When starting the frequency-controlled pump, should the motor be given the frequency control signal before starting the pump, or after that?
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When starting the frequency-controlled pump, should the motor be given the frequency control signal before starting the pump, or after that?
Set it to a value greater than 50, or to 100, or to the usual frequency conversion setting; then adjust the pump by switching between pumps based on the actual flow rate. All of these were taken into account during the design.
Switch the pump using the power-frequency pump; after switching, gradually open the control valve to achieve the desired flow rate through frequency conversion regulation!
What is meant by the control system mentioned below is not automatic; if a single frequency converter is connected to the motor circuit, it is possible to first reduce the frequency of the converter to around 20 Hz. Once starting proceeds normally, the frequency or speed can then be gradually increased to the value required for normal operation. In my opinion, this approach is used to reduce the starting current.
After the pump is started, the frequency conversion signal is set directly to over 90