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I HAVE A POWERWARE 9120 MODEL NO PW9120-3000I UPS FOR SINGLE PHASE OUTPUT OF 230 VAC. RECENTLY I HAD REPLACED WITH NEW SET OF BATTERIES. NOW IT IS SHOWING " DC BUS UNDER VOLTAGE " IN UPS DISPLAY. PLEASE SUGGEST WHAT TO DO FURTHER TO RECTIFY THE SAME OPERATE UPS SMOOTHLY.

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Check your DC bus fuse. I have a manual if you need one. Email me at ericpettingill@hotmail.com

Posted on Sep 20, 2011

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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

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Step 2. If step 1 cleared the alarm try distributing the decives across the outlets differently.

There are two inverters so two output if everything is plugged into one side (ie a power bar with 10 things plugged into it) and nothing on the other side this could cause the alarm.

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did u check the fuse inside the ups?
did the ups gave the error right after u replace the batteries? or some time after.
sometimes gives the message some time after and its because the charger isn´t working properly. the charger is a spare board in the 9120, 5 and 6 KVa.
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