Seeking help with pump control
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For the control of medium-voltage (6kV) variable-frequency water pumps in the water treatment industry, which I/O points need to be monitored? Please explain in detail. Is the same true for ordinary chemical dosing variable-frequency pumps, or is the amount required less? Thank you, could someone give some guidance?
If it is used for voltage stabilization, there need to be points indicating the pump motor’s operating, stopped, and fault states, as well as the outlet pressure. There should also be control signals for starting and stopping the pump, along with AO for speed control and AI for speed feedback. Generally, piston pumps are used for dosing; it’s different in that case.
Reply to 1# ayumijie: If what you want to control is pressure, the AI points are the temperatures of motor phases A, B, and C； Front and rear axle temperatures ； Current during motor operation ； Measured pressure ； Frequency converter speed signal ； AO point: Variable frequency control signal from DCS or PLC ； DI point: Motor operation signal ； Electrical fault signal ； Motor shutdown signal ； Heater operation signal ； DO point: Motor startup permit signal ； Motor start signal ； Motor shutdown heater start signal ； In DCS or PLC, interlock or automatic control circuits must be added in accordance with electrical operation procedures and process control requirements