Question about Zenith ZTG Nema-3R, 400 Amps Three Phase, Automatic Transfer Switch (ZN3NEMA3R400) UPS System

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Zenith ZTX transfer switch, three phase 150 amp

Switch will not tranfer automatically. Generator indicator L E D's on panel are flashing red. Is the switch telling me something with the L E D s flashing?

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  • Jerupaja Apr 13, 2009

    unit in auto,didn't start during power outage



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I suggest to call GE's 24x7 tech support team @ 1-800-637-1738, option # 3

Posted on Nov 08, 2009

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If the s2 and load are flashing every couple of seconds that means your exerciser is set.

Posted on Jan 22, 2009


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Hi Scott,

If this is a newly installed Automatic Transfer Switch (or "ATS"), stop. Call the installer and have them get it working properly. You do not want to start poking around and potentially void the warranty.

If this ATS has been installed earlier and has worked as expected before, and this is the first failure, then we can rule out an improperly connected ATS. I have looked at the manual and see table 9 on page 15 shows a troubleshooting guide. The second condition speaks to the failure to return to utility power due to "T" timer, auto exerciser, or S1 (left-most green LED) power quality / presence issue. It is this last S1 indicator that seems to be the issue. If it is not working, the other green LED (S2) will not light as the ATS will not close the contacts between the Utility and Load. This tends to make me believe the problem lies within the control panel as it is responsible for sensing not only utility power, but performs the synchronization or timing of the transfer of the load from one system or the other. This is needed as generator power is unstable until the generator speed has come up to speed and remains constant. Likewise, the utility sees a huge load when they restore lost power and this can cause some odd waveforms - those that most electronics do not like. Either way, they are power quality issues. Since they are two different systems, it is highly unlikely that they are synchronized. The controller helps to minimize the mismatched waveforms for a smooth transition.

This is a job for qualified personnel. You need to be careful as this system when shut down, might automatically start the generator. If you can't hear it - the potential for shock, burns or even death is present. Be careful - or better yet, call an electrician or the company that performed the installation.

Good luck!

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