I’m looking to control two of these fans with one dual motor controller. Will this board drive both fans and can I use the same Arduino PWM pin to drive both PWM inputs? https://www.amazon.ca/dp/B07GJYWG6D/ref=cm_sw_r_apan_glt_i_9RG7AANJPB44MAJ507EZ
Hello @ScottM,
The current draw of those fans is 12.7A so I would suggest getting a motor controller that can withstand that amperage continuously. For example:
can I use the same Arduino PWM pin to drive both PWM inputs?
Yes, you can do that. Also if you are planning on controlling them with the same signal you could also use a single channel driver and connect the fans in parallel, but in this case, the driver would have to withstand at least 12.7*2A.
I hope that helps!
Thanks for the reply. I plan to use four of these fans, so I may be able to get away with two driver boards. I’m not sure if the 12.7A is the inrush current or the running current. Although I don’t have it at home right now, I have a 12" version of one of these fans connected to a RB-Cyt-132 and a 12V 4A supply. It runs full speed, but won’t start at full speed because the power supply can’t supply the inrush current it needs. I was able to start it at PWM=200 easily enough, just not 255. Since you confirm that I can wire the motors in parallel, I have a couple of options. One is to buy enough amperage capacity to handle four times the individual fan inrush current or a second option is to start at a lower speed and ramp up over a few seconds to full speed. Once I get my current setup back home, I’ll measure the running current and try to measure the inrush current. I’ll update this thread when I know more. Thanks.
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