I want to use a frequency converter and a remote pressure gauge to control a submersible pump, using the on-off control, constant pressure water supply, how to connect and set up
I think you may be wrong! More (money, easy) scheme is using 1 transmission pressure gauge + inverter, constant pressure control. But not switch control. Control is continuous.The only output switch contact transmission pressure gauge is the electric contact pressure gauge. Inside a rheostat, with the change of pressure, sliding rheostat output resistance change. But it should be noted that this watch is certainly three line connection (don't understand NO/NC/COM).Like ABB, ACS510 series and so on, you can access to the X1 2,3,4 terminal, so as to achieve constant pressure control, specifically, you have to look at your inverter manual
With PID function, detailed look at the inverter PID description will understand
It is not suitable to control the frequency converter directly with the contacts of the remote pressure gauge. First of all, the contact jitter, will damage the inverter, and secondly, the number of contacts is not enough.The remote contact signal shall be first entered into the PLC. After finishing, the starting signal of the frequency converter shall be uniformly sent to the PLC. PLC can judge or delay method to control the frequency converter start and stop pump action, to achieve not only switch control water pump, but also soft soft stop pump effect. As for the wiring, relatively simple, PLC contact is connected to the frequency converter to start, stop contact. Of course, the water pump protection circuit is completed. Logical control is done by PLC.
