MorganG
I'm hoping someone has seen this problem before, or can point me in the right direction in troubleshooting a Generac ATS issue. The ATS is a model #97A02489-W 200 amp, 2-pole unit (Y-Type 62677). It had been working fine, up to a year ago, when it suddenly stopped exercising the generator, and also would not start or transfer to emergency power during a utility power loss. I called our local generator service company, who came out and looked at it, and replaced the Inphase monitor control board, but still could not make the unit work. The original board was part number 92734, Revision F. The "new" board they put in was a 92734, Revision H.

They have worked on the unit on and off several times over the past year, but still cannot make the ATS work. Being a broadcast engineer whose been around these things a lot, and has to make things work to keep radio stations on the air at 2am Sunday morning when a storm has come through, out of frustration, I purchased and installed a new board, #92734 Revision J. The utility voltage monitor LED is on, as is the utility switch position lamp on the front panel of the switch. The exerciser LED (this unit has the standard exerciser option, not the deluxe model) is blinking on and off once per second, as it always has. I can manually start the generator, and the amber "operating" lamp on the front panel illuminates, along with the Minimum Run Timer LED on the in-phase board. It eventually goes out, and the entire inphase board is dark. If I recall correctly, I should at least see a standby run signal LED with the genset running.

The generator is a 45kw natural gas generac unit, which is using the 2-wire start signal from the ATS to engage. Genset output voltages and frequency are right where they should be. There are no other control wires to the ATS. I have verified there is ~20vac coming from TR2 and TR3 when when utility power is on, and 20v coming from TR1 when the genset is running. I have also verified there is approximately 12-15v coming from the sensing coils on 224/225 referenced to wire 227, which supports that the utility monitor board is running correctly. When I installed the new inphase board, I tried to calibrate the utility and standby power levels, but could not get the board to respond (Red LEDs never flash, just one on steady).

My questions are:
1) Are there updated switch settings for the new inphase board, that perhaps supersede my manual (a revision 2 - dated 5/27/94)? I seem to recall from having a similar issue on another ATS many moons ago that there was a slip of paper that came with a new inphase board at that time, which had updated switch settings? There was no such paper in the box with the new board I purchased, so I'm using the switch settings from my manual.

2) Am I missing something obvious here? The internal maintenance disconnect switch IS in Automatic, and I do have Time Delay Neutral enabled, although I have tested the switch both with it enabled and disabled, and it made no difference.

It has been recommended to me by the generator service folks to simply replace the switch entirely with a newer model, but the purchase and install cost is out of sight at this point... Any suggestions would be helpful. Thanks!

-Morgan
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douglas123
Were you trying to calibrate the new control board with the generator running and the maint disconnect switch in the off position. The leds will not persay flash. Turning the correct pot with the switch on the inphase board set to utility or gen the appropriate led should go up and down while turning. Will jumping 178/183 start the genny in auto? PM me for more interesting info. Replacing an older gts is not necessary if all is working well withe the contactor itself. I even repair the contactors. Been doing it over 20 years. Will be glad to help you thru your situation
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MorganG
Thanks for the reply douglas123! No, I had the maintenance disconnect switch in the on position (as I recall, been a few days). I will double-check and try again when I get to the office. Will also try jumping 178/183 and see what happens. I believe the contactor itself is in good condition, simply a logic/controller issue. More info to follow.
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douglas123
Are you testing this transfer switch in the shop ie not connected to a generator and normal utility?
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worahm
What happened to this thread? Did MorganG just stop posting? Would have been nice to know how he resolved his problem. Bill
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Skip Douglas SkipD
worahm;34888 wrote:
What happened to this thread? Did MorganG just stop posting? Would have been nice to know how he resolved his problem. Bill
The last time MorganG checked into the forum was 1 Oct 2014l.
Skip Douglas
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UPS
worahm;34888 wrote:
What happened to this thread? Did MorganG just stop posting? Would have been nice to know how he resolved his problem. Bill


Not unusual in many technical, help, and do-it-yourself forums. Someone new has a problem, asks a few questions, somehow solves their problem, and is never heard from again.
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iflyhelis
UPS;34893 wrote:
Not unusual in many technical, help, and do-it-yourself forums. Someone new has a problem, asks a few questions, somehow solves their problem, and is never heard from again.


I got my problems fixed, I am still here.....

Thanks to all of you guys!
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