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the present situation is :
Guillaume asked me to disconnect the "Laser head" cable from the pump diode module, installed on the optical table.
on the pump diode module, the connector has several small pins and 3 larges pins : A1, A2, A3.
if the diode of the preamplifier (not the ones of the last stage) is alive, the impedance between A2 and A3 should be around 5 ohms and not HiZ.
I checked several days ago the impedance between all these 3 pins to avoid any error on the schematics.
the impedance is always HiZ.
then, Guillaume thinks the diode is dead.
we are waiting for further tests or procedure.
| Ronic Chiche wrote: |
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FYI : to access special menus on the Alphanov software,
login : "Administrator"
pwd : no password
to modify parameters in these special menus :
login : "Alphanov"
pwd : "AE32HF56J"
| Ronic Chiche wrote: |
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Yesterday, we received the controller back from Alphanov
and I tested it immediately in the optical room.
if the software is properly talking to the controller, everything works normally.
then, one just have to remember that is mandatory to have the software properly connected to let the controller start electrically (power supply activated on the main boards)
Today, I installed it in the casemate with all the connections to the laser input, output, laser head, safety connections, etc...
and it works properly.
- The power in the fiber from the strecher is at 6.3mW.
the software reads 5.3mW but after a long fiber... then it is OK.
=> one strange thing : it detects 100MHz instead of 33MHz => to be reported to Alphanov !
- Amplifier output power measured after 2 mirrors :
0% => 230 mW
10% => 880 mW
20% => 8.8W
30% => 17W
which are the numbers we had before.... then we are back to normal conditions to continue the commissioning.
| Ronic Chiche wrote: |
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Today, I did a Teams meeting with Guillaume.
He didn't see any problem with the controller.
normally, the controller will be shipped to the lab tomorrow.
I attach an updated schematic of the internal electronics boards and how they are connected to the PSS.
1- when the black switch button is ON, only the Arduino board, which deals with the software in ON.
2- then, one needs to switch ON the big green button => an internal relay allows the power supply to reach the LAL safety board + Central board + MMD boards but these boards are not powered !
3- then, one needs to turn the key ON => the software can access the Arduino board
4- then, start the software => the white LED of the big green button is ON => all the boards are now powered
depending on the safety signals connected to the controller, it will be possible or not to start the diode supplies (with MMD boards).
the 24V DC coming from an external power supply in replacement of the PSS 24V supply is not mandatory to access the software:
we will only see some buttons (Relai 1 and 2 in the software) to be RED (OFF).
| Ronic Chiche wrote: |
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The laser amplifier controller has been sent yesterday and received today by Alphannov.
they should do the assessment quickly...
| Ronic Chiche w |
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I just tested the fuse inside the black ON/OFF switch on the rear panel => it is OK ! :-(
| Ronic Chiche wrote: |
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on Monday morning 7/11, we tried to restart the Alphanov amplifier which was not turned on since end of april 2022, but it didn't start.
we did a standard "turn ON" procedure :
- check the safety button on the front panel (which has to be released).
- switch on the black switch on the rear panel.
- push the green button on the rear panel
- turn on the key on the front panel
- push the start button on the front panel
normally after switching on the black switch on the rear panel, a light shines in between the red and green big button on the read panel.
but nothing in that case. we just ear a weak "rotating fan" noise coming from the inside of the rack.
normally, after pushing the green button on the rear panel, the start button on the front panel comes to blue.
but nothing in that case.
normally, after pushing the green button on the rear panel and turning the key, the start button on the front panel comes to red.
but nothing in that case.
we tried anyway to connect the amplifier with a computer, just in case of...
but the Alphanov software is not able to connect to the amplifier.
One possible issue could be a dead fuse inside the black ON/OFF switch on the rear panel => one has to check it !
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