Oh yeah... it's a healthy little fan, been sitting around my shop for years, don't remember where it came from.
and yes, it is loud.....
I had built a little enclosure out of foil faced foam-board to keep the sun off my swimming pool pump,
and have this fan blowing through the enclosure when it gets hot out, else the pump motor thermals out.
last week our temps hit 100F (yes, us americanos like to use the F word instead of the C word). 😳
Like I said, loud, you can hear it over the pool pump, so I wanted to see what happened if I slowed it down a bit.
And I do have smaller/quieter fans that I could use, but as I said, I'm experimenting...
Since I've retired from the working world I find myself wasting all kinds of time doing stuff "just because".
Great invitation Aus!
By the way...
Is it possible that some VFD is installed near the Unistream installation?
I found some problem with communication and panel start if some motor with VFD is operated in the same power net.
In my case GND wire of 24V power supply (-) connecting to machine GROUND solve problem.
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.