Atten TPR-3005T-3C Power Supply

[Chet T16]

As mentioned in another thread, i bit the bullet and ordered one of these. Double 30V 5A output with a third 2.5/3.3/5V 3A output

http://www.attenelectronics.com/productBody.aspx?id=103&bid=25&sid=130

The price was just under €230 with Fedex delivery.

The box looked like it had been through the wars when it arrived and sure enough when i opened it there was some damage





Luckily there was nothing behind that part of the case so i fired it up. Hmmm, channel 1 display wasn't quite right





Poking with a finger sorted it



Time to open it up so! Couple of random shots. Seems to be up to the same standards as my other Atten stuff, all wires tired and connectors glued in place.









I took the screen out and one of the plastic screens at the front was a bit out of place fixing that and putting it back together seemed to do the trick although both screens are a little tempermental., sometimes needing a poke to display properly. I'm going to take it apart and put some spacers in to keep an even pressure on the screens

Couple of measurements with my new fluke, no load









And the third output







If someone tells me what sort of tests to do i'll do them when i get a chance

Can someone how parallel/series mode works? I can't undersdtand the manual

Also, only negative i see so far (apart from the screens!) is that theres no switches for the outputs, only a main power switch

[amspire]

Independent mode:  Both main supplies are totally independant  - they are not connected at all. If you want to connect them together, you can do it in any way you like.

Parallel mode: Both supplies are in parallel to double the current rating. So for the main supply, the two + connections should be shorted together. Same with the two - connections.  I would assume one power supply will become slave to the other, so I would think that the left controls (or it could be the right) controls both supplies.

Series mode: The + terminal of the left main supply is shorted to the - of the right supply, making it a +/- supply.  Very often in this mode. one supply is slaved to the other to give balances +/- volts, so again both supplies may be controlled by the left controls (or right). A bit of experimenting will work out what is going on.

In both the parallel and series mode, they may have left the current limit control for the slave operational, so test that.

Richard.

[Chet T16]

Thanks Richard, i'll give it a going over and see if i can figure out what way its setup

If i wanted to be able to switch off the outputs independently could i use a suitable relay on the +ve terminals or would i need to switch the -ve as well? (i recall seeing a tutorial video on a LM317 build and he said a relay was better as a switch as it had lower resistance, open to corrections/suggestions though)

[saturation]

Sorry to see the large dent.  What country was it shipped from? 

Before checking that the output specifications for ripple under load, stability etc., it would be prudent to inspect for more damage, particularly to the PCB and components. 

In one photo:

Those power resistors are sloppily assembled, two look to be near shorting against the case, which should be chassis grounded.  It also appears there is no support for the PCB pictured other than the power components screwed to the casing as a heat sink.  Functional but not good practice.

[Chet T16]

Hong Kong, of course It had a two day stopover in Paris. Maybe it went out, got drunk and had a fight with a frenchman!

Thanks for pointing that out, i will check it out and get some better pictures

[saturation]

You're welcome.  Makes you think there is truth to this supposed candid video of China Post in action:




Recorded in 5/11:

Hong Kong, of course It had a two day stopover in Paris. Maybe it went out, got drunk and had a fight with a frenchman!

Thanks for pointing that out, i will check it out and get some better pictures

[Chet T16]

Hadn't seen that second one! Nasty!

I flattened it out a bit so i'm not too worried. It was packed very well, the seller had but it in a bigger box with extra packaging so i can't really fault them

[Chet T16]

I had it apart again and checked those resistors. Theres plenty of room around them, the pics above are deceptive.

The boards are unsecured as you said.

[saturation]

Great.  Overall its should be fine, the semiconductor leads were not designed to support more weight than its own, but it can work.

I had it apart again and checked those resistors. Theres plenty of room around them, the pics above are deceptive.

The boards are unsecured as you said.

[Shadow]

Hello.
I have same power supply model. After 1 year of using cooling fan stop working. I suspect that problem is in KSD-01F termo switch. At least i can nor see that it shorts even temperature is more than45 degree.
I ordered replacement switch and will see if the problem on it.
BTW has anyone schematic of this power supply?

WBR,

[meandr]

BTW has anyone schematic of this power supply?

[meandr]

Hello, I'm looking for a circuit for the Atten tpr3005t-3c laboratory power supply

[tunk]

Please don't double-post. What's the problem?

[meandr]

Hello, I'm looking for a circuit for the Atten tpr3005t-3c laboratory power supply

[meandr]

Both channels do not work, they show only 0.4 Volts, 2.5v 3.3v 5v - the third channel is working fine, I want to figure it out. Thanks