electric engine cooling fan soft start
Printed From: the12volt.com
Forum Name: Relays
Forum Discription: Relay Diagrams, SPDT Relays, SPST Relays, DPDT Relays, Latching Relays, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=136615
Printed Date: May 03, 2024 at 6:55 AM
Topic: electric engine cooling fan soft start
Posted By: Lubrano
Subject: electric engine cooling fan soft start
Date Posted: May 09, 2014 at 7:13 PM
I am looking for a very simple diagram of a soft start system using a relay, temperature sensor and most likely a MOSFET. Basically, I need to soft start an engine cooling fan the easiest, cheapest way possible. Can someone provide a diagram and some detailed instructions for my project,
Thank you for the help.
Replies:
Posted By: oldspark
Date Posted: May 10, 2014 at 4:11 AM
The cheapest is probably a PICAXE 08M2 ($3) that you program to PWM ramp up the MOSFET and then switch in the paralleled relay when at 100% PWM.
It may also be the easiest...
But both above are subject to POV, plus a PC & serial interface for programming, and the programming. (But heaps of PICAXE stuff is available free of charge.)
I argue for the PWMing of the MOSFET to overcome the need for major heatsinking if using the MOSFET in linear mode.
I have been meaning to do the same for electric window winders & fans etc but haven't gotten a round tuit yet.
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