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Author Topic: PWM Fan (Four Wire Fan)  (Read 2181 times)

nomonick77

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PWM Fan (Four Wire Fan)
« on: November 02, 2021, 12:07:06 PM »
Hi, does anyone have a program for a 4 wire fan? I have a BX-DM1E-36ER3-D, and I want to be able to control the speed of the fan. Here's a link to the website I was using to try and understand Pulse Width Modulation with Ladder Logic, "https://www.sanfoundry.com/plc-program-perform-pulse-width-modulation/".

I would appreciate it if you had instructions for how you control the fan speed. It could be with push buttons, a potentiometer, or even just changing the value in the program. I'm not very familiar with Do-more designer but I've done some PLC programming with an Allen Bradley before.

Thanks,
Nomonick77

RBPLC

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Re: PWM Fan (Four Wire Fan)
« Reply #1 on: November 02, 2021, 04:51:32 PM »
What type of fan are you trying to control and what's your application? Some controllers have onboard PWM high speed outputs and there's an instruction that makes this type of control simple. The problem is, you have a relay model which is not appropriate for PWM.

nomonick77

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Re: PWM Fan (Four Wire Fan)
« Reply #2 on: November 03, 2021, 01:11:34 PM »
It's hard to find a link to the exact fan, but it's a DC12V, 1.41A, 4-wire fan. Brand: Jeek, Model: AGE12038-12U.

As for the application, I'm more or less doing this for practice but I would love to be able to control it using something like the dial of a potentiometer or using a thermistor. The only two PLCs I have that I can experiment with are the BX-DM1E-M-D and this BX-DM1E-36ER3-D.

I believe I read in the manual that this one is capable of PWM, so if there's a way to use it for this I would love to try it out.

RBPLC

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Re: PWM Fan (Four Wire Fan)
« Reply #3 on: November 03, 2021, 01:59:52 PM »
They're both capable of PWM, it's just that your specific 36 point model has relay outputs which are not suitable for PWM. You could buy a high speed module to perform PWM.

nomonick77

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Re: PWM Fan (Four Wire Fan)
« Reply #4 on: November 03, 2021, 05:15:17 PM »
Do you have a recommendation for a specific BRX PLC model? I'm not sure if I'll be able to purchase a new PLC currently since this isn't for an official project, but if the price isn't too bad I'll definitely consider it.

franji1

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Re: PWM Fan (Four Wire Fan)
« Reply #5 on: November 04, 2021, 09:16:16 AM »
One of the HSIO expansion modules is all you need, not an actual PLC.  You can attach the HSIO expansion module to either of your BRX PLCs that you already have.

As to which one, I don't know (I'm a software guy).