How to start and stop variable-frequency fans or water pumps?
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For variable-frequency fans and pumps, when starting up, should the frequency be increased gradually after startup, or should it be set to 10HZ at the beginning before gradually increasing? I’m not sure which method is better, so I’m seeking advice from everyone! In our normal operations, we first start the system, and then gradually increase the frequency from 0HZ until the outlet pressure required by the process is achieved.
For pumps with running shaft bearings, problems are likely to occur at low speeds
For centrifugal pumps and centrifugal fans, we all start at a low frequency and then gradually increase it
Thank you! In other words, does the starting method depend on whether it is a rolling bearing or a sliding bearing?
It starts up normally, with the final operating frequency determined by the inverter or PID according to the process requirements. The PID-related parameters, as well as the timing for the frequency increase and decrease of the inverter, must be set according to the process requirements.
For frequency conversion control, it is generally necessary to first press the start button on-site to power on the frequency converter, and then the specific speed is set via the DCS.