Mitsubishi frequency converter FR-F700 series and pressure relaxer control
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Ladies and gentlemen; the Mitsubishi frequency converter FR-F700 series is controlled via a pressure transmitter. To save energy, a pressure variable frequency drive is installed at the pump outlet where the frequency converter is used, to control the pressure at 0.4 MPa. The pressure transmitter is a two-wire EJA transmitter. It cannot be controlled now. I would like to ask how to connect it when it’s in use. The wiring is between terminal 5 and terminal 4; when Pr.79=4, the transmitter does not display any information. Are there any other settings required? As far as I understand, it’s necessary to configure the power distribution – how is that done? Are there any other settings? Provide a detailed explanation of how to carry out installation and debugging. Please give me some advice, thank you
The key is to check whether the inverter has a PID control function built in
http://wenku.baidu.com/link?url=vIeK1wWx9SEbpuNrARwIu3ayJzK6nFNtmzdzD0VQ__DWPpyfJG3IFtpxZ8sePKvSfZ3MGqmpCPv0X1hRhl6u_6oM-74sa5mFm92j3P2PlK3 Baidu Wenku has tutorials available. First, you need to set up your pressure transmitter; it is recommended to use a range of 0-1 MPA. In this way, when the pressure is 0.4 MPA, the transmitter will output a current of 10.4 MA. Then connect the wires according to the manual, and check whether the settings of the frequency converter are correct!
Is there a manual for the Mitsubishi FR-A740-1.5K-CHT variable frequency drive? If so, please send it to me via private message. Thank you.