Coherent Star C : H/E low reservoir

[nain-nain]

Hello,

A friend has a Coherent Innova Star C (mixed gas). It was working very well until this week. Now, the remote displays "Heat exchanger low reservoir". In the manual, it is said that it's because the reservoir of the optionnal heat excahenger (Water/water exchanger or chiller) is too low.

BUT this laser doesn't have a heat exchanger, it's connected directly to the sanitary cold water, it's open loop. So it shouldn't display this message...

There is a connector named J17 to connect an optionnal heat exchanger to the power supply. This connector is used to power the heat exchanger AND to control the water level in the exchanger. Does someone know the pinout and voltage of this connector ? I could try to put a shunt or the right voltage to inform the power supply that the water level is OK ?

Thank you for your help

[als1980]

It has to have a flow sensor somewhere. When using open loop the water tends to foul up the sensor. If your lucky you can pull it and clean it off. White vinigar in a 50/50 with water works good to get the gunk off.

[nain-nain]

I don't think it because of the water flow rate. There is an other fault if the flow rate is too low (fault messsage "low water flow").

[Vidal Wolf]

The person who would proberly know is DSLi-Jon. Hes a Purelight Guru.

[mixedgas]

The person who would proberly know is DSLi-Jon. Hes a Purelight Guru.

Call/email scientifc laser service @ the Coherent factory. Ask them which two pins the flow jumper goes on, on the external connector.
They will not talk to you unless you give them a head serial number and a psu serial number. They usually will send you a manual in PDF form.

Every Coherent heat exchanger that I've worked on has a contact closure for "cooling valid", and I suspect you need to jump those two pins on the laser.
The data will be in the pdf manual.

Steve

[matratzki]

Hi,
if you open the powersupply you can find the right pinout for the water sensor, you only need to use a wire to connect two pins together
There is also a setting. If your power supply has a build in service eprom, you can put on dip switch number 7 and you can change the setting via remote...

[nain-nain]

Somebody told me that I have to put only the switch n°7 ON to enter in the service mode. I should also put ON only the switch n°7 INSIDE the power supply. Is it right ?

[nain-nain]

The method to go into the service menu with dip switch n°7 worked. The guy changed the settings of the heat exchanger from "Yes" to "No".
But now, there is an other default :"bad autofill cal". Maybe all settings are erased because of a default from the capacitor to store the settings ?

[mixedgas]

Oh, you have 300 series type power supply technology. Not what I thought you had. I've had that on UV midsize argons at work.

IS the power supply the origional one for the head he has?

Bad Autofill Cal is/was bad news on that series. It means the head eeprom no longer matches the tube voltage curve when the PSU runs its self test. You can run the Cal if you have FULL access to service mode ( You may/may not need a service chip) and the right remote, provided your on a very clean source of line power (Not a phase converter). If it won't calibrate after running the service program, the tube pressure needs adjusted by a laser reprocessing company.

It can take 45 minutes to three hours or more of running to calibrate on a 300. I'll have to check my copy of the service manual if I still have it. The 300 procedure will be similar to Purelight but I would be contacting Coherent. You have one generation newer then what I have worked on. I learned this one the hard way after rewindowing and repumping a UV tube myself. I had to run the tube pressure up and down on the pumping station quite a bit before I found where the PSU was happy.

Perhaps Matratzki knows, as I have not worked on your more recent generation. My knowledge is not up to date on this one.

Since I do not have physical acess to the laser, I cannot help you on this one.

Good Luck,



Steve

[nain-nain]

I think that the tube is OK. It worked 2 weeks ago. I think that the problem is from the capacitor that power the EEPROM to store the settings. If the capacitor is broken, all settings are erased and that can explain why we have to change the heat exchanger setting from "Yes" to "No". There wasn't a heat exchanger before...

Is there a manual to install and configure this laser for the first time ? First commissioning with service settings.