EM15 User’s Manual
5. Description of Function Codes
99
Diagram 5-33 Voltage of V/F separation
5.21 Group d6: Control Optimization Parameters 1
d6-00
Carrier frequency
Default
Model dependent
Setting Range
0.5kHz~16.0 kHz
It is used to adjust the carrier frequency of the frequency inverter, helping to reduce the motor noise, avoiding the
resonance of the mechanical system, and reducing the leakage current to earth and interference generated by the
frequency inverter.
If the carrier frequency is low, output current has high harmonic wave, and then the motor will increase power loss
and temperature rising.
If the carrier frequency is higher, the power loss and temperature rising of the motor will decline. However, the
frequency inverter will have an increasing in power loss, temperature rising and interference.
Adjusting the carrier frequency will exert influences on the aspects listed in the following table.
Carrier frequency
Low→High
Motor noise
Large→Small
Output current waveform
Bad→Good
Motor temperature rising
High→Low
Frequency inverter terperature
tttttemperature rise
Low→High
Leakage current
Small→Large
External radiation interference
Small→Large
The factory setting of carrier frequency varies with the frequency inverter power. If you need to modify the carrier
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
8.00 Hz
Setting Range
5.00Hz~15.00 Hz
d6-02
PWM modulation mode
Default
0
Setting
Range
0
Asynchronous modulation
1
Synchronous modulation
This parameter is valid only for V/F control.
