Powering an electric spindle fan and controlling it's speed

[Goemon]

There is surprisingly little online info on this topic. I guess that not many people here use electric fan cooled spindles but.... in case there are some people here that do use them, I wanted to ask what power source you use and how / if you control the fan speed?

My spindle uses a 24v 1.1a cooling fan. I bought a 24v 1a din rail power supply for it. It works although I can only turn it on or off. This means the fan is on full power at all times and it's as loud as a shopvac. Are these fans meant to be on full power the whole time or am I meant to set it up with some kind of speed control?


I noticed a screw terminal on my VFD labeled 24v. Am I meant to be powering and controlling the cooling fan through my VFD or is that 24v terminal meant for something else?

If anyone here has an electric fan cooled 7.5hp spindle (or more powerful), please can you tell me how loud the fan is before you turn on the spindle?

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[Al_The_Man]

The 24vdc supply is usually for the PLC section (I/O).
You would need to check the power rating of the supply to see if you can use it.
Most DC fans now are BLDC with internal controller IC, in some cases you can use a $4. PWM controller for it.
You could also try a lower voltage to see if that works, 12v e.g.
Al.

[ger21]

Are these fans meant to be on full power the whole time

Yes, they are.

[Goemon]

Yes, they are.

Thanks. That means I can just let it run as is.

Do you still have your electric fan spindle?

[Goemon]

The 24vdc supply is usually for the PLC section (I/O).
You would need to check the power rating of the supply to see if you can use it.
Most DC fans now are BLDC with internal controller IC, in some cases you can use a $4. PWM controller for it.
You could also try a lower voltage to see if that works, 12v e.g.
Al.

I have no voltage control on the din rail psu. It doesn't even have it's own on / off button. I have to pull the plug to turn it off (until I buy a button).

I can't find how many amps the 24v terminal on the Huanyang VFD puts out. I guess I should stick to the din rail psu for now.

Apparently some motion contol boards (like the Centroid Acorn) have a 24v out for spindle fans.

[ger21]

We used to have a machine with two HSK 10HP spindles, and the fans came on when the machine was powered up, and stayed on until it was shut down.
Personally, I'd use power supply a bit larger than 1a for that fan.

[mactec54]

I have no voltage control on the din rail psu. It doesn't even have it's own on / off button. I have to pull the plug to turn it off (until I buy a button).

I can't find how many amps the 24v terminal on the Huanyang VFD puts out. I guess I should stick to the din rail psu for now.

Apparently some motion contol boards (like the Centroid Acorn) have a 24v out for spindle fans.

You can not use the 24v VFD supply for your fan it is only a few milli amp for control circuit supply only

But you can use the built in relay to turn the fan on / off with the VFD, so when the VFD is power up the fan will turn on, just check the amp rating of the relays are good enough for your fan needs

I looks like you brought the wrong 24v power supply it needs to be 3 times the amp rating you are needing

[Al_The_Man]

You can also set the relay output parameter to At Zero Speed which means the fan only comes on when the spindle is running.
Al.

[ericks]

If i had to do it then i'll make a custom unit for this purpose.....a dc motor speed controller, micro and temperature sensor


......the starting of the fan and the speed would depend on the temp of the spindle motor

[Goemon]

We used to have a machine with two HSK 10HP spindles, and the fans came on when the machine was powered up, and stayed on until it was shut down.
Personally, I'd use power supply a bit larger than 1a for that fan.

I got that size because the manual says not to use a psu greater than 24v 1.1a although it doesn't say much more than that (or why).

What size would you recommend? I have a 24v 12a psu that I got for another project. Am I right in assuming that you can't damage the fan with a PSU with more amps than is required as long as it doesn't exceed 24v?

[Al_The_Man]

NO, the fan only draws the current (amps) it requires, a P.S. with anything over its rated current value will work.
BTW, for a fan you don't need a sophisticated supply such as a SMPS, any transformer with a suitable 24v secondary and a bridge rectifier will work.
Do you have details of the fan? If so post them.
Al.

[Goemon]

You can also set the relay output parameter to At Zero Speed which means the fan only comes on when the spindle is running.
Al.

According to the manual, the fan should be left to run for 10 minutes after the spindle is shut off and be turned on before the spindle starts moving.

I have set it up so the fan comes on when I power up the Gecko drive and PC so I won't ever forget to turn it on.

I have a lot more reading up to do before I figure out how to make things happen with relays with specific timings...

[Goemon]

NO, the fan only draws the current (amps) it requires, a P.S. with anything over its rated current value will work.
BTW, for a fan you don't need a sophisticated supply such as a SMPS, any transformer with a suitable 24v secondary and a bridge rectifier will work.
Do you have details of the fan? If so post them.
Al.

What I posted already is everything it says in the manual. It has less than 3 lines on the fan... PDS manuals don't seem to list part numbers for their components. It just says it needs 24v 1.1a.

This is the spindle:

https://www.cncpd.com/product/pds-ad...spindle-motor/