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BryanH
New Member
USA
2 Posts |
 Posted - Nov 18 2010 : 9:26:47 PM
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Sorry if I am posting in the wrong spot,
it's my first day. I have a building that
I help look after[commercial building]
and the issue is that the fire alarm system
that is on the building needs to see 48
volts from the phone system, according to a
fire alarm company that I use with a very
good rep. The phone company says that 41-45
volts, which is what I have is ok. I will
start here as I have more info on this.
My question is the board is 7 years old, and
has had problems for about 5 or 6 according
to someone who has been looking after the
building longer than me. Are the older boards
sensitive to voltage drop 1-3%? Thanks for the
input in advance. |
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Aaron Cake
Administrator
Canada
6718 Posts |
Posted - Nov 20 2010 : 10:22:12 AM
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| It is hard to say without seeing the circuit. It would be reasonable to assume that the circuit should be able to handle the range of voltages present on the phone line. This ranges from about 6-18V when in use, 40-60V when idle, and 90-130V when ringing. |
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KMoffett
Apprentece
USA
23 Posts |
Posted - Nov 29 2010 : 12:07:41 PM
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Time and environment can have a negative effect on some electronic parts. Electrolytic capacitors, connector contacts, switches, relays...
More info ("has had problems" ????), schematics, and photos can help.
Ken |
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BryanH
New Member
USA
2 Posts |
Posted - Nov 29 2010 : 7:36:33 PM
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Pretty sure the board is junk. I think it should
be able to handle the phone company minimum of 41-45.
Thanks for the info guys. |
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Topic |
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Fire Alarm
