Selection of soft start mode for 55KW booster pump
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There are two 55KW booster pumps at the site, each equipped with a soft starter for starting purposes. The starting modes available are voltage ramp soft start and current limiting soft start – which one should be chosen? If choosing a voltage ramp, what value in seconds should be set for the soft start time?
2 minutes or 45 seconds? I forgot; check it and remember to tag me
There is a time relay inside the soft start cabinet; it’s right there on top
Look for the instruction manual; it explains the two startup modes. It seems we always chose the current-limiting mode before. As for the time, there should be recommended values in the manual as well – it seems we always used 2 minutes
This post was last edited by h20090630 on 2020-5-12 at 11:32. Either method is acceptable; for voltage ramp soft start, it’s possible to set the start time. The calculations are rather complicated, and most manuals provide recommended values – it’s best to avoid triggering alarms. For current-limiting soft start, it is necessary to determine the nature of the load, as soft start involves voltage reduction during startup; with a low current-limiting factor, the torque generated may not be sufficient, which can trigger protection mechanisms. It is recommended to set the device’s current-limiting factor at 3.6–4 times, and to increase this value slightly each year.
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