Question about Fiskars Brands Power Sentry 100897 UPS System

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3000 VA UPS Service Manaul of Fiskars Power Systems Make

I own a 3000 VA UPS, which is dead and I want to repair it for which need its circuit diagram and service manual. The detail are as under.

UPS : 3000 VA (2100 Watts)
Make : M/s. Fiskars Power Systems, Maxico
Battery : 48 V DC (External)
Input : 220/230 V AC 50 Hz
Output : 220/230 V DC 50 Hz

Make : M/s. Fiskars Power Systems, Maxico
Part No. 05103604-0401
Serial No. A00239421
PCB No. 05141084

If any knows from where to get the circuit diagram and service manual, please be generous to help me out.

Sanjay Sahu
Jamshedpur India
E-mail : sanjaymetro@yahoo.com or sanjay_sahu@aol.in

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  • Anonymous Sep 04, 2008

    i have same problem please suggest

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  • 7 Answers

I have the same PCB on my Deltec PRR2200i. I at least know a few things about the circuit now. I had 11 transistors explode on mine and am replacing them now. Sadly I have not managed to track down a circuit diagram.

Posted on Mar 30, 2010

  • all-is-info Mar 30, 2010

    Oh, I used 2N2907A to replace the drivers Q29-Q32 and STP40NF10L to
    replace the ouput transistors.

    If you look at the 20 output transistors, they're all the same. Mapping
    it out a little shows its a full bridge driver with two totem-pole type
    ouput columns, the primary of the transformer is strung between their
    middles. Further back in the circuit there are two PWM controller chips,
    so I guessed they would be used to switch the stages on and off to
    shape a sine wave - perhaps also using that magnetic sensor thing to
    help, but not sure how.

    In my case, output rows 1 and 2 had blown, indicating they were both
    being driven ON, which should never happen. Over 200 amps straight from
    the battery would fry them in short order. The driver for row 2 (Q29)
    was also fried, and if that leaves row 2 ON, it will short out 50 times a
    second. This is what I think happened, but there are alternative
    scenarious.

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