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To me this sounds like an intermittent connection issue, possibly related to ambient temp the machine has settled to whilst off. I'd be going through every control and power supply connection in the thing, ensuring they are sound. If the issue persists after that, then change power supply/ies and then finally the devices. Don't do them all together as you'll never quite know what fixed the issue.
Is the environment dirty or humid or subject to large vibration? Is the control gear well protected if it is? It could even be bad connections inside the controller or I/O due to such things, and a wiggle here and there might help.
Welcome to intermittent issue problem solving!
An 85W one of these things? Are you sure that's right...not just a model designation? A 6" one of these pulling 85W I've never seen, but if you've got one then I understand why you might be wanting to slow it down as I reckon it would be really loud! You probably also have to have your flying suit and goggles on as you take off. ✈️
These fan types are usually brushless with different methods involved, but they normallly tolerate variable voltage quite well. However you can also get them with inbuilt PWM input signal method for speed control, which might suit your needs far better.
I have a machine with a Unistream 7" modular and some remote I/O attached to a URB-TCP. It has been working fine for about 10 months., but now, occasionally when the machine is powered up, the PLC doesn't establish a connection with the URB-TCP.
The hardware model numbers are:
I/O Adapter: URB-TCP
When it does fail, all the status LED's on the URB are green, except the "Active" LED. I have checked the connections between the URB and the adjacent I/O module and the power supply connections on the front of the URB and they are all good. The cat5e cable between the PLC and the URB has also been verified as OK.
The boot-up of the PLC seems to take quite a long time... a little over 2 minutes.
Sometimes when it fails, not only does the remote I/O communication not get established, but also a couple of fields on my start up screen don't get populated with the related data. (I have the system tags "Panel SW Version.Unilogic Program Name" and "Panel SW Version.Unilogic Project Version" displayed on the start-up screen). It has, at times, booted up with these fields populated, but still no remote I/O communication.
I have not actually been there to hook up my laptop when it fails to see if there are any error codes. The customer "fixes" the problem by powering off/on until it boots up normally.
If anyone could shed some light on this behavior, it would be greatly appreciated. At this point, I'm thinking about replacing the CPU, but I am only guessing.
Sorry for the confusion, we Americanos also call them "muffin"fans...
I'm pretty sure this would be a shaded pole motor..
I've also done the tranny thing in the past, just thought as an experiment I'd try this as it seems I already have the hardware in place.