TMP High Performance Vector Control Inverter User Manual
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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 TMP 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.
P2.31 Zero frequency threshold
Setting range: 0~400.0Hz
P2.32 Zero frequency hysteresis
Setting range: 0~400.0Hz
The above two parameters are to set zero frequency hysteresis control.
Take analog input AI1 for example, see Fig.6-10:
Startup process:
When the Run command is issued, only afterAI1 voltage arrives or exceeds VS-b, does the
drive start and accelerate to the preset frequency in defined Acc time.
Stop process:
During Dec process, when AI1 voltage reduces to VS-b, the drive will not stop until it
reaches VS-a and the corresponding frequency becomes fa, where fa is the threshold of zero
frequency defined by P2.31, and fb, fa is defined by P2.32.
This function can realize dormancy to save energy, in this way, frequent start and stop at
threshold frequency can be avoided.