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Old 25-01-2018, 11:45 AM   #1
justintime2001
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Would a 15V 250mA Miniature Transformer be suitable for running my PM1 points motors please?
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Old 25-01-2018, 01:18 PM   #2
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No.
Its current is low at just 1/4Amp.

It could charge a CDU (slowly) and the CDU feed the solinoids. But I would be looking for something with higher Amp output, typically 1.0Amp minimum at 15 or 16 volts AC.
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Old 25-01-2018, 01:24 PM   #3
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Quote:
Originally Posted by justintime2001 View Post
Would a 15V 250mA Miniature Transformer be suitable for running my PM1 points motors please?
You need a transformer with a 16volt alternating current output eg
https://www.hornby.com/uk-en/220-240...ansformer.html

A transformer with a DC ouput won't work. The transformer should be marked AC or DC output on the case.


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Old 25-01-2018, 02:09 PM   #4
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Thank you both, I will keep searching.
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Old 25-01-2018, 03:05 PM   #5
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I got the Gaugemaster WM1 to drive CDU and points. It is 16v ac or 12v dc depending on which outlet you use. The 16v ac for points.
Peter
PS you only get to choose one or the other not both.
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Old 25-01-2018, 06:42 PM   #6
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Quote:
Originally Posted by 4VEP View Post
You need a transformer with a 16volt alternating current output eg
https://www.hornby.com/uk-en/220-240...ansformer.html

A transformer with a DC ouput won't work. The transformer should be marked AC or DC output on the case.


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Utter rubbish re DC not working!
Even a CDU outputs DC!
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Old 25-01-2018, 07:47 PM   #7
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Quote:
Originally Posted by Silvernovice View Post
I got the Gaugemaster WM1 to drive CDU and points. It is 16v ac or 12v dc depending on which outlet you use. The 16v ac for points.
Peter
PS you only get to choose one or the other not both.
Thank you Peter, I will get one for sure.
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Old 25-01-2018, 08:12 PM   #8
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Quote:
Originally Posted by Flashbang View Post
Utter rubbish re DC not working!
I was thinking that as I've thrown point solenoids using 12v DC in the past. Not sure if it was a good idea or not, but I knew non model railway solenoids worked on 12v DC and they are similar except they were single ended solenoids.
My theory in testing was the worst it would have done is tripped the overload cut out of the controller if it didnt work while testing. I think I used the higher power Hornby Dublo controller to do the test if I remember correctly.
The reason why I was testing was that I had a plan which didnt materialise at the time, to run a model railway from a car socket fitted with a suitable inline fuse. I wanted to know if it would work should I wanted to do it, as I'd heard it had been done before.

To add to the results. I seem to remember the solenoid did trip the overload cut out at times (If I remember correctly) but it did throw.

Last edited by Mountain Goat; 25-01-2018 at 08:15 PM.
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Old 25-01-2018, 08:15 PM   #9
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I am a little confused now. Do I need to use AC supply to run my PM1 point motors? Also, how many CDU's or what CDU should I use for running 14 point motors?
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Old 25-01-2018, 08:20 PM   #10
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Use AC. While they do throw on DC, keep to the AC at 15-18 volts. With 12v DC, it is a bit below the required voltage. Points can stick so sometimes need the extra power to throw them. (One reason why some of us buy a capacitor discharge unit (CDU) to give the solenoids a good thwack of current.
You only need one CDU for your layout.
You dont have to have a CDU, but it is a nice device to help. It also prevents solenoids burning out should someone apply a constant current to them, as the CDU builds up the current and suddenly releases it in a sudden thwack.
Some CDU's are more powerful then others. This is useful for larger layouts, and where one may need to throw several points at the same time.

Last edited by Mountain Goat; 25-01-2018 at 08:24 PM.
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