compensation mode 2.
A1-05
Random PWM Depth
0: Random PWM invalid
1~10: PWM carrier frequency random
depth
0
○
Set up random PWM, can make the motor sound of the monotonous grating becomes more soft, and
can help for to reduce the external electromagnetic interference.
When the random PWM depth is 0, the random PWM is invalid. Adjust the random PWM different
depth will get different results.
Summary of Contents for VD120 Series
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