It's been 15-20 years,but I believe I've seen these symptoms before.Replacing MPM relay solved the problem.What trips the "starter ckt fault" is too many contactors trying to pull in,when what you have is simply a halt in the process.The motor starts in wye, gets up to speed and amps drop to unloaded condition and chiller sits there waiting for signal from starter to begin loading(and that signal ain't coming).
Man,look at all the talk while i was pecking at the keys.wish I learned how to type.
thank you guys for all the info. i'll be burning up the cell phone lines today
yes, that does (did) happen
Originally Posted by r404a
Nobody has mentioned the end swiches on the vane operator??? If the vanes arent fully closed the chiller will not load . It could be as simple as the arm on the micro switch is bent or the cam on the vane operator needs adjusting .
Also IF and I say IF the chiller has not gone through transition it SHOULD fail on distribution fault ,but that all depends on the black box working properly. You should do yourself a favour and scrap the classic black panel and put the new controller on it .
You wont be able to get parts for it soon its obsolete as of the end of the year .
The 64 roars to life Whoo hoo ...shes a rolling chassis .
You bend em" I"ll mend em" !!!!!!!
I"m not a service tech.. I"m a thermodynamic transfer analyst & strategic system sustainability specialist
Best Austin Healey In Show twice in 2013 .....All those hrs paid off .
Heavy, don't know if you are still looking for the IOM.
Check your email.
haven't spent alot of time on it, been putting out fires elsewhere in the plant. it's tough trying to 'go slow' they even gave me an apprentice to watch over this old fart.
i did check the end switches in the vane motor, and got a resistance across the lchw sensor ( i forgot the value - 3k ohm(?)@ 55 degrees)
in house sparky pulled load wires off starter and locked out. will get into starter when our schedules meet.
thanks for the info, gents. will post more when i know more
Originally Posted by triggerhappy
if you have sg2 in pdf, it would be great if you could shoot me a copy. thanks!
I was saying earlier, I remember a vintage machine like this with an issue starting under a load/tight motor. It could not accelerate, thus amp draw never dropped and transition signal would not be handed down. THE MACHINE NEVER TRIPPED A TRANSITION FAULT but since it did not transition IT WOULD NOT LOAD. Load signal has to go through an aux on the 2k2 or RUN contactor.
Once you get her back wired up, you could really look at the start up amp draw. If the thing is loaded and cant accelerate, well thats an issue. i agree with other guys, you SHOULD get a trip, but I am here to tell you, I seen it happen where we didnt get a fault. Tommorow i will look for notes on this call and touch bases with you on it. r404a
something to look at, but the vane arms are in the closed position. as far as tight, machine rebuilt with new bearings by yours truly abouts 6000 hours ago.
the machine musta spun in an 'start' condition before being noticed for awhile (hours), plus my stand ins spinning it. wouldn't the main blow under a long hi current condition?
i'd better meg the motor while i'm thinking about it.
that being said, how about motor cooling? - or lack of?
i see that they trip at 265, should check if opening circuit will stop the train. no apparent signs or smells of hi temp
I have seen sevaral double enders over the years run in the Y configuration due to not transition.
With the vanes closed they will run for quite a while. If water cooled motor and other machines running.
just wondeing if the yellow current limiting light on the panel is staying lit.
my notes on this same issue you are having , come from a notebook I keep and I am trying to decipher my own notes!
had a similar issue about 3 years ago on a small black panel machine. its gone now, but lets get through your issue.
looks like this machine wouldn't transistion, I did find on the SSOL module at terminals B1 and B2 a resitor with a loose connection, keeping the yellow light (current limit) on at the module.
Also, the module at the main control panel is looking for feed back from the starter. at the same terminals as above, you can get a VDC reading of actual percent of FLA amps.
With chiller off, 0 VDC. At 100 percent FLA, 1 vdc. at 75 percent FLA, .75 VDC
The chiller has to see the VDC drop below .85 (85 percent) to know the chiller compressor has accelerated.
you mentioned something about motor temps. The reason that rang a bell was because this thing also had some temp trip issues. You will get motor cooling due to the refrigerant feed but will inherently run hotter disc temps with IGVs shut.
let us know your progress.
replacing RLY00765 and installing KIT09437 in starter panel. bossman just ordered the retro kit, finally came in late monday. finished wiring today. got trane start up in the morning.
ought to be interesting. worked with the trane dude at another place of employment years ago