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External Alarm

PostPosted: Sun Feb 12, 2012 3:22 am
by sammaz
Hi, I have an APC ESP monitor. The alarm is faint and I can hardly hear it. I was wondering if there's a way to connect an external buzzer. If so, how? Thanks

Re: External Alarm

PostPosted: Sun Feb 12, 2012 5:34 pm
by Coulomb
The wiring diagram shows on connected between 2-2, (power) and 2-6, the negative for the beeper. Use the #2003 beeper.

Do not turn power off on the ESP. That unit is about 17 years old and the menu system is stored in volatile memory backed up with a battery only good for 10 years.

Re: External Alarm

PostPosted: Mon Feb 13, 2012 12:06 pm
by sammaz
yes, the unit is old but still works perfectly!
- Can I replace the battery? if so how and what battery is required?
- The manual does not have a wiring diagram. Is there one on the web somewhere I can look at?
- I did not fully undestand your instructions: should I connect the alarm to 2-2 and 2-6 leads?
- I was planning on using a standard 12v buzzer. Is that OK? I don't know what #2003 is.
Many thanks.

Re: External Alarm

PostPosted: Mon Feb 13, 2012 3:41 pm
by Coulomb
The internal battery is part of the static ram chip, and is not replaceable. The chip is no longer made, and the system for loading the menu into the ram is no longer functional.

The #2003 is a piezo electric device with a low current draw. It is available from Ample Power.

A standard 12V buzzer will probably overheat the transistor and fry.

TB2-6 connects to the negative side of the beeper. The positive side of the beeper connects to +12V, available on TB2-2.