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Thread: York YS Chiller Ground Fault
07-10-2009, 06:08 PM #14
More than likely it the driver board. Hardly ever do the hockey pucks go bad. You can test then with a 9 volt battery. You just need to forward bias the scr to see if it conducts. There are instructions on how to test phase control scr's on the net. It takes more than what a meter puts out though. They are actually a network of scr's to handle the current.
07-12-2009, 09:15 PM #15
Before I started on the troubleshooting the L3 upper trigger section caught my eye (2nd from the right) in the wide photo.
The other two photos are closeups of the L3 lower and upper trigger sections (good vs. bad).
I'm really confident that's the problem but I started through the troubleshooting flow chart anyway with the motor disconnected because the GFI breaker won't let it start for any more that .4 seconds.
All the tests up to page #28 were good but when I got to the part that the motor has to start, I'm stuck except the only 2 possible outcomes to any of the tests are "Replace SCR Assy" or "Replace Trigger Board".
I'm ordering a Trigger Board and we'll see if I also have a faulty SCR...
07-12-2009, 11:59 PM #16
r-87 definitaly does look like it could have gotten hot before. However they do run pretty hot. I think that is a shunt resistor to contril the gate current on the scr. It could be holding the scr on but it would be a phase fault or a half phase trip. I think that the big GFCI's will treat a half phase conduction as a ground fault. Good luck on this one. However in your defense if there is a bad scr brick they will usuallt\y take the driver board out also. Try to find someone that repairs these new inverter welders and se if they have an scr tester to test out the pucks before you try the new driver board. I may have an old one in the storage is you want to test it out first. It is of no use to me. I would not trust it for anything but testing. I will look. I will send you my contact info by e-mail. Call me around 9 am CST.
07-13-2009, 12:26 AM #17
07-16-2009, 03:35 PM #18
The the burned trigger had no output
The SCR's ohm'ed good so I ordered a new trigger board.
Installed it today and the machine purrs like a kitten.
Thanks again to all!
07-17-2009, 09:14 AM #19
07-17-2009, 10:45 AM #20"Quality exists, when the price is long forgotten."
07-17-2009, 08:32 PM #21
you got that right. The coolant used in the ycav and the yciv is a glycol base. Under no circumstances should anything else be added. I have heard of people using dexcool in it. From what I was told it will cause permanent damage to the pump seal and the o-rings inder the IGBT's. I have had some problems with bacteria growing in the SSS coolant loop. The only thing that I found that will kill it is a Benzalkamonium chloride disenfectant Or even easier to get, Waterbed conditioner. Run it for about 20 minutes. Vacume it out and flush it with DI water (several times) and then fill it up with coolant. Everyone had told me to use antifreeze to kill it. It wont. Usually comes back in 2 months. The disinfectant works great and it will not attack any of the plastics or any of the metals.
12-14-2012, 11:52 AM #22New Guest
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