Powerware 9120 UPS System Logo
a
andre Posted on Aug 09, 2014

Powerware5115 will not switch on

Not switching on

1 Answer

FlameTorch

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  • Posted on Aug 13, 2014
FlameTorch
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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.

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With the switch in the up position(toward input screws on back) and placing the ohm meter probes; one on the upper left, one on the lower right, continuity is read. Reversing (one lead on upper right, one...

I answer questions for free.
I understand electrical devices.
It is unclear how many screws are on the switch you are testing.

If your switch does not show ohms when the switch is in one position, then it sounds like the switch is bad. But you can read information below for more information about your testing.
You can also add a comment and continue the discussion.

Let me provide more information about switches because you seem interested in electricity and the information may help us understand where the other is coming from in case you add a comment needing more help:
2 screws on switch: (excluding ground screw)
An ordinary single-pole switch usually has 2 brass colored screws.
These screws only read ohms or continuity when switch is in one position.
When the switch is in the other position, there are no ohms that pass through the switch.

3 screws on switch: (excluding ground)
A 3-way switch has 3 screws. There are 2 brass-colored screws and one dark-colored screw.
Put ohm tester on dark screw and continuity will show between the dark screw and one of the brass screws.
Flip the switch and ohms will test between dark colored screw and the other brass screw.

4 screws on switch. (excluding ground)
There are 2 screws on each side of switch.
This type of switch might be a special purpose double-pole switch.
Or it might be the more common 4-way switch.
Add a comment if you have a switch with 4 screws.

Below is a typical 3-way switch application showing the dark-colored screws:
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Here is a typical 4-way switch circuit:
Notice the switch in middle has 4 screws:
b2c1223.jpg

Link below goes to a special application double-pole-double-throw switch:
http://waterheatertimer.org/images/30-Amp-DPDT-switch-a-800.jpg
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