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

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Zenith mx 100 hangs up on retransfer,stays in neutral position

The switch starts the genset,it transfers ok but when utility returns the switch gets stusk in neutral,ive cleaned the relays in the rt box,ive cleaned and even replaced the micro switches but problem still happens once and a while-not everytime.

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Call GE Zenith 24x7 tech support team @ 1-800-637-1738, option # 3
www.gedigitalenergy.com/pq

Posted on Nov 08, 2009

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No output


You should start with Rotary switch on "Maintenance Bypass" position and Qf1 open.
Turn Rotary Sw to "Test" position and wait for self test to execute and UPS to turn on.
Once you get the Yellow lamp lit, it is asking for QF1 to close
Once closng QF1, if green LED is lit, turn UPS off by pressing gray button until it ask for confirmation, select Yes and press Return.
Turn Rotary Sw to Normal position, press On button and the green LED will illuminate.
If, after closing QF1, the green LED didn`t lit, turn Rotary Sw to Normal, press On button and wait for green LED to lit.

Thats`it...
if anything is not working well.. please let me know.

Mar 25, 2014 | MGE UPS Galaxy 3000 UPS System

1 Answer

Is transformer of my UPS OK?


The rectifier (Full or 1/2 wave) is not producing normally: as applied under a normal load. My take!

Mar 14, 2014 | UPS Battery Backup Systems

1 Answer

When switched the bypass to normal position, voltage failed through the unit; however the QB3 position gives output voltage


You didnt start the UPS correctly because the static switch was not on. The Static Switch has to be on to get a clean transfer of power. Check your static switch

Sep 14, 2011 | MGE Galaxy 3000 UPS System

1 Answer

How do you calculate low phase voltage of a three phase four wire system without useing voltmeter?


u can take three incadescent bulbs of same rating, connect them in 3 phase star connection, means 3 phase 4 wire connection..connect it across supply..the bulb connected across low voltage phase will glow dimmer than other two

Jun 19, 2010 | Zenith ZTG Nema-3R, 400 Amps Three Phase,...

1 Answer

The unit beeps


I am getting these directly from the user manual (available here: http://www.apcmedia.com/salestools/ASTE-6Z7VAQ_R3_EN.pdf)

Issue: On Battery - UPS is supplying battery power to the load connected to the Battery outlets.

Visual Indication: Power On LED - ON (off during beep)

Audible Indication: Beeping 4 times every 30 seconds

Stops When: UPS transfers back to Power On operation, or when UPS is turned off.

- OR -

Issue: Sleep Mode - During On Battery operation the battery power has been completely exhausted and the UPS is waiting for utility
power to return to normal.

Visual Indication: None

Audible Indication: Beeping once every 4 seconds

Stops When: Utility power is restored, or if utility power is not
restored within 32 seconds, or the UPS is turned off.


All other issues are CONSTANT tones, which you did not specify, or there are no audible tones associated with it.

Apr 07, 2010 | APC Back-UPS ES 350 - UPS ( external ) -...

1 Answer

How to solve single phase lost in UPS at input end


What size UPS and make and model?

First make sure your utility is reaching the UPS and it's not on that end, sounds like the problem might be with your input power not the UPS.

If power is getting to the unit, you may have a failed power component internally, such as a fuse or transistor.

Nov 05, 2009 | Zenith ZTG Nema-3R, 400 Amps Three Phase,...

2 Answers

APC UPS issues


If its really a noise? neutral and ground of your utility power (building transformer) should be bonded

Apr 14, 2009 | APC Back-UPS ES 350 - UPS ( external ) -...

2 Answers

Zenith ZTX transfer switch, three phase 150 amp


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

Oct 03, 2008 | Zenith ZTG Nema-3R, 400 Amps Three Phase,...

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