Steps to switch from a variable-frequency pump to a fixed-frequency pump
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1. First, slowly increase the speed of the variable-frequency pump motor, while simultaneously reducing the outlet valve of the variable-frequency pump at a slow pace (to maintain a constant flow rate at the pump’s outlet); it is advisable to manually adjust the opening degree of the control valve to around 50%. 2. When the speed of the variable-frequency pump motor reaches 70%, start the power-frequency pump. 3. Slowly open the outlet valve of the fixed-frequency pump, while slowly closing the outlet valve of the variable-frequency pump (to maintain a constant flow rate at the pump outlet). 4. Stop the operation of the variable-frequency pump once its outlet valve is fully closed. 5. Manually adjust the control valve to regulate the flow rate; once it stabilizes, switch the control valve to automatic mode.
Learn the basic steps for switching pumps
First, set the frequency converter to 100; once stability is achieved, switch from the frequency-controlled pump to the constant-frequency pump, which helps to minimize fluctuations in process flow and pressure.