help with upgrade n, can't fire the tube

[cgw]

hi folks, help…. i have a k40 which i installed a light objects awc708c upgrade. the steppers work fine but no output from the tube, The laser power supply is a f20150518 kh40W the rest of writing on the supply is in chinese and i do not have a clue what the characters mean. the middle connector has 6pins on the power supply. the fist two pin 1&2 are connected together. pin 3 is connected TTL on laser one , pin 4 is connected to gnd laser one, pin 5 is connected to PWM laser one, and pin 6 is not connected.

The power supply led is on when i try to fire the laser I get no output?. What and how do I check if the AWC708C is working correctly on the laser outputs, Is it a defective power supply, or is it the CO2 tube.

The CO2 laser tube looks ok, no sign of damage, water flow through the tube is ok. no signs of cracks.

The stepper motors and drivers are working fine, They move the head in the proper directions.

[geartech]

Here is the pin out I used for mine, It sounds like you have the same P/S
I have in my k40.
3 connectors,
from left to right
1st is a 4 pin and that is the a/c mains input and laser tube gnd return plug
2nd is a 6 pin that has the safety interlock on pins 1 and 2 then laser fire, gnd, pwm,5v
3rd plug is 4 pin, 24v, gnd, 5v, L ( laser fire )
here is a diagram that I used for mine.
this is from a ramps, arduino conversion but the P/S part is what you need off of it.

[cgw]

attached are photos of the power supply and tube

[gadman58]

I don't have that control so take this with a grain of salt.
I do have that same PowerSupply(PS) so if I visually traced the wires correctly from the photo, looks like it is wired wrong.
TTL is the 3rd terminal from the left on the PS, PWM is the 5th from the left on the PS.
Not sure what WP is but i would think you would want to run a wire over to ground at the 4th from the left on the PS.

Maybe that is what you have hard to see for sure from the photo though.
Another question was it working before the upgrade and is the % power setting above 8% mine won't fire until i get above that.

Glenn
Edit reread your initial sorry looks like you do have that wiring right.

[Tech_Marco]

I have the same though, too
Well, I guess he should take a picture in different angle so that we can see how exactly he wired it up

Marco

[geartech]

It looks like it is right but I cant see where the yellow lead is going in to the connector block.
it should be on that 6 position block front left to right.
1-2 shorted or your safety interlock loop
3 is the L ( laser fire TTL) your blue wire
4 GND yellow wire
5 PWM Grey wire
6 5V+ I used mine to run the current meter
Mine is hooked pretty close to that. I used the L line on the next 4 position over to the right
Pin 4 on that block is also L ( laser fire TTL )

6 position connector block

pin1 interlock
pin2 interlock
pin3 L
pin4 gnd
pin5 PWM
pin6 5V+

4 position block to the right
pin1 24v+
pin2 gnd
pin3 5v+
pin4 L ( laser fire TTL) this is the one I used for mine. try moving yours to here, That is the pin the original controller used for its TTL control line.

tested these for input and control, this should be the pin out for that P/S
Also just check in the setup parameters in lasercad that the laser is set to glass tube and low level effect, read from the controller then check settings
If you need I'll PM you my phone number and I can go thru your connections with you and test if you would like.

[cgw]

pins 1& 2 power supply pink wire jumpered together.
pin 3 power supply blue wire goes to TTL pin4 6.laser one
Pin 4 power supply yellow wire goes to GND pin 5 6.laser one
Pin 5 power supply grey wire goes to PWM pin 3 6. laser one
Pin 6 power supply No connection

no connection on pin 1 5v and on pin 2 wp

no tube response

Laser cad set at glass tube and low level effect

moved the TTL line (Blue wire) over to the power supply third connector (towards the right side facing the power supply) pin #4
Still no response.

[Tech_Marco]

You need to connect WP to Ground. Otherwise, the LPSU is disabled

Marco

[cgw]

Marco
just to clarify connect the WP pin #2 on the DSP to Ground Pin #4 on the DSP for laser one connector
meant pin 5 ground on DSP notPin 4

[gadman58]

Found this while i was looking around: viewtopic.php?f=8&t=2729
Output to LPSU
DSP LPSU
PWM IN
TTL TH
GND GND
WP (either connect to a water chiller sensor or just ground it to GND)

Looks like WP on the DSP needs to go to ground.

Glenn

[geartech]

WP on my 708 isn't grounded and it fires with that setup. there is something else going on here.
I'll take a picture of mine and post it for you but you seem to have it connected correctly from what I can see.
If you have access to a volt meter check to see if the DSP is pulling the L line low when you fire the laser.
It's late her but I'll look over your connections again in the morning and see if there is anything .

One thing you can check real quick, there is a check box above the laser type and level effect marked water protect.
make sure those are not checked.
If they are then you have to have those terminals on the DSP with a path to gnd before it will fire. Or just uncheck them and save it to the controller and reset

[cgw]

Ok this is the current wiring that I have to the power supply

4 position connector left
pin1 to ammeter
pin2 mains GND
pin3 mains line
pin4 mains neutral

6 position connector middle
pin1 interlock connected to pin2
pin2 interlock connected to pin1
pin3 L connected to DSP laser one pin4 TTL
pin4 GND connected to DSP laser one pin5 GND
pin5 PWM connected to DSP laser one pin 3 PWM
pin6 5V+ no connection

4 position block to the right
pin1 24v+ no connection
pin2 GND to ammeter power
pin3 5v+ to ammeter power
pin4 L no connection

Also

DSP laser one pin5 GND connected to laser one pin2 WP

On the software configuration I have the:
laser mode glass tube selected
TTL level low level effective
none of the I/O is selected

checked continuity between connections on the DSP to the LPSU and connections are good.
check continuity to the ammeter and connections are good.
checked power outputs on low voltage side and get the correct readings i.e. 4.98V and 24 volts. checked mains power ok.
checked output on pin 3 TTL signal is high 4.97Vdc when i press the fire button on the DSP unit the level drops to GND 0V



not a whimper on the tube. nada nothing.

have a new power supply ordered from Marco. but I still want to figure out what is wrong.

[geartech]

Ok, you are wired correctly, The DSP is controlling the TTL laser fire line.
What is the min and max power settings on the controller display.
I imagine they are correct but It's pretty much the only variable left.
If I remember correctly there is a test button on the P/S
you should be able to fire the laser with that also just so you can test the P/S
side of things.
You really cant check the high voltage side unless you have the correct test equipment and test
leads as your dealing with many 10's of thousands of volts and one wrong move can either kill or hurt you badly.

One last thing to check, take the ammeter out of the gnd ckt fo the tube and connect the tube ground
directly to the p/s
There is a possibility that it is either open or something else going on with the ammeter.
It's worth a shot.

[cgw]

Final conclusion the power supply went south no power out at all.

Good news The 20W-45W CO2 replacement power supply arrived in this mornings mail, Thanks for the fast shipping light objects…..


now for more questions:

wiring the new supply

3pin connector;

FG mains ground
AC mains line 110V
AC mains neutral 110V

6 pin connector;

H no connection
L connected to DSP laser one pin4 TTL
GND connected to DSP laser one pin5 GND
IN connected to DSP laser one pin3 PWM
5V no connection

on the rear;
White wire to ammeter carhode tube?
Red wire in silicone hose to the anode on the tube

can I use the 5volt and ground to power the ammeter as in my previous set up or would it be better to peer it from another source.

[Techgraphix]

I think it will work fine when you use the 5V output of the LPSU. The GND is on the same level as your supply itself, so I can't think of anything why it should not work..

Kees