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Old 09-17-2018, 11:04 AM   #1
Cornboats
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Default Erbauer 18-24v battery charger

Does anyone know how to get hold of an electrical schematic for this battery charger? I have Ryobi portable drills but the charger is missing so was wondering if I could use an Erbauer charger which I do have instead. The battery connections can be altered on the charger but the Ryobi batteries are charged through a temperature detector on the negative line. The Erbauer charger has a 3rd terminal but its positive.
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Old 09-17-2018, 04:23 PM   #2
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Default Re: Erbauer 18-24v battery charger

Are you using ni-cad batteries or are you using Li-ion batteries
It makes a big difference which batteries we are talking about

It might be a big maybe ?
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Old 09-17-2018, 04:33 PM   #3
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Default Re: Erbauer 18-24v battery charger

Quote:
Originally Posted by Cornboats View Post
The Erbauer charger has a 3rd terminal but its positive.
You need to know how this 3rd terminal is being used for me to answer your question
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Old 09-18-2018, 03:56 AM   #4
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Default Re: Erbauer 18-24v battery charger

Thanks for taking the trouble to reply. They're Ni-cad batteries. I don't know how the 3rd terminal works, I thought getting hold of a schematic would help me understand. On the Ryobi charger the negative went through the 3rd terminal via a temperature fuse to the negative of the batteries.

On the Erbauer when powered on I get 26v across + & - and 26v across the 3rd terminal and - , so I've assumed the 3rd terminal is +.

I've got 2 Erbauer chargers, 1 has an ac transformer the other has no transformer but instead a massive capacitor 45micro farrad x 450v.
Here's some pics of both.
Attached Images
File Type: jpg capacitor charger1.JPG (172.9 KB, 6 views)
File Type: jpg capacitor charger2.JPG (146.9 KB, 4 views)
File Type: jpg capacitor charger3.JPG (160.9 KB, 4 views)
File Type: jpg Transformer charger1.JPG (156.8 KB, 4 views)
File Type: jpg Transformer charger4.JPG (144.8 KB, 2 views)
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Old 09-18-2018, 07:51 PM   #5
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Default Re: Erbauer 18-24v battery charger

Do you have a battery for this charger if you do can you take the battery case off of it and see how it is wired
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Old 09-19-2018, 02:52 AM   #6
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Default Re: Erbauer 18-24v battery charger

No I'm afraid I don't. I stripped the Ryobi down which is how I know that charging is thro the 3rd terminal.
I keep searching the net in the hope I'll find a schematic. Can you reverse engineer the circuits in the photos I posted?
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Old 09-20-2018, 08:03 PM   #7
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Default Re: Erbauer 18-24v battery charger

Not really this why you need a battery for this charger because it can be a few different ways it can be done one way is just use a thermo switch or a resistor type sensor or “k” type or something similar

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Old 09-20-2018, 08:08 PM   #8
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Default Re: Erbauer 18-24v battery charger

There some ni-cad chargers out that very easy to use and work fairly well

https://www.ebay.com/itm/Ni-MH-Ni-Cd...53.m1438.l2649

One note on this charger you should replace the capacitors in this charger they unknown brands

Last edited by sam_sam_sam; 09-20-2018 at 08:14 PM..
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Old 09-21-2018, 03:01 AM   #9
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Default Re: Erbauer 18-24v battery charger

I looked at the link. Charge rate is 1 amp compared to Erbauer of 2.8amp. I'm not going to resort to buying a replacement just yet, not when I have perfectly good robust chargers- just not configured correctly. I shall perserver a bit longer and endevour to find a wiring diagram.
Appreciate your help.
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