Thurlby PL320 Single PSU. - UK Vintage Radio Repair and Restoration Discussion Forum

DiachiLaser · 11th Oct 2008, 12:37 pm

Hello,

I am new here, I have a Thurlby PL320 Single PSU.

It looks like this.

I would like to know what it means when the current limit dial has flashing dots on it, it seems to only do it when the current gets to a certain level, which varies depending on how long the PSU has been on. It's usually between 2A and 2.3A this happens, It still permits the current to go higher .

Many thanks,

-Adam

Hermit6345 · 11th Oct 2008, 3:00 pm

The PSU pictured is a dual PSU, so I guess that you only have half of it. The PL320 has a maximum current output of 2.2 amps before it goes into current limit and the dots flash on the display. It sounds as if your PSU is doing what it should. If you have the dual model like your picture, then you can parallel the two halves and get twice the current, or series the two to get up to about 62 volts. Yours might need setting up.

Ian

Vicboduk · 13th Oct 2008, 6:13 pm

Welcome to the forum Adam, the way these usually work - when the output switch is off, the displays will show the set voltage and set current limit. When you switch the output on - the actual voltage and current drawn will be displayed. If you don't intend to use remote sensing then you MUST link the sense and output terminals together (as shown in the picture). If the PSU is working correctly the voltage should remain constant until you draw a current in excess of your set limit, then you should then see the voltage decrease and the dots of the current display flash but the current should go no higher than your setting.
If this isn't happening something is wrong!
Vic

11th Oct 2008, 12:37 pm	#1
DiachiLaser Retired Dormant Member Join Date: Oct 2008 Location: Glasgow , scotland Posts: 1	Thurlby PL320 Single PSU. Hello, I am new here, I have a Thurlby PL320 Single PSU. It looks like this. I would like to know what it means when the current limit dial has flashing dots on it, it seems to only do it when the current gets to a certain level, which varies depending on how long the PSU has been on. It's usually between 2A and 2.3A this happens, It still permits the current to go higher . Many thanks, -Adam Attached Thumbnails

11th Oct 2008, 3:00 pm	#2
Hermit6345 Rest in Peace Join Date: Oct 2006 Location: North Wiltshire, UK. Posts: 638	Re: Thurlby PL320 Single PSU. The PSU pictured is a dual PSU, so I guess that you only have half of it. The PL320 has a maximum current output of 2.2 amps before it goes into current limit and the dots flash on the display. It sounds as if your PSU is doing what it should. If you have the dual model like your picture, then you can parallel the two halves and get twice the current, or series the two to get up to about 62 volts. Yours might need setting up. Ian

13th Oct 2008, 6:13 pm	#3
Vicboduk Hexode Join Date: Aug 2007 Location: S.W. London, UK. Posts: 416	Re: Thurlby PL320 Single PSU. Welcome to the forum Adam, the way these usually work - when the output switch is off, the displays will show the set voltage and set current limit. When you switch the output on - the actual voltage and current drawn will be displayed. If you don't intend to use remote sensing then you MUST link the sense and output terminals together (as shown in the picture). If the PSU is working correctly the voltage should remain constant until you draw a current in excess of your set limit, then you should then see the voltage decrease and the dots of the current display flash but the current should go no higher than your setting. If this isn't happening something is wrong! Vic __________________ It has to be here... I've just put it down! Last edited by Vicboduk; 13th Oct 2008 at 6:25 pm.