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Help with PWM Wiring

con95a

Member
Messages
112
Location
Midlands
I bought this PWM with display and switch off eBay.
 
Tried to test it out by wiring up to battery and pump but no joy.
Followed wiring diagram (battery to pwm, pwm to pump) led display lights up, green push switch turns this on and off fine, dial works as "flow rate" moves up and down between 0-100. But pump not being activated.
 
Checked pump wasn't faulty by connecting straight to battery, that's working fine.
 
I'm at a loss... any one know what's up?
280b016a3f86d27105b6ef3eb7ba0fe0.jpg

 
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https://www.ebay.co.uk/itm/DC-6-30V-12V-24V-8A-PWM-Motor-Speed-Controller-With-Digital-Display-Switch/152802157685?_trkparms=aid%3D555018%26algo%3DPL.SIM%26ao%3D2%26asc%3D49480%26meid%3De0522cefb1d24224bd1c160eebc5e362%26pid%3D100005%26rk%3D2%26rkt%3D6%26sd%3D282722814358&_trksid=p2047675.c100005.m1851

Here's a similar one.

It seems easy enough to connect up if the connections are the same.

I would put a voltmeter across the pump + & - to see it there is any current at all. I would then reverse the tester leads to see if the label is incorrect.

Apart from that I have no other suggestions.

Interestingly, this listing looks like the same item but from another supplier.

https://www.ebay.co.uk/itm/CCM5D-DC-6-30V-Max-8A-PWM-Motor-Speed-Controller-With-Digital-Display-Switch/222659643882?_trkparms=aid%3D555018%26algo%3DPL.SIM%26ao%3D2%26asc%3D49480%26meid%3D33c8abb969a6493db558c7a98b986915%26pid%3D100005%26rk%3D4%26rkt%3D6%26mehot%3Dlo%26sd%3D152802157685&_trksid=p2047675.c100005.m1851

If you have a look at the first picture it shows a wiring diagram which is different to the instructions on the item. Unfortunately, there is a good chance you could damage the controller if you reversed polarity.

So another thought is to contact the supplier and ask him for a wiring diagram. Tell them what you have told us about checking the pump directly across the battery. If they come back with a different diagram thats wrong and you damage the unit, it becomes their responsibility to repalce it.

What pump are you using it on? This is only rated at 5 amps and thats what our Shurflo pumps usually draw. (4.5 to 5 amps)

 
https://www.ebay.co.uk/itm/DC-6-30V-12V-24V-8A-PWM-Motor-Speed-Controller-With-Digital-Display-Switch/152802157685?_trkparms=aid%3D555018%26algo%3DPL.SIM%26ao%3D2%26asc%3D49480%26meid%3De0522cefb1d24224bd1c160eebc5e362%26pid%3D100005%26rk%3D2%26rkt%3D6%26sd%3D282722814358&_trksid=p2047675.c100005.m1851
 
Here's a similar one.
 
It seems easy enough to connect up if the connections are the same.
 
I would put a voltmeter across the pump + & - to see it there is any current at all. I would then reverse the tester leads to see if the label is incorrect.
Apart from that I have no other suggestions.
 
Interestingly, this listing looks like the same item but from another supplier.
https://www.ebay.co.uk/itm/CCM5D-DC-6-30V-Max-8A-PWM-Motor-Speed-Controller-With-Digital-Display-Switch/222659643882?_trkparms=aid%3D555018%26algo%3DPL.SIM%26ao%3D2%26asc%3D49480%26meid%3D33c8abb969a6493db558c7a98b986915%26pid%3D100005%26rk%3D4%26rkt%3D6%26mehot%3Dlo%26sd%3D152802157685&_trksid=p2047675.c100005.m1851
 
If you have a look at the first picture it shows a wiring diagram which is different to the instructions on the item. Unfortunately, there is a good chance you could damage the controller if you reversed polarity.
 
So another thought is to contact the supplier and ask him for a wiring diagram. Tell them what you have told us about checking the pump directly across the battery. If they come back with a different diagram thats wrong and you damage the unit, it becomes their responsibility to repalce it.
 
What pump are you using it on? This is only rated at 5 amps and thats what our Shurflo pumps usually draw. (4.5 to 5 amps)
 
 
Yeah the label on mine seemed quite straightforward, + - to power and + - to "motor".
This didn't work so I tried switching connections around on pump, no joy. Then tried switching + - in the controller from pump, no joy.
What I don't understand is if the controller had got damaged in some way, perhaps by reversing polarity, wouldn't the display and push button also stop functioning?
The pump is a cheap one I bought off Amazon, 100psi 4lpm rated at 3amp draw.
The pwm I have is rated to 8amps

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Yeah the label on mine seemed quite straightforward, + - to power and + - to "motor".
This didn't work so I tried switching connections around on pump, no joy. Then tried switching + - in the controller from pump, no joy.
What I don't understand is if the controller had got damaged in some way, perhaps by reversing polarity, wouldn't the display and push button also stop functioning?
The pump is a cheap one I bought off Amazon, 100psi 4lpm rated at 3amp draw.
The pwm I have is rated to 8amps

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Then the only other thing is that the unit is faulty

 
When I connected one of these backwards, it blew a mosfet. If that happened you'd definitively see and smell the smoke, and the unit wouldn't power on. Try opening it up and check for damages, eventually post a picture of the inside and we'll see.

Remember you need to get the PCB out of the casing as there are some electronics on the other side of it as well.

 
When I connected one of these backwards, it blew a mosfet. If that happened you'd definitively see and smell the smoke, and the unit wouldn't power on. Try opening it up and check for damages, eventually post a picture of the inside and we'll see.
Remember you need to get the PCB out of the casing as there are some electronics on the other side of it as well.
Ok I'll post a pic of insides later, still turns on though. Could smell a slight burning smell, slightly. But visually couldn't see anything burnt out. Thanks

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Hmm.. Nothing looks broken on first glance. Though pin 4 on the IC might have some slight scorching? But that could just as well be leftover flux.

Sorry mate, difficult to pinpoint anything, you might be best off complaining to the seller for a faulty unit.

 
I still think you need to get a wiring diagram from the supplier.

I can't see any indication which wires go where from your photos.

If you do know then you need to contact the supplier and tell them what you've told us - its switches on and the counter works but doesn't power the motor. The motor works when connected directly to the battery.

 
I still think you need to get a wiring diagram from the supplier.
I can't see any indication which wires go where from your photos.

If you do know then you need to contact the supplier and tell them what you've told us - its switches on and the counter works but doesn't power the motor. The motor works when connected directly to the battery.
Don't have a wiring diagram as such but the back plate makes it clear.. or should. I'll contact seller see what they'll do

Thanks anyways[mention=125]spruce [/mention][mention=3558]Nudel[/mention]
c19a1dad2a369e047b8d3b21e08c53fd.jpg


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As I mentioned on an earlier reply, another supplier is selling the same item with a different wiring diagram, so something doesn't make sense.

If you've wired it up correctly then it must be a manufacturing fault.

 
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