Hello. I am brand new here. Please take it easy on my if I'm not asking the right questions.

I would like to control an EBM-Pabst G1G170-AB05-20 electric motor with a dial switch.
The spec sheet from the manufacturer.
http://www.ebmpapst.com/en/products/motors/ecigearmotors/ecigearmotorsdetail.php?pID=9177
This PDF contains a circuit diagram for the control on page 4. The fan itself runs on 120 volts AC plugged into the wall. When there's no PWM the fan ramps up to highest rated rpm. The control circuit is a 2-6 kHz PWM signal with an amplitude of ~30V.

I just want to be able to turn the power on and turn a dial for lowest to highest rpm. I see these $10 pwms on eBay and other places but the khz is too high and don't appear to be adjustable. Any help would be appreciated.

Thank you.

 

Your link doesn't work.

 

Do you want something ready built that you just have to connect up, or do you want to build something?
Can you solder? Could you modify something ready built - e.g. change the capacitor on a pre-built module (with instructions)?

 

I'm pretty handy. I can solder and change various components. I can follow instructions. I don't mind paying someone to do it as long as the price isn't astronomically expensive. If someone tells me what to buy and what to do to it I think I can figure it out.

 

This circuit will do a pretty good job of generating the PWM. You will need a 24V+ supply for the circuitry in the motor and a supply for the '555 circuit (5V to 15V which could be derived from the 24V+ supply with e.g. a 7812 regulator) and a transistor to feed the PWM to the motor circuitry.

 

I guess I was looking for something off the shelf that I can modify or just hook up. I've been looking for a week or so for a own with the proper khz but everything is higher. Was looking at this one because of the display but it's 16khz. I'm not an electronics expert. I'm en electrician with basic knowledge.

 

Was looking at this one because of the display but it's 16khz

But you don't say which one that is.

 

http://www.ebay.com/itm/302177232789

Sorry. I meant to post this.

 

Is it even possible to use something like this and just not go past 60%? With one of these would 60% be 6khz on this 10 khz max scale or am I think incorrectly?

 

http://www.ebay.com/itm/302177232789

Sorry. I meant to post this.

The problem with that is that I can't tell whether it is possible to change the frequency.
This one will do the job, though you might want remove the duty cycle preset and wire a panel pot instead.

 

So I would set the one to 6khz and change the other to a panel pot so it will adjust 0 to 100% easier than having to use a terminal driver.
How would I connect this to the motor? I have a slight idea but don't want to fry anything.

 

The PWM output will connect to pins 4 & 5 of the motor - simple as that.
But you will still need 24V+ for the motor circuit and the supply for the PWM board.

 

I'll need to get a 24 volt DC power supply and a panel mount pot. The w103 pot is 10 k. I have that already in a panel mount. I believe that's the r3 in the photo. I want to see if this PWM is available with an LCD for the duty cycle. I know it's not necessary though. Do you know a good place for the DC power supply? I'll check eBay for that also I guess.

I thank you for this information. It's really appreciated.

 

I believe the motor current says 4 amps. This shouldn't have to have a 24vdc power supply capable of 4 amps should it?

 

The problem with that is that I can't tell whether it is possible to change the frequency.
This one will do the job, though you might want remove the duty cycle preset and wire a panel pot instead.

This PWM is only 8 to 12 volts. I've been checking on eBay and AliExpress. Should it not be 24volts?

 

This PWM is only 8 to 12 volts. I've been checking on eBay and AliExpress. Should it not be 24volts?

That board uses an SG3525 chip, which is rated for up to 35V, so I would think you could bypass/remove the on-board 5V regulator and run it at 24V.
The only problem might be if there are any filter capacitors rated for less than that voltage, so they could pop at that voltage.
If you monitor the current as you increase the voltage, you can tell if any are leaking by a sudden increase in current.

 

That board uses an SG3525 chip, which is rated for up to 35V, so I would think you could bypass/remove the on-board 5V regulator and run it at 24V.
The only problem might be if there are any filter capacitors rated for less than that voltage, so they could pop at that voltage.
If you monitor the current as you increase the voltage, you can tell if any are leaking by a sudden increase in current.

. Looks like there are at least 4 caps on that board. How can I tell if they aren't rated for at least 24 volts? They appear to not have any writing on them.

 

Two 12V wall warts in series would do the job, only a very low current is required.

 

Two 12V wall warts in series would do the job, only a very low current is required.

Have you used the board you posted for me with a 24 volt circuit before? I want to order this stuff this week. Don't want to get it all together and fry something.

 

Have you used the board you posted for me with a 24 volt circuit before? I want to order this stuff this week. Don't want to get it all together and fry something.

No I haven't used it, but it's not too difficult to wire it up.