HELP! TM PSG1 Wiring Question.

mcguyver · April 6th, 2006, 23:32

The circuit board is not a resistor assembly but a low-resistance switch using the dry contacts of transistors rather than the standard contacts of a standard AEG switch. I'm sorry to say but you DO need it.

I take it that you also replaced the stock PSG/1 switch with Systema's? That is basically a low current micro-switch only suitable for triggering the base terminal on the transistors (2 of them) and will not run your motor. The transistors switch the negative side of the circuit, which is opposite the normal AEG switching of the positive side.

The transistors are a good idea, in theory, but are prone to lots of potential failure points and can be fussy if abused. The 50N03 transistors that Systema uses are MOSFETs rated for 50 amps each and 2 paralleled are good for 100 amps. You need this type of switching capacity, along with a BIG battery and ultra high torque motor to run that 300% spring.

I would keep looking for a replacement board as you REALLY DO NEED IT. It's not one of those "would be nice to have, but I'll do without for now" kind of things. A 300% increase in load will result in a 900% increase in inrush current (300% squared) in the worts case scenario. The stock switch won't last (if you want to use that) and the Systema microswitch will die a quick death.

Read this thread for more info:

http://www.airsoftcanada.com/showthread.php?t=22784

whybenormal · April 7th, 2006, 03:01

so wouldn't switching out the 300% and putting in a 200% work?

mist3r_frag · May 2nd, 2006, 17:46

Thanks for all the help, we got 1 of our 2 PSG-1's working. We chrono'd (or however you spell it) and it was firing at 560fps which is about 40fps less than it's previous peak. It has been sitting for quite some time and the battery was so/so so hopefully we'll get this beast peggin' again in the future. Thanks for all your help, guys!!!

vtats · May 7th, 2006, 02:26

I can understand why the shop did a piss poor job of wiring in the systema switch relay. The installation guide that came with it is CRAP! the pic of the completed wiring is so poor that you can not tell what is what.

If anyone has a pic of a completed systema switch wiring for a PSG1 you would be my hero
Or at least a "which wire goes where guide"

This wiring has me baffled!

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April 6th, 2006, 23:32	#16
mcguyver Trader rating Join Date: Aug 2005 Location: Northern Alberta	The circuit board is not a resistor assembly but a low-resistance switch using the dry contacts of transistors rather than the standard contacts of a standard AEG switch. I'm sorry to say but you DO need it. I take it that you also replaced the stock PSG/1 switch with Systema's? That is basically a low current micro-switch only suitable for triggering the base terminal on the transistors (2 of them) and will not run your motor. The transistors switch the negative side of the circuit, which is opposite the normal AEG switching of the positive side. The transistors are a good idea, in theory, but are prone to lots of potential failure points and can be fussy if abused. The 50N03 transistors that Systema uses are MOSFETs rated for 50 amps each and 2 paralleled are good for 100 amps. You need this type of switching capacity, along with a BIG battery and ultra high torque motor to run that 300% spring. I would keep looking for a replacement board as you REALLY DO NEED IT. It's not one of those "would be nice to have, but I'll do without for now" kind of things. A 300% increase in load will result in a 900% increase in inrush current (300% squared) in the worts case scenario. The stock switch won't last (if you want to use that) and the Systema microswitch will die a quick death. Read this thread for more info: http://www.airsoftcanada.com/showthread.php?t=22784 __________________ Age verifier Northern Alberta Democracy is two wolves and a sheep discussing what's for dinner. Freedom is the wolves limping away while the sheep reloads. Never confuse freedom with democracy.

April 7th, 2006, 03:01	#17
whybenormal Trader rating Join Date: Apr 2006 Location: Kelowna BC	so wouldn't switching out the 300% and putting in a 200% work?

May 2nd, 2006, 17:46	#18
mist3r_frag Trader rating Join Date: Mar 2006 Location: International	Thanks for all the help, we got 1 of our 2 PSG-1's working. We chrono'd (or however you spell it) and it was firing at 560fps which is about 40fps less than it's previous peak. It has been sitting for quite some time and the battery was so/so so hopefully we'll get this beast peggin' again in the future. Thanks for all your help, guys!!!

May 7th, 2006, 02:26	#19
vtats Trader rating Join Date: May 2006 Location: Florida	I can understand why the shop did a piss poor job of wiring in the systema switch relay. The installation guide that came with it is CRAP! the pic of the completed wiring is so poor that you can not tell what is what. If anyone has a pic of a completed systema switch wiring for a PSG1 you would be my hero Or at least a "which wire goes where guide" This wiring has me baffled!

HELP! TM PSG1 Wiring Question.

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