nanog mailing list archives
Re: Power cut if temps are too high
From: Owen DeLong <owen () delong com>
Date: Mon, 27 May 2019 21:46:43 -0700
On May 27, 2019, at 15:10 , Brandon Ross <bross () pobox com> wrote: On Mon, 27 May 2019, Brian Kantor wrote:A simple air conditioner thermostat wired to the EPO switch. For safety, wire two thermostats in series so BOTH have to trip before power is shut off.Admittedly it's been a long time since I worked with basic circuitry, but wouldn't wiring them in series cause the circuit to be interrupted if EITHER thermostat tripped?
An EPO works by shunting a pulled-up line to ground. If you wire them in series, then the ground has to be shunted to the first segment which is then fed to the ground side of the second switch which until it is closed will not shunt the pulled up line to ground. GND———[contact-closure-1]————[contact-closuer-2]—————EPO Owen
Current thread:
- Power cut if temps are too high Dovid Bender (May 27)
- Re: Power cut if temps are too high Brian Kantor (May 27)
- Re: Power cut if temps are too high Mel Beckman (May 27)
- Re: Power cut if temps are too high Wayne Bouchard (May 28)
- Re: Power cut if temps are too high Brandon Ross (May 27)
- Re: Power cut if temps are too high Brian Kantor (May 27)
- Re: Power cut if temps are too high Mel Beckman (May 27)
- Re: Power cut if temps are too high Owen DeLong (May 27)
- Re: Power cut if temps are too high Mel Beckman (May 27)
- Re: Power cut if temps are too high Brian Kantor (May 27)
- Re: Power cut if temps are too high Mel Beckman (May 27)
- Re: Power cut if temps are too high Haudy Kazemi (May 27)
- Re: Power cut if temps are too high bzs (May 28)
- Re: Power cut if temps are too high Owen DeLong (May 28)
- Re: Power cut if temps are too high bzs (May 28)
- Re: Power cut if temps are too high Owen DeLong (May 28)
- Re: Power cut if temps are too high Haudy Kazemi (May 27)
- Re: Power cut if temps are too high Warren Kumari (May 28)
- Re: Power cut if temps are too high Nick Hilliard (May 28)