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| programming lambda lqd power supplies? |
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| ftransform:
Does anyone know how to program the LQD lambda power supplies? I found a manual online, which says to refer to a wiring diagram, which is not in the manual... It has screw terminals on the back labeled: Po +s +dc Rp -dc -s AT ground S+ and DC+ are linked (sense and positive terminal) S- and DC- are linked (sense and negative terminal) Ground is linked to chassis ground No idea what RP, Po and AT are. It has the ability to be programmed by a voltage source and a resistor, I would like to use a voltage source. http://drco.pairserver.com/manuals/lam2.PDF manual with no pictures. :palm: |
| ftransform:
I tried connecting an agilent power supply to the sense and positive pin (as suggested by another lambda manual) and this did not work. I poked the Ro and v- with an agilent power supply and a capacitor exploded. Note to self: dont plug random stuff in. capacitor was replaced and the transistor is ok but no new clues on programming :( I think PO might have something to do with sequencing units, like in parallel. oh, that was easy, you just connect +V to Rp and V- to V-. I figured Rp had to do with the resistor programming but it works fine really. groovy. :-+ now to figure out current programming... hmmm...... :-/O :scared: It does however seem to have a problem, if you adjust the reference voltage too quickly the thing gets stuck. Does anyone have any insight? Is that a limitation, I.E. you cant change the programming voltage too quick? should the sense pins be connected in this case? Also, there is a voltage difference between the programming supply and the output supply (100mV at 20V) Also, when a current is drawn the programming supply needs to supply roughly 1/3 of the current, for 180mA the programming supply needed to supply 60mA. That does not seem right to me.... :-- I must be missing something ah ha, you need to cut the negative sense terminal off from the circuit and leave the positive sense terminal connected. idk if i want to fuck with the current source |
| JimmyMz:
I know you are getting along better than when you started, but I'd like to point out for others that Rp is typically indicative of Parallel Resistor. Good luck with the other issues you are currently tackling. I unfortunately don't own a Lambda PS. |
| ftransform:
--- Quote from: JimmyMz on June 01, 2013, 07:50:33 pm ---I know you are getting along better than when you started, but I'd like to point out for others that Rp is typically indicative of Parallel Resistor. Good luck with the other issues you are currently tackling. I unfortunately don't own a Lambda PS. --- End quote --- it works now, connected to Rp with the V- sense cut off and the +V connected to Vsense+. There is a slight offset (40mV) still. I may be misusing it but it seems to work. At this point I can drive 20V @ 180mA with 20V at <10 mA. I might be misusing the resistor hookup I suppose..... But I am scared to try more things because of the smoke ! what in the hell do AT and PO stand for though? I assume RP means either resistor program or remote program. |
| JimmyMz:
Maybe "Po" is Parallel Operation and "Ta" is Ambient Temperature |
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