SHENZHEN INVT ELECTRIC CO., LTD. CHV160 Operation Manual
41
to change the motor rotating direction by exchanging any two of motor cables (U, V, W).
Note: After the parameters are initialized, the motor operating direction can be
restored to be its original state. Be caution to use it in the case that changing motor
rotating direction is forbidden after the system commissioning is completed.
2: Forbid inverse operating. Forbidding inverter inverse operation is suitable to specific
application that inverse operating is forbidden.
Function
Code
Name
Description
setting
range
Default
Value
P0.14
Carrier Frequency Setting
1.0
16.0kHz
1.0
16.0
Set by model
This function is mainly used to improve the problem of motor operating noise and inverter
interference to external and so on.
The advantages of using high carrier frequency: relatively ideal current wave shape, less
harmonic current wave and low motor noise
The disadvantages of using high carrier frequency: increased switch loss and inverter
temperature rises, affecting inverter output capacity so that it should be operated at derating
under high carrier frequency conditions; in the mean time, inverter leakage current and its
electromagnetic interference to external are increased.
The situations of using low carrier frequency is on the contrary. Too low carrier frequency
can cause operation unstable, torque reduced and even oscillation at low frequency
When inverter is factory released, its carrier frequency has been set properly. Generally
the user does not need to modify this parameter.
When the user uses a frequency higher than the default carrier frequency, derating is
needed.
Function
Code
Name
Description
setting
range
Default
Value
P0.15
PWM mode
option
0
Fixed PWM mode
1
Random PWM mode
0
1
0
Two PWM mode options, fixed PWM mode and random PWM mode, are provided.
0
The frequency of noise produced by fixed PWM motor is fixed.
1 Random PWM mode can effectively restrain motor noise, but may cause the harmonic
wave increasing.
Function
Code
Name
Description
setting
range
Default
Value
P0.16
Carrier
frequency
adjustment
0 Carrier frequency does not adjust based
on temperature
1
Carrier frequency adjusts based on
temperature
0
1
0
0: Carrier frequency does not adjust based on temperature, so the carrier frequency is
fixed (the set value of P0.14)
1 Carrier frequency adjusts based on temperature: when temperature-rise is increasing,
the inverter automatically decreases the carrier frequency; when temperature-rise is
decreasing, the carrier frequency is increased. The application of this function can effectively
prevent the frequent overheat alarm.
