Soft start option for fans.

Discussion and support for MoTeC Power Distribution Modules

Soft start option for fans.

Postby TrophyBurro on Mon Aug 02, 2021 1:49 am

Hi guys I have some fans that start very hight around 40 amps .
Is there a way to set a softstart? They will operate at around 15amps and was hoping to use a single
20 amp output . Not sure if we will have problems at the intitial 40 amp spike
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Re: Soft start option for fans.

Postby adrian on Mon Aug 02, 2021 9:35 am

The PDM doesn't have soft start functionality, however it is designed for devices with a high inrush current. If the continuous current is only 15A then a single 20A output should run it fine.

If you have a look at page 34 of the PDM User Manual it gives you details on how to calculate the trip time for a given current and current limit setting (the value you put in the output configuration). A quick calculation for 40A on a 20A output gives about 10 seconds before tripping. Significantly longer than any inrush would last for.
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