Re: Power cut if temps are too high

> On May 28, 2019, at 21:27 , b...@theworld.com wrote: > > > On May 28, 2019 at 19:56 o...@delong.com (Owen > DeLong) wrote: >> It’s unlikely to apply to much of anything in a datacenter other than disks. > > Ok, disks, a mere bagatelle of a concern. > > Then again

Re: Power cut if temps are too high

On May 28, 2019 at 19:56 o...@delong.com (Owen DeLong) wrote: > It’s unlikely to apply to much of anything in a datacenter other than disks. Ok, disks, a mere bagatelle of a concern. Then again obviously disks have gotten much, much better about thermal change since people in, e.g., temperate

Re: Power cut if temps are too high

It’s unlikely to apply to much of anything in a datacenter other than disks. The reason it applies to disks is because rapid cooling of a drive will lead to uneven cooling of the platters which may cause abnormal stresses leading to shattering and/or warpage (depending on the material the drive

Re: Power cut if temps are too high

Something to keep in mind is that some equipment, disks in particular, should only be cooled at a certain rate once they're hot, often annoyingly slow by the specs like 2-3 degrees C per hour but there are probably circuits sensitive to this also which could be anywhere. It came up because it ha

Re: Power cut if temps are too high

On May 27, 2019, at 11:00 AM, Dovid Bender wrote: > > Hi, > > Is anyone aware of a device that will cut the power if the room goes above X > degrees? I am looking for something as a just in case. I would personally make one with an ESP32 (micro controller with wifi) and a (normally closed) re

Re: Power cut if temps are too high

Warren Kumari wrote on 28/05/2019 14:45: There isn't much point to this story, but I've got a cold, and wanted to share...:-P whoever brought this cold to the RIPE meeting and infected a bunch of us has a lot to answer for, damn them. :-( Nick

Re: Power cut if temps are too high

I used to work for a small, fairly crappy ISP -- the "datacenter" was a converted brick garage / loading dock. In order to provide cooling, they had chipped out a bunch of bricks, and mounted in 8 or so AC units, all in a line. We monitored everything with WhatsUp Gold[0] - one (hot) night I'm onc

Re: Power cut if temps are too high

On 2019-05-27 18:18 +, Mel Beckman wrote: > Before the trigger temperature is reached, the NMS would have sent > various escalating alarms to on call staffers, who hopefully would > intervene before this point. Would they actually have time to react and do something? In our datacenters, we r

Re: Power cut if temps are too high

Time Delay Relays are available with fixed or variable settings. if you're going the mechanical approach vs scripted monitor and SNMP sort of trigger, you can use this to cause a standard relay or SCR to trip to raise the alarm (and hopefully also flash a warning light and/or audibly sound an alert

Re: Power cut if temps are too high

> On May 27, 2019, at 15:10 , Brandon Ross 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 tim

Re: Power cut if temps are too high

Where granular temperature readings are available to control scripts, it would also be possible to implement something like the tiers described below. Adjust thresholds as deemed appropriate for the facility and equipment, and also for the expected rates of temperature rise. System peformance throt

Re: Power cut if temps are too high

Most EPO “mushroom” buttons can be wired either NO or NC. -mel via cell > On May 27, 2019, at 3:27 PM, Brian Kantor wrote: > > I was assuming the EPO trigger is a circuit that is normally OPEN > and is closed when the button is pushed. > > If instead, it is a normally-CLOSED circuit, then you

Re: Power cut if temps are too high

I was assuming the EPO trigger is a circuit that is normally OPEN and is closed when the button is pushed. If instead, it is a normally-CLOSED circuit, then you are correct, you would want two thermostats that both OPENED when the temperature rose, which would typically be HEATING thermostats, not

Re: Power cut if temps are too high

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 ser

Re: Power cut if temps are too high

We considered this approach, but we wanted to have notifications precede shut down, and give a remote support person the ability to prevent the shut down. Our SNMP based system gives us that option. -mel > On May 27, 2019, at 11:16 AM, Brian Kantor wrote: > > A simple air conditioner thermo

Re: Power cut if temps are too high

We use Intermapper, an SNMP network monitoring system, which supports UNIX scripting. Intermapper probes two Weathergoose temperature sensors, and calls a script with the values it retrieves. When both sensors exceed a certain threshold, the script sends an snmp relay trip signal to the Weatherg

Re: Power cut if temps are too high

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. Note that the EPO rarely does an orderly shutdown, but then this is a sort of an emergency. - Brian On Mon, May 27, 2019 at 02:00:39PM -0

Power cut if temps are too high

Hi,Is anyone aware of a device that will cut the power if the room goes above X degrees? I am looking for something as a just in case.