jb@terak.UUCP (John Blalock) (06/26/85)
*** REPLACE THIS BUG WITH YOUR LINE ***
Summertime and the summer showers and power outages are almost here again.
Most of us use the standard surge and/or transient suppressors to protect
our systems from power line problems, but I also recommend use of the
following circuit:
ANTI-APS CIRCUIT
AC HIGH
/ Main Switch ----------O------------->
,----o/ o-----------------------o-----------/\ TO SYSTEM
o S1 |
(_ Main | ----------O-,
F1 ) Fuse ,--------o-----------/\ |
o | ,-------------------'
| Momentary |_o S2 | -------
To 120 | Start | o o------| | 120 VAC DPST-NO
VAC | Switch | | | K1 | RELAY
_ HI| '------------' | |----.
-| \---' ------- |
=| |---|> Chassis Ground | AC NEUT
-|_/---------------------------------------------------------o------------->
NEUT TO SYSTEM
Closing S1 does not turn on AC to the system, it just enables the circuit. Once
S1 is closed, closing momentary switch S2 energizes K1. One set of contacts
on K1 provides AC to the system, the other contacts are in parallel with S2 and
latch K1 on until S1 is opened or the main AC source goes off momentarily.
You need this circuit if you have a "public utility" known to have frequent,
unpredictable, power outages. If there is a momentary power failure, your
system will shut down until you restart it by pressing S2. This prevents
frequent up/down AC surges like we see in Phoenix from being seen by your
system. Make sure that the current ratings of F1, S1, and K1 exceed your
requirements.
John Blalock, W7AAY
uucp: ...{amd,decvax,hao,ihnp4,seismo}!noao!terak!jb
phone: (602) 998-4800
us mail: Terak Corp., 14151 N. 76th St., Scottsdale, AZ 85260
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