TT100
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31
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Carrier-wave frequency of inverter is adjusted by setting this code function. Adjusting carrier-wave may
reduce motor noise, avoid point of resonance of mechanical system, decrease leakage current of wire to earth
and the interference of inverter.
When carrier-wave frequency is low, although carrier-wave noise from motor will increase, the current
leaked to the earth will decrease. The wastage of motor and the temperature of motor will increase, but the
temperature of inverter will decrease.
When carrier-wave frequency is high, the situations are opposite, and the interference will raise.
When output frequency of inverter is adjusted to high frequency, the setting value of carrier-wave should be
increased. Performance is influenced by adjusting carrier-wave frequency as below table:
Carrier-wave frequency
Low → High
Motor noise
Loud → Low
Waveform of output current
Bad → Good
Motor temperature
High → Low
Inverter temperature
Low → High
Leakage current
Low → High
Interference
Low → High
F154 Automatic voltage rectification
Setting range: 0: Invalid 1: Valid
2:Invalid during deceleration process
Mfr‟s value: 0
This function is enable to keep output voltage constant automatically in the case of fluctuation of input
voltage, but the deceleration time will be affected by internal PI adjustor. If deceleration time is forbidden
being changed, please select F154=2.
F155 Digital accessorial frequency setting
Setting range: 0
～
F111
Mfr‟s value: 0
F156 Digital accessorial frequency polarity setting
Setting range: 0 or 1
Mfr‟s value: 0
F157 Reading accessorial frequency
F158 Reading accessorial frequency polarity
Under combined speed control mode, when accessorial frequency source is digital setting memory (F204=0), F155 and
F156 are considered as initial set values of accessorial frequency and polarity (direction).
In the mode of combined speed control, F157 and F158 are used for reading the value and direction of accessorial
frequency.
For example, when F203=1, F204=0. F207=1, the given analog frequency is 15Hz, inverter is required to run to 20Hz. In
case of this requirement, user can push “UP” button to raise the frequency from 15Hz to 20Hz. User can also set
F155=5Hz and F160=0 (0 means forward, 1 means reverse). In this way, inverter can be run to 20Hz directly.
F159 Random carrier-wave selection
Setting range: 0: Not allowed 1: allowed
Mfr‟s value: 1
When F159=0, inverter will modulate as per the carrier-wave set by F153. When F159=1, inverter will operate in
mode of random carrier-wave modulating.
Note: when random carrier-wave is selected, output torque will increase but noise will be loud. When the
F153 Carrier frequency setting
Setting range:
Mfr‟s value:
0.2
～
7.5KW
：
2
～
10K
4K
11
～
15KW
：
2
～
10K
3K