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 -0400, 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.
Regards,
Dovid
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 <Brian@ampr.org> 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.
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 -0400, 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.
Regards,
Dovid
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 where people are supposed to be) when both sensors read positive and then have the TDR do its thing when the timer expires. Word of caution though... any system like this needs to have some sort of a reset and bypass in case anyone can actually catch it before it goes down and restore environmentals rather than taking the hard outage since that alone does lots of damage to equipment that has been in place for a good while. You also probably ought to make sure that the present state of said system and its pieces are visible so you can make sure you're going to restart correctly. -Wayne On Mon, May 27, 2019 at 06:20:36PM +0000, Mel Beckman wrote:
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 <Brian@ampr.org> 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.
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 -0400, 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.
Regards,
Dovid
--- Wayne Bouchard web@typo.org Network Dude http://www.typo.org/~web/
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? -- Brandon Ross Yahoo: BrandonNRoss Voice: +1-404-635-6667 ICQ: 2269442 Signal Secure SMS, Viber, Whatsapp: +1-404-644-9628 Skype: brandonross Schedule a meeting: http://www.doodle.com/bross
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 AIR CONDITIONING thermostats. Either method could have been installed; in the computer room I worked in, the EPO was a normally-open circuit that closed when you hit any one of the buttons placed around the room and at the exits. Or indeed, if the fire suppression system triggered. - Brian On Mon, May 27, 2019 at 06:10:49PM -0400, 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 time since I worked with basic circuitry, but wouldn't wiring them in series cause the circuit to be interrupted if EITHER thermostat tripped?
-- Brandon Ross Yahoo: BrandonNRoss Voice: +1-404-635-6667 ICQ: 2269442 Signal Secure SMS, Viber, Whatsapp: +1-404-644-9628 Skype: brandonross Schedule a meeting: http://www.doodle.com/bross
Most EPO “mushroom” buttons can be wired either NO or NC. -mel via cell
On May 27, 2019, at 3:27 PM, Brian Kantor <Brian@ampr.org> 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 are correct, you would want two thermostats that both OPENED when the temperature rose, which would typically be HEATING thermostats, not AIR CONDITIONING thermostats.
Either method could have been installed; in the computer room I worked in, the EPO was a normally-open circuit that closed when you hit any one of the buttons placed around the room and at the exits.
Or indeed, if the fire suppression system triggered. - Brian
On Mon, May 27, 2019 at 06:10:49PM -0400, 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 time since I worked with basic circuitry, but wouldn't wiring them in series cause the circuit to be interrupted if EITHER thermostat tripped?
-- Brandon Ross Yahoo: BrandonNRoss Voice: +1-404-635-6667 ICQ: 2269442 Signal Secure SMS, Viber, Whatsapp: +1-404-644-9628 Skype: brandonross Schedule a meeting: http://www.doodle.com/bross
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
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 Weathergoosen, which close a pair of dry contacts wired in series to the emergency power off contacts for the whole-room UPS. We chose to use two sensors and two dry contact relays to protect against false trips, and thus false shut downs. 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. This protection is for the worst case scenario where nobody responds and the equipment is at risk of damage. We could have commanded an orderly shut down to all servers, but decided that it would be better to kill the power in the event of a runaway heat vent than to try to make it through all the disk activity necessary for a clean shut down. This system has triggered one time, successfully shutting down the data center on a holiday weekend when people missed their notifications, and undoubtedly saved a lot of hard drives. When we got to the room the temperature was over 115°, but the power was cut at 95°. -mel On May 27, 2019, at 11:01 AM, Dovid Bender <dovid@telecurve.com<mailto:dovid@telecurve.com>> 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. Regards, Dovid
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 throttling and/or quiescing may also be ways to reduce load (and thus cooling requirements and heat build up rates) during periods of reduced or completely lost cooling capacity). 1.) Elevated temperature watch at 77 F / 25 C. Send alerts to on-call staff but take no other action. 2.) Elevated temperature warning at 81.5 F / 27.5 C. Begin performance throttling and engage other measures to reduce heat buildup to compensate for insufficient cooling capacity. 3.) Elevated temperature severe warning at 86 F / 30 C. Begin automated clean system shutdowns. 4.) Critical temperature limit exceeded at 95 F / 35 C. Trigger EPO to protect hardware. On sensor redundancy: 3x or higher redundancy allows for voting methods to be used to rule out potential false readings. On series vs parallel wiring: either can be used...what makes most sense depends on the design of the system being integrated with (basically NC vs NO). On Mon, May 27, 2019, 13:18 Mel Beckman <mel@beckman.org> wrote:
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 Weathergoosen, which close a pair of dry contacts wired in series to the emergency power off contacts for the whole-room UPS.
We chose to use two sensors and two dry contact relays to protect against false trips, and thus false shut downs. 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. This protection is for the worst case scenario where nobody responds and the equipment is at risk of damage.
We could have commanded an orderly shut down to all servers, but decided that it would be better to kill the power in the event of a runaway heat vent than to try to make it through all the disk activity necessary for a clean shut down.
This system has triggered one time, successfully shutting down the data center on a holiday weekend when people missed their notifications, and undoubtedly saved a lot of hard drives. When we got to the room the temperature was over 115°, but the power was cut at 95°.
-mel
On May 27, 2019, at 11:01 AM, Dovid Bender <dovid@telecurve.com> 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.
Regards,
Dovid
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 happened to me in Cambridge, MA in the dead of winter and every helpful person in the building came by to suggest I just open windows and doors to the snowy outdoors to get things running sooner. It should be in the specs and if you're concerned about equipment running in too hot an environment you might be concerned about this also. Particularly after a forced power-down which also powers down equipment fans while the chips etc are still hot so will continue heating cases. Ambient air temperature might not be telling you the whole story is the point. I keep one of those big 5' fans, looks like something they use in Hollywood for windstorms and feels a bit like it on high, for just this sort of reason tho even if I just think it's getting warm, and several smaller fans to point at racks etc. The best thing you can do if it gets too hot is keep the air moving. (Where to plug the fans in after a power shutdown is your problem, I knew someone would think that!) -- -Barry Shein Software Tool & Die | bzs@TheWorld.com | http://www.TheWorld.com Purveyors to the Trade | Voice: +1 617-STD-WRLD | 800-THE-WRLD The World: Since 1989 | A Public Information Utility | *oo*
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 platters are made from). Most electronic components can tolerate a pretty steep thermal curve in either direction so long as the curve doesn’t take them out of spec one way or the other. Also, most circuit boards and the like do not have enough mass to surface area ratio to lead to significant temperature differentials within a small physical distance. Owen
On May 28, 2019, at 12:18 , bzs@theworld.com wrote:
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 happened to me in Cambridge, MA in the dead of winter and every helpful person in the building came by to suggest I just open windows and doors to the snowy outdoors to get things running sooner.
It should be in the specs and if you're concerned about equipment running in too hot an environment you might be concerned about this also. Particularly after a forced power-down which also powers down equipment fans while the chips etc are still hot so will continue heating cases.
Ambient air temperature might not be telling you the whole story is the point.
I keep one of those big 5' fans, looks like something they use in Hollywood for windstorms and feels a bit like it on high, for just this sort of reason tho even if I just think it's getting warm, and several smaller fans to point at racks etc.
The best thing you can do if it gets too hot is keep the air moving.
(Where to plug the fans in after a power shutdown is your problem, I knew someone would think that!)
-- -Barry Shein
Software Tool & Die | bzs@TheWorld.com | http://www.TheWorld.com Purveyors to the Trade | Voice: +1 617-STD-WRLD | 800-THE-WRLD The World: Since 1989 | A Public Information Utility | *oo*
On May 28, 2019 at 19:56 owen@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 climates might take their laptops' running disks from a long, frigid walk into a warm building. There was a time when you weren't supposed to move a disk while it was still spinning (e.g., hot swaps had to be able to cut power before removal so you could give the heads several seconds to stop and park), not sure how they solved that so completely, again, laptops.
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 platters are made from).
Also head clearances and other moving parts tolerances.
Most electronic components can tolerate a pretty steep thermal curve in either direction so long as the curve doesn’t take them out of spec one way or the other.
Also, most circuit boards and the like do not have enough mass to surface area ratio to lead to significant temperature differentials within a small physical distance.
Then again if you're cooling a room from, say, 115F to 70F you only need one excuse to consider the rate of cooling and disks would be a pretty good excuse. SSDs no doubt are obsoleting even that concern. But I still tend to worry about the relationship of resistance to temperature in circuits as a general principle tho perhaps in the likely range it's not a major concern. Anyhow, IT'S WORTH A THOUGHT if something extreme happens to temperatures in your machine room. You might not want to fling open the doors and windows of a 110+F room to 0F outside air and begin turning everything back on as the room's air thermometer begins to register 70F a few minutes later. Water condensation can also be a concern, after a prolonged A/C failure it may be hot and humid in the room depending on the climate etc. File Under: MORE THINGS TO WORRY ABOUT!
Owen
On May 28, 2019, at 12:18 , bzs@theworld.com wrote:
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 happened to me in Cambridge, MA in the dead of winter and every helpful person in the building came by to suggest I just open windows and doors to the snowy outdoors to get things running sooner.
It should be in the specs and if you're concerned about equipment running in too hot an environment you might be concerned about this also. Particularly after a forced power-down which also powers down equipment fans while the chips etc are still hot so will continue heating cases.
Ambient air temperature might not be telling you the whole story is the point.
I keep one of those big 5' fans, looks like something they use in Hollywood for windstorms and feels a bit like it on high, for just this sort of reason tho even if I just think it's getting warm, and several smaller fans to point at racks etc.
The best thing you can do if it gets too hot is keep the air moving.
(Where to plug the fans in after a power shutdown is your problem, I knew someone would think that!)
-- -Barry Shein
Software Tool & Die | bzs@TheWorld.com | http://www.TheWorld.com Purveyors to the Trade | Voice: +1 617-STD-WRLD | 800-THE-WRLD The World: Since 1989 | A Public Information Utility | *oo*
-- -Barry Shein Software Tool & Die | bzs@TheWorld.com | http://www.TheWorld.com Purveyors to the Trade | Voice: +1 617-STD-WRLD | 800-THE-WRLD The World: Since 1989 | A Public Information Utility | *oo*
On May 28, 2019, at 21:27 , bzs@theworld.com <bzs@TheWorld.com> wrote:
On May 28, 2019 at 19:56 owen@delong.com <mailto:owen@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 climates might take their laptops' running disks from a long, frigid walk into a warm building.
There was a time when you weren't supposed to move a disk while it was still spinning (e.g., hot swaps had to be able to cut power before removal so you could give the heads several seconds to stop and park), not sure how they solved that so completely, again, laptops.
A big part of solving this was smaller platters. Remember, platters from the time you’re talking about were somewhere between 5.25” diameter and 14” or even 19” diameter in some cases. Platters were usually made of fairly rigid steel and the heads were separated from the platters by air cushions and Bernouli’s principal and very very little else. Today’s disk drives have the heads much closer to the media, but the media is a lot less sensitive to brief head contact. The media is often on thin flexible plastic substrates and the separation of the heads is often purely mechanical. Head insertion and parking mechanisms have changed quite a bit as well, allowing for much sturdier gantries (the head assembly is now usually mounted on a triangular gantry with an arced side where the actuators connect. This allows a significantly larger amount of material to be used in constructing the gantry and the heads travel in an arc across the media instead of in a linear motion as was common in older drives.
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 platters are made from).
Also head clearances and other moving parts tolerances.
Well, the primary thing that’s going to cause you grief for abrupt temperature changes is when the platters warp, resulting in reduced head clearance (possibly even negative head clearance). In the case of some glass platters, shattering will also make for a really bad day.
Most electronic components can tolerate a pretty steep thermal curve in either direction so long as the curve doesn’t take them out of spec one way or the other.
Also, most circuit boards and the like do not have enough mass to surface area ratio to lead to significant temperature differentials within a small physical distance.
Then again if you're cooling a room from, say, 115F to 70F you only need one excuse to consider the rate of cooling and disks would be a pretty good excuse.
SSDs no doubt are obsoleting even that concern.
But I still tend to worry about the relationship of resistance to temperature in circuits as a general principle tho perhaps in the likely range it's not a major concern.
Modern resistors don’t tend to move as much as in the past. However, even for that, as long as you don’t exceed the operating temperature thresholds at either end, you should be fine. The rate of cooling/heating isn’t really an issue for that.
Anyhow, IT'S WORTH A THOUGHT if something extreme happens to temperatures in your machine room.
If you get out of tolerance, then there are lots of things to think about. If you’re within allowed operating range for your equipment, lots less. Rate of change, as I said, is the one that’s unique to disk drives due to the high mass to surface area ratio and the tight mechanical tolerances.
You might not want to fling open the doors and windows of a 110+F room to 0F outside air and begin turning everything back on as the room's air thermometer begins to register 70F a few minutes later.
Yep… If you’ve got spinning media, that’s probably not the best plan. For solid state stuff, it’s probably OK as long as you don’t leave the door open until the room starts to drop below 10ºC.
Water condensation can also be a concern, after a prolonged A/C failure it may be hot and humid in the room depending on the climate etc.
Truth. If you create a new weather pattern inside the datacenter, you’re conducting some form of experiment likely to yield “interesting” results. Owen
File Under: MORE THINGS TO WORRY ABOUT!
Owen
On May 28, 2019, at 12:18 , bzs@theworld.com wrote:
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 happened to me in Cambridge, MA in the dead of winter and every helpful person in the building came by to suggest I just open windows and doors to the snowy outdoors to get things running sooner.
It should be in the specs and if you're concerned about equipment running in too hot an environment you might be concerned about this also. Particularly after a forced power-down which also powers down equipment fans while the chips etc are still hot so will continue heating cases.
Ambient air temperature might not be telling you the whole story is the point.
I keep one of those big 5' fans, looks like something they use in Hollywood for windstorms and feels a bit like it on high, for just this sort of reason tho even if I just think it's getting warm, and several smaller fans to point at racks etc.
The best thing you can do if it gets too hot is keep the air moving.
(Where to plug the fans in after a power shutdown is your problem, I knew someone would think that!)
-- -Barry Shein
Software Tool & Die | bzs@TheWorld.com | http://www.TheWorld.com Purveyors to the Trade | Voice: +1 617-STD-WRLD | 800-THE-WRLD The World: Since 1989 | A Public Information Utility | *oo*
-- -Barry Shein
Software Tool & Die | bzs@TheWorld.com <mailto:bzs@TheWorld.com> | http://www.TheWorld.com <http://www.theworld.com/> Purveyors to the Trade | Voice: +1 617-STD-WRLD | 800-THE-WRLD The World: Since 1989 | A Public Information Utility | *oo*
On 2019-05-27 18:18 +0000, 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 reach our cut-off temperature in about 20 minutes if cooling stops.
This system has triggered one time, successfully shutting down the data center on a holiday weekend when people missed their notifications, and undoubtedly saved a lot of hard drives. When we got to the room the temperature was over 115°, but the power was cut at 95°.
Presumably that was °F, not °C. I have heard from people who did *not* have automatic cutting of the power at high temperatures. Their computer room reached 100°C in places; some keyboards apparently looked like a certain Salvador Dali painting afterwards... (But I think they had very few actual servers or disk drives breaking.) The reason it didn't get even hotter, was that as temperature rose, servers started overheating and shut them- selves down, thus lowering power disippation more and more. Our system for cutting power at high temperatures is part of the PLC monitoring power and temperature in the computer rooms. It sends a signal to the large breakers connecting the power subcentrals (where all the 16A fuses are) to the power rail feeding the room. I believe our PLCs are from Schneider Electric, but anyone who delivers PLCs for controlling power and cooling in a datacenter should be capable or programming their PLCs to do the same. You just need to remember putting it in the specifications when you contract the building. :-) /Bellman
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 oncall, and at 3:30AM I get an alert that the environmental sensors on one of the routers thinks it's too hot. I'm tired and grumpy, and it's only slightly too hot, so I ack it and go back to bed. A short while later I get paged again - another router now thinks it is uncomfortably warm. Still grumpy, so I ack that too, and back to bed. Sure enough, 20 minutes later, another page.... Fine, I get dressed, drive over to the location -- and realize that bricks / mortar are strong in compression, but weak in tension - the AC window units have been quietly vibrating for many years, and the entire row of bricks above the AC units has popped out. All the AC units are lying outside the building on the grass, still running.... :-) I stared at them for a bit, unsure what to do -- so I turned them off, bumped up the monitoring levels, and went back to bed... Next day we blocked up the hole, installed some temporary chillers, and then finally installed real colling.... There isn't much point to this story, but I've got a cold, and wanted to share... :-P W [0]: Wow, I just realized that WUG still exists... huh. On Tue, May 28, 2019 at 9:13 AM Thomas Bellman <bellman@nsc.liu.se> wrote:
On 2019-05-27 18:18 +0000, 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 reach our cut-off temperature in about 20 minutes if cooling stops.
This system has triggered one time, successfully shutting down the data center on a holiday weekend when people missed their notifications, and undoubtedly saved a lot of hard drives. When we got to the room the temperature was over 115°, but the power was cut at 95°.
Presumably that was °F, not °C.
I have heard from people who did *not* have automatic cutting of the power at high temperatures. Their computer room reached 100°C in places; some keyboards apparently looked like a certain Salvador Dali painting afterwards... (But I think they had very few actual servers or disk drives breaking.) The reason it didn't get even hotter, was that as temperature rose, servers started overheating and shut them- selves down, thus lowering power disippation more and more.
Our system for cutting power at high temperatures is part of the PLC monitoring power and temperature in the computer rooms. It sends a signal to the large breakers connecting the power subcentrals (where all the 16A fuses are) to the power rail feeding the room. I believe our PLCs are from Schneider Electric, but anyone who delivers PLCs for controlling power and cooling in a datacenter should be capable or programming their PLCs to do the same. You just need to remember putting it in the specifications when you contract the building. :-)
/Bellman
-- I don't think the execution is relevant when it was obviously a bad idea in the first place. This is like putting rabid weasels in your pants, and later expressing regret at having chosen those particular rabid weasels and that pair of pants. ---maf
On May 27, 2019, at 11:00 AM, Dovid Bender <dovid@telecurve.com> 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) relay. You could trigger it to open the circuit when the temperature is too high. Did a quick google for this and found something to at least explain wtf I’m talking about: https://techtutorialsx.com/2018/02/17/esp32-arduino-controlling-a-relay/ <https://techtutorialsx.com/2018/02/17/esp32-arduino-controlling-a-relay/> -- Landon Stewart Lead Analyst - Abuse and Security Management INAP® 📧 lstewart@inap.com 🌍 www.inap.com
participants (12)
-
Brandon Ross -
Brian Kantor -
bzs＠theworld.com -
Dovid Bender -
Haudy Kazemi -
Landon Stewart -
Mel Beckman -
Nick Hilliard -
Owen DeLong -
Thomas Bellman -
Warren Kumari -
Wayne Bouchard