STEP ET Series - Page 140

Chapter 7 Parameter Explanation
Shanghai Sigriner STEP Electric Co., Ltd.
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Figure 7-34 Dead Time of Forward and Reverse Rotation
P71.07 function sets the PWM modulation mode. 0: 5-segment; 1: 7-segment; 2: < 30% rpm
7-segment, > 30% 5-segment; 3: SPWM mode.
Function code
Name
Setting range
Factory setting
P71.14
PWM Carrier frequency (kHz)
1.1~16.000
8.000
Carrier frequency adjustment: When the sound of the variable frequency motor is too loud, the
carrier frequency can be increased to make the sound lighter, and the carrier frequency interval can
be adjusted by random PWM width.
Note: The default carrier frequency is related to the inverter power. The higher the power, the lower
the default carrier frequency. If it exceeds the default value, please derate for use.
Function code
Name
Setting range
Factory setting
P71.22
Zero velocity threshold (Hz)
0.0~10.0
0.2
P71.22 sets the zero velocity threshold; the default value is 0.2 Hz, and it is considered as zero
velocity when the actual running frequency is lower than the set value.
Function code
Name
Setting range
Factory setting
P71.21
Dead zone compensation mode
1~2
2
P71.23
Forward rotation deadband
compensation (%)
0~65535
90
P71.24
Dead zone threshold coefficient
(%)
0.0~2.0
0.8
P71.21 supports two dead zone compensation modes.
P71.23 compensates the dead time of the transition between the opening and closing of the upper
and lower bridge arms in forward rotation, and the default value is 100%.
Function code
Name
Setting range
Factory setting
P71.29
PWM modulation
0~15
1
PWM modulation mode:
0: Underflow update
1：Overflow and underflow update