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cp:ats [2022/10/26 01:11] – Alan Sheacp:ats [2024/04/29 18:33] (current) – Alan Shea
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 ===Pro & Con=== ===Pro & Con===
-Generator transfer switches using industrial motor-control contactors have the advantage of simplicity and long-life, typically rated for over 500,000 operations at rated load. They also use standard off-the-shelf components that can be purchased almost anywhere. +Generator transfer switches using industrial motor-control contactors have the advantage of simplicity and long-life, typically over 500,000 operations at rated load. They also use standard off-the-shelf components that can be purchased almost anywhere. 
  
 The primary disadvantage is that they do not meet National Electrical Code requirements in the United States for Automatic Transfer Switches for emergency and legally required standby power use. They do not satisfy the two requirements of NEC [700.5(C)] and [701.5(C)] (2011):  The primary disadvantage is that they do not meet National Electrical Code requirements in the United States for Automatic Transfer Switches for emergency and legally required standby power use. They do not satisfy the two requirements of NEC [700.5(C)] and [701.5(C)] (2011): 
   - They are not manufactured as Automatic Transfer Switches (ATS) or approved by a testing lab for emergency power system use.    - They are not manufactured as Automatic Transfer Switches (ATS) or approved by a testing lab for emergency power system use. 
-  - They are not mechanically held.((See [[http://www.mikeholt.com/download.php?file=PDF/11_Generators_and_Standby_Power_Systems.pdf]]))+  - They are not mechanically held.((See [[https://web.archive.org/web/20210315105023/http://www.mikeholt.com/download.php?file=PDF/11_Generators_and_Standby_Power_Systems.pdf|http://www.mikeholt.com/download.php?file=PDF/11_Generators_and_Standby_Power_Systems.pdf]])) 
 Optional Standby systems as defined in [702.4] are not bound by these legal requirements for transfer switches.  Optional Standby systems as defined in [702.4] are not bound by these legal requirements for transfer switches. 
  
-The biggest disadvantage of an ATS is that the contacts are typically rated for less then 5000 transfers at rated load, at which point the contacts must be replaced, and frequently the electro-mechanical actuator as well. In locations where electric power is reliable, this is typically not an issue as 5000 transfers will take several decades to accumulate. In locations with unreliable power this number of transfers can be accumulated in just a few years. +The biggest disadvantage of a packaged ATS is that the contacts are typically listed for a maximum of 5000 transfers at rated load, at which point the contacts must be replaced, and frequently the electro-mechanical actuator as well. In locations where electric power is reliable, this is typically not an issue as 5000 transfers will take several decades to accumulate. In locations with unreliable power this number of transfers can be accumulated in just two or three years. 
  
 An ATS is also physically large compared to a set of contactors, which can otherwise be carried in an airline suitcase. That in particular makes this design more suitable for remote locations, as the parts can be carried in and assembled on location in a short time.  An ATS is also physically large compared to a set of contactors, which can otherwise be carried in an airline suitcase. That in particular makes this design more suitable for remote locations, as the parts can be carried in and assembled on location in a short time. 
 +
 +===Alternative Controller=== 
 +{{ :cp:inteliats2_70_main.jpg?direct&200|}}
 +As an alternative to the relay logic depicted below, a [[https://www.comap-control.com/products/switchgear-control-and-protections/ats-controllers/|ComAp ATS Controller]] combined with the contactor switching provides an ATS with full metering & logging, and can also be remotely monitored. 
  
 ===One-Line Diagram=== ===One-Line Diagram===
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 <WRAP col2> <WRAP col2>
 ==Auto Mains Fail Transfer Switch== ==Auto Mains Fail Transfer Switch==
-  * {{ :cp:e116.1-3_r4.1_-_transfer_switch.pdf |}} +  * {{ :cp:e116.1-3_r4.1_-_transfer_switch.pdf |E116.1-3 r4.1 Transfer Switch (PDF)}} 
-  * {{ :cp:e116.1-3_r4.1_-_transfer_switch.dsn |}} +  * {{ :cp:e116.1-3_r4.1_-_transfer_switch.dsn |E116.1-3 r4.1 Transfer Switch (DSN)}} 
-\\ +
 ==Auto Mains Fail Transfer Switch -- Selector Switch== ==Auto Mains Fail Transfer Switch -- Selector Switch==
-  * {{ :cp:e116.1-3_r5.2_auto_transfer_switch_selector.pdf |}} +  * {{ :cp:e116.1-3_r5.2_auto_transfer_switch_selector.pdf |E116.1-3 r5.2 Transfer Switch (PDF)}} 
-  * {{ :cp:e116.1-3_r5.2_auto_transfer_switch_selector.dsn |}}+  * {{ :cp:e116.1-3_r5.2_auto_transfer_switch_selector.dsn |E116.1-3 r5.2 Transfer Switch (DSN)}}
 </WRAP> </WRAP>
 +//(DSN) files can be edited with [[:TinyCAD|]].//
  
 ====Description of Operation=== ====Description of Operation===
cp/ats.1666746712.txt.gz · Last modified: 2022/10/26 01:11 by Alan Shea

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