HV350 Mini Frequency Inverter User Manual
60
Running frequency
TO
Running time
Fig. 6-9 FWD/REV dead time
P2.29 REV prohibited
Setting range: 0, 1
When P2.29=0, this function is disabled. In this case, terminal F/R=OFF, Run FWD;
terminal F/R=ON, Run Rev;
When P2.29=1, this function is enabled. In this case, terminal F/R signal is invaid. Mtor can
only run forward, and switching between FWD/REV is not available.
Running mode of routine program is independent of this function.
In traverse operation mode, both FWD and REV running are allowable, but switching
between FWD/REV is prohibited. Setting FWD/REV direction may not be same as actual
direction, which can be defined by changing phase sequence of the output.
P2.30 Carrier frequency adjustment
Setting range:2.0
～
12.0KHz
Carrier wave frequency can be continuously adjusted within 2.0~12.0KHz.
This function is mainly used to improve system performance, and reduce noise and vibration.
Since HV350 series adopts IGBT as power devices, carrier frequency can be higher. Increasing
carrier frequency can bring following benefits: better current waveform, lower noise, which is
especially suitable for applications that need low noise. However, with the increase of carrier
frequency, it also brings some disadvantages, such as increase of power loss on switching
devices, overheat, low efficiency, etc. Since high frequency carrier produces severe radio
interference, please install filter for application with high requirement on EMI. At the same time,
capacitive leakage current increases, and the wrong action of leakage protector and over current
may happen.
Decreasing carrier frequency, the contrary is the case. Motor noise will increase in lower
carrier frequency. Influence of carrier frequency is different for various motors. Therefore,
optimal carrier frequency should be selected according to practical situation. In fact, with the
increase of motor capacity, carrier frequency should decrease. For motor capacity above 37 kW,
2KHz carrier frequency is recommended.
