Replacement for TRA500

Zenzanon Fan · Apr 7, 2021

I need to replace a TRA500 PSU, which is 240v in 24V out. Not the most knowledgeable about these things and am wondering if a 240-24V 15 amp switching PSU will do the same job Something like the one in the link ?

https://www.amazon.co.uk/SHNITPWR-S...eywords=24v+ac+adapter&qid=1617793602&sr=8-21

AgX · Apr 7, 2021

It should work and likely even got an overkill, as I assume the TRA500 being AC/AC, and that switching device even is AC/DC.

Zenzanon Fan · Apr 7, 2021

AgX said:
It should work and likely even got an overkill, as I assume the TRA500 being AC/AC, and that switching device even is AC/DC.

I understand AC is alternating and DC is direct, you don't think this will be an issue. I was going to get the 15 amp to have a little extra, better safe than sorry as they say.

AgX · Apr 7, 2021

If the powers supply only feeds some incandescant lamps, AC or DC does not matter.

albada · Apr 7, 2021

AgX said:
If the powers supply only feeds some incandescant lamps, AC or DC does not matter.

If we believe the links below, DC shortens the life of Halogen lamps. The links:
https://electronics.stackexchange.c...cts-of-ac-vs-dc-for-an-incandescent-bulb-life
https://www.okoun.cz/boards/bastleni?contextId=1068237425

AgX · Apr 7, 2021

With halogen lamps the idea is to settle metal again on the filament. However this settlement is not evenly. Thus sooner or later the filament will be torn.
At first thought the eveness of current and thus of magnetic field at DC makes one expect that the strain on the filament is lesser.
Concerning settlement of metal though Osram state that with high-power 230V lamps at DC feed the longevity is drastically reduced. Well, who does so anyway?´
This effect in addition is lesser at higher wattage lamps.

With low voltage lamps this effect is even lesser.
And there still would be the chance to take out the rectifying stage at all.

Craig75 · Apr 7, 2021

if thats the durst power supply, you can still buy them here
http://www.northernphoto.co.uk/

(or at least you could a few years ago)

AgX · Apr 8, 2021

AgX said:
And there still would be the chance to take out the rectifying stage at all.

Not knowing in detail the process indicated by Osram in which AC is benefitial in the tungsten resettling, the waveform of a switching power-device without rectifying and smoothening stage might be even disadvantageous... So this is a open case. Best to forget on this AC, DC thing at all.

Zenzanon Fan · Apr 9, 2021

Craig75 said:
if thats the durst power supply, you can still buy them here
http://www.northernphoto.co.uk/

(or at least you could a few years ago)

Thanks for the link, will give them a shout.

Zenzanon Fan · Apr 9, 2021

AgX said:
Not knowing in detail the process indicated by Osram in which AC is benefitial in the tungsten resettling, the waveform of a switching power-device without rectifying and smoothening stage might be even disadvantageous... So this is a open case. Best to forget on this AC, DC thing at all.

Thanks for your input. All this technical stuff is above my head If I can not get an original PSU I think I will take a shot at the one on amazon.

Zenzanon Fan · Apr 9, 2021

albada said:
If we believe the links below, DC shortens the life of Halogen lamps. The links:
https://electronics.stackexchange.c...cts-of-ac-vs-dc-for-an-incandescent-bulb-life
https://www.okoun.cz/boards/bastleni?contextId=1068237425

Thanks for the link. Maybe all will be ok with a 24V bulb. Worth as shot if I can't get the original.

Zenzanon Fan · Apr 9, 2021

Thinking about it car headlight bulbs are halogen and they seem to get on fine, they last years ?

AgX · Apr 9, 2021

In the automotive world halogen lamps of 12V and 24V at DC were standard. In the projector and enlarger world halogen lamps of up to 24V at AC were typical.

MattKing · Apr 9, 2021

AgX said:
In the automotive world halogen lamps of 12V and 24V at DC were standard. In the projector and enlarger world halogen lamps of up to 24V at AC were typical.

Many of the LPL enlargers use a 12V 100 watt EFP halogen bulbs. There are others that also use that bulb. It is also used in Eumig movie projectors.

AgX · Apr 9, 2021

That is why I wrote "up to 24V".

lts · Apr 18, 2021

Don't buy such an LED driver if you want to drive a Durst CLS500, 501 or M805 color head.
The bulb need several seconds to start and the fan won't work at all.

Lesson learned the hard way...

AgX · Apr 18, 2021

lts said:
Don't buy such an LED driver if you want to drive a Durst CLS500, 501 or M805 color head.
The bulb need several seconds to start and the fan won't work at all.

Any explanation?

lts · Apr 18, 2021

AgX said:
Any explanation?

No.

Replacement for TRA500

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