MD280/MD280N User Manual Parameter Description
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Frequency arrival
detection amplitude
Factory default
value
0.0%
F5-17
Setup range
0.00 to 100% (maximum
frequency F0-04)
This parameter is supplementary note to No.4 function (frequency arrival)
of DO output in Group F3.
When the output frequency of the inverter reaches the set frequency value,
this parameter can be used to adjust the detection amplitude, when the
output frequency of the inverter is in the detected width of positive and
negative amplitudes of the setup frequency, it outputs ON signal, as shown
in Fig.6-19:
Output
Frequency (Hz)
Setting Frequency
Frequency Arrival
Detection Signal
(DO Relay )
Detected Amplitude
Time
Time
Output
Frequency (Hz)
Setting Frequency
Frequency Arrival
Detection Signal
(DO Relay )
Detected Amplitude
Time
Time
Fig 6-19 Schematic Diagram for Detected Amplitude of Frequency Arrival
Random PWM gain
Factory default
value
0
F5-18
Setup range 0 to 10
Set the random PWM gain, monotonous and harsh electromagnetic noise
can be changed to the heterogeneous and soft noise, the external
electromagnetic interference can be effectively reduced. 0 indicats that the
gain is zero, the largest gain is ten.
Modulation mode
seletion
Factory default
value
0
0 Asynchronous modulation
F5-19
Setup range
1 Synchronous modulation
In the medium-frequency-motor situation, choose the synchronous
modulation mode to make the output current waveform more stable, more
symmetrical as well as the three-phase current. In the synchronous
modulation mode, the current ripple and electromagnetic noise will be
smaller, but the switching frequency fault increases.
The synchronous modulation mode can be enabled only after the operating
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