Power supply for LPL 4500

[dileep_prakash2]

Folks:

I have a LPL 4500II enlarger from the US which is 110 volts. In India we get 220 volts. I need to adapt the power supply. Would anyone have a circuit diagram of the "Saunders LPL 4500 DMA Regulated Power Supply". It would help me a great deal.

Thanks

Dileep

[charlie_strack]

I don't have a circuit diagram, but a step-up transformer is not very

expensive, so that's an alternative.

 

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Saunders or LPL might provide the diagram to you if you ask.

 

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Charlie

[dileep_prakash2]

I have built a 220 to 110 step down transformer and adapted my 220

volt timer also. But the output I am getting from the Power Supply is

110 volt for the lamp - this should be 82 volts since the lamp is a 82

volt 200 watt. Maybe I've joined some wires wrongly.

 

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Saunders says it cannot help since they dont make the Supply

themselves but outsource. I really dont know what to do.

[colin_benson7]

Hi Dileep,

 

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you might try mailing Robert White (sales@robertwhite.co.uk) in the

UK since they certainly sell the enlarger. Here 220V is the norm (as

I'm sure you already know.) I too have a Saunders enlarger purchased

while I lived in the USA. Once I have somewhere to erect it I intend

to go through exactly the course I've just recommended to you so

please let us know how you get along. For what its worth, I have not

dealt with Robert White's myself but they seem to have a good

reputation in this and other fora.

 

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Best of luck

 

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c

[phil_brammer]

I dont know much about your enlarger but i think that the lamp would

operate off 82V as the if is was designed to run off 110V there would

be no way the regulator could compensate for any drop in power from

the power piont below 110V. If you cannot get a circuit diagram for

your enlarger try using a variac instead of a stepdown transformer.

You can adjust the output voltage. There will still be variences

though as it will not be regulated, but the variations will be

reduced as a function of the stepdown the variac provides (just like

a transformer). You may have to keep an eye on the voltage at the

lamp, hopefully youre exposures dont last for too long as you wont

be able to adjsut while your burning and doging!!

[dileep_prakash2]

Folks:

 

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It seems that if the output from the Power Supply is tested with a

voltmeter it shows 110v. But when a 82v lamp is put and switched on it

comes down to 82. While the supply for the fan remains at 110v. The

electrician I went to showed me this using an ordinary bulb. He says

that AC circuits work this way when they are thru a regulator (which

is built into the power supply). So I hope my problem is solved. But I

am still going to test it out on another enlarger lamp to be doubly

sure before I put my LPL to use.

 

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The other issue was the timer which is also Indian and 220v. This he

sorted out by changing the "relay" (?) and it seems to work fine. I

didnt understand how he did it but now the timer takes its main input

from a regular 220v supply and also has a second input of 110v from

the Saunders LPL supply and then an output back to the LPL supply.

 

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Sounds complicated to me. But I've asked the gent to make me a

circuit diag for the timer change which I am willing to pass on to

anyone who needs it.

 

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Thanks

Dileep