G’day, I’ve got a 24V fan that has 4 wires. Here’s a link to the datasheet:
As you may be able to see, one of these wires is marked as CTRL, along with SENSOR, so I thought this may operate in the same way that 4 wire computer fans do, which I have read a few threads about here. I emailed the manufacturer for some more information as that datasheet is lacking, and they sent me 2 documents (attached here), which are a bit confusing because the information seems to conflict with the above datasheet (for a start is says 48V and the blue/yellow wires are switched?)
In the email reply they said “Please review attached page for PWM signal to control speed using pulse width signal input.”
I’m a bit of a beginner with electronics and can’t really make much sense of the attachments, it seems to indicate speed control is done from 500Hz - 5kHz, this doesn’t seem to be in the same range (25kHz) that the 4 wire computer fans do PWM on, so I’m not sure I’m on the right track.
Can anyone make sense of this for me and point me in the right direction on how to do speed control with this fan?