Loco battery charger (110v DC) again

Technical queries, 'wants', spares for sale / swap etc.

Loco battery charger (110v DC) again

Postby 31144 » 03 Jul 2011 19:06

Right peeps now that ive twigged how to put pics up has anyone got any info on a 110v DC battery charger that has insides that look like this ??? I am trying to identify the original variable resistor (The one in the picture is one ive fitted which may be the wrong value),Resistor is in the bottom left of the first pic and was proper fried when I got to it,the charger is made by Morrison chargers,Eastleigh,also there are a few abbreviation stickers inside it that I cant work out,TR is obviously transformer,basically the charger will only work on equalise :SNARL:

Iam struggling to i.d the grey rectangular 'box' bottom right in the first pic
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Front cover:

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Re: Loco battery charger (110v DC) again

Postby Mark » 04 Jul 2011 12:16

OSMOR used to be a coil manufacture (many moons ago) and the item bottom right looks like it could be a reed relay (does it have RR near it and 4-5 pins on the under side).

I have to say that the state of the wire wound resistors on the bottom left is a little worrying.
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Re: Loco battery charger (110v DC) again

Postby 31144 » 04 Jul 2011 21:46

Mark,that wire wound resistor is the one I put in but iam convinced its not the right value and wouldnt know how to find out,the original how shall I say this ????? wasnt all there :shock: hence the scorch marks,the Osmor block has 4 terminals on the rear and has CD3795 on one side along with what looks like a date 87/9,Iam not even sure what this board does but I do know its got a couple of timer chips on it and controls contactor ARA,its just a shame that we have such an all singing all dancin charger but it doesnt work properly
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Re: Loco battery charger (110v DC) again

Postby Mark » 06 Jul 2011 08:37

Interesting.

I would guess that the charge current is set using a selector switch(s) on the front (got any pics of the front) which inserts/removes secondary transformer taps to vary the voltage and hence potentialy also the charge current.

It could be that ARA brings in further taps to up the juice more to get a gassing charge going, the period of which is controlled by the timer IC's.

If that is the case then the lack of charge umph suggests an issue with a reg diode somewhere and I would expect these to be mounted on the large heatsink in the pic.

I cant spot anything that is capable of doing electronic current control in those pics.
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Re: Loco battery charger (110v DC) again

Postby 31144 » 06 Jul 2011 22:17

I will get you a pic of the front but yes you are right,charge current is set by a rotary switch on the front which is marked 08/09.....20/HST.....37/58.......47/31 (these loco positions maybe wrong but you catch my drift),4 positions,I dont think the power is controlled electronically as Iam convinced the circuit board is a timer,the ARA contactor will not pull if the Auto/Equalise rotary switch is put to Auto but if you manually push the ARA contactor in it stays in but the charge is still very low,maximum 3 to 4 amps and thats in the high charge position i.e 47/31,if i rotate the switch to 08/09 the needle bearly moves off 0,in equalise its stays at 3 to 4 amps but the ARA doesnt pull and wont stay in which seems normal,Do you think the issue may be connected to what ever is attached to those heatsinks ?? or what else could control the current Mark ??
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Re: Loco battery charger (110v DC) again

Postby Mark » 07 Jul 2011 08:33

Yes Les, I would be having a good look at the diodes and checking them with a DVM.

Also, have you confirmed that the 3 phase supply is supplying 3 phases?
Mark Russell
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Re: Loco battery charger (110v DC) again

Postby 31144 » 17 Jul 2011 00:18

Mark wrote:Also, have you confirmed that the 3 phase supply is supplying 3 phases?


I have now :oops: ,never assume kids that those who say they know what they are doing actually do :!: :!:
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Re: Loco battery charger (110v DC) again

Postby hump shunt » 17 Jul 2011 07:12

was it the supply then ?
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Re: Loco battery charger (110v DC) again

Postby 31144 » 17 Jul 2011 10:31

Yep,there seemed to be a "loose" wire in the main isolator,so when checking the input to the charger it had all 3 phases but what I had never done until yesterday was check the phases once the charger was plugged in and under load,once we had done this we found one of the phases was dropping down to 105v AC :shock: ,so back tracking we found the "issue" in the isolator,said charger now chucks out about 22 amps :lol: ,not before time but to be honest I should never have assumed that the wiring had be done properly by a third party untill I had checked it myself,a lesson learned :roll:
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Re: Loco battery charger (110v DC) again

Postby Mark » 17 Jul 2011 19:19

Excellent news Les!
Mark Russell
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Re: Loco battery charger (110v DC) again

Postby 31144 » 17 Jul 2011 22:15

Mark,Iam quite annoyed to be honest but at the same time bloody made up !!,we have had this charger for about 4 years and all it was was a very badly or "accidently" not tightened wire,anyway thanks for everyones pointers and help,I'll pop the timing circuit back on next week and see if the auto facility works,it may now that we have all our phases as ill bet the phase the board was powered off was the unconnected one :lol:
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Re: Loco battery charger (110v DC) again

Postby martynxbrelec » 25 Jun 2018 17:04

The relay is an Osmor relay, I think that they were taken over by Crydom but a lot of the Osmor style parts are now manufactured by a company called Steinecker. Speak to Andrea at Comus Europe, she may be able to help. Failing that we may be able to provide a work around at XBR Electronics Ltd Eastleigh.
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