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Open cell in the battery.
The batteries need to be replaced, or at least the most bad battery!
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Powerware 9120... | Answered on Jan 26, 2015


Replace the fan ...

Powerware 9120... | Answered on Jan 23, 2015


You need special software, which costs money ...

Powerware... | Answered on Jan 23, 2015


I had a DC bus fault error displayed.

So I unplugged battery, then turned on UPS. It said Batt disconnected of course.

So when I plugged in the batt while the UPS was on, and held the power button for a few sec, the UPS displayed Batt testing.

After a few moments it was back online and had no faults!

Worth a shot.

Powerware 9120... | Answered on Nov 04, 2014


Check the connections on the batteries. One or more may be loose or corroded. Also check the fuse for the batteries. It may have blown.

Powerware 9120... | Answered on Sep 29, 2014


When you are sure you have a good battery and the voltage regulator works fine, I should think there is something eating power during the time you switched off. Years and years ago sometime a car radio was connected wrong and would not switch off when the contact was off. Now you should disconnect the battery when you switched of and use a huge ampere meter DC to see if and if so what current is "leaking" away If there is no current, then check the barrery and the voltage regulator.

Powerware... | Answered on Sep 23, 2014


Be more specific. Exactly what do you see?

Powerware 9120... | Answered on Sep 11, 2014


M-PW9120 6000i protection diode is damage when we connect the ups with main source otherwise backup is ok only protetion diode is damage

Powerware 9120... | Answered on Aug 29, 2014


Hi Anonymous,
I want to help you with your question, but I need more information from you. Are the batteries new? If you did recently replace the batteries in the cartridge, did you check the connections and make sure contact as being made?

Let me know!

Daniel • daniel@psihq.com • Power & Systems Innovations • 800.260.2259 • www.psihq.com

Powerware 9120... | Answered on Aug 25, 2014


A weak or dead battery pack its the main reason of a unresponsive/good health UPS, but never forget to test the electric cord, the fuse and the protective relay.first, this sounds too simple, but thats a common fault.

Battery pack must have at least 5 volts with half amp of current to power up the UPS internal relays, giving electric power to the main switch.

To rise the 12/24 DC volts to 115/120 AC volts, the UPS uses some electronic components (semiconductors) called MOSFETS , and sometimes, blown (browned) MOSFETS on the electric board are the most desastrous cause of a unresponsive (completely dead) or faulty UPS. (I remember that some time ago I see a TRIPP LITE SMART 1500LCD UPS with twelve blown MOSFETS, when happened, that kind of fault must be saw like a little volcano!).

If you know how to take all the safety electric measures, and how to use a portable voltmeter, you can test the voltage/amperage on the battery pack, the electric cord and the replaceable fuse (if has any). Basic and intermediate electronic knowledge is necessary to test MOSFETS and other electronic components on the circuit board.

Powerware 9120... | Answered on Aug 13, 2014


If your batteries are ok a DC BUS fault and low o/p voltage means one of the componants inside is defective. An end user can not effect repair. You need to have it looked at.

Powerware 9120... | Answered on Jul 18, 2014


powerquality.eaton.com/support/Contact-Tech-Suppor...

Powerware 9120... | Answered on Jul 08, 2014


A Bosch 70745 is a cordless tool; the battery recharges with a power pack, or a plug in charging station. This is not a UPS Battery Backup system.

Powerware... | Answered on Jun 27, 2014


Batteries are connected in series on your PW9120-1000. Connect the battery farthest from the end that faces the front display of the UPS with the incoming red wire to the red terminal on that battery. Connect the short cable from the black terminal on on that battery to the red terminal on the next battery (these batteries will face each other, but one set of terminals will be at the top and the other set will be at the bottom). Connect the longer wire from the black terminal of the second battery to the red terminal of the last battery (which will face opposite the 2nd battery). The black terminal on the last battery will connect to the thick black wiring coming in from the rear of the battery case.

Powerware 9120... | Answered on Jun 16, 2014

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