5.Description of Function Codes
EM12 User's Manual
104
frequency, note that if the set carrier frequency is higher than factory setting, it will lead to an increase in
temperature rise of the frequency inverter's heatsink. In this case, you need to de-rate the frequency inverter.
Otherwise, the frequency inverter may overheat and alarm.
d6-01
DPWM switchover frequency upper limit
Default
12.00 Hz
Setting Range
0.00Hz~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 wastage of IGBT switches of the frequency inverter but
smaller current ripple. The 5-segment intermittent modulation causes less wastage of IGBT switches of the
frequency inverter but larger current ripple. This parameter may lead to motor running instability at high
frequency. Do not modify this parameter generally.
For instability of V/F control, refer to parameter d2-10. For wastage of frequency inverter and temperature rising,
please refer to parameter d6-00.
d6-02
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 ratio of
carrier frequency to output frequency is still high, and asynchronous modulation is more superior at such low
running frequency.
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 valid.
d6-03
Carrier frequency adjustment with temperature
Default
1
Setting
Range
0
No
1
Yes
It is used to set whether the carrier frequency is adjusted based on the temperature. The frequency inverter
automatically reduces the carrier frequency when detecting that the heatsink temperature is high. The frequency
inverter restores the carrier frequency to the set value when the heatsink temperature becomes normal. This
function is used to reduces the overheat alarms.
d6-04
Dead zone compensation mode selection
Default
1
Setting
Range
0
No compensation
1
Compensation mode 1
2
Compensation mode 2
Generally, you need not modify this parameter. 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.
Summary of Contents for EM12 Series
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