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======Auto Mains Fail Transfer Switch :: ComAp Inteli-ATS====
{{ ::zref:ats:inteliats2_70_main.jpg?direct&300|}}
This automatic transfer switch uses a [[https://www.comap-control.com/products/switchgear-control-and-protections/ats-controllers/|ComAp ATS Controller]] combined with motor contactor switching to provide a fully-featured ATS with full metering & history logging, and can also be remotely monitored. 
  * [[https://www.comap-control.com/products/switchgear-control-and-protections/ats-controllers/inteliats2-50/|InteliATS 50]] 
  * [[https://www.comap-control.com/products/switchgear-control-and-protections/ats-controllers/inteliats2-70/|InteliATS 70]] adds PLC logic blocks

====Motor Contactor Selection==
The appropriate size of motor contactors should be selected based on the load served and the genset size. The 400A frame is a good general purpose selection, but smaller or larger can substituted. Recommended source: [[https://www.factorymation.com/Contactors_Overloads_qs/Metasol-Contactors-Overloads-9-to-800A?Coil_Voltage=240V-AC-Class&Nominal_Amps=150,225,400,800|FactoryMation.com]] //(225A frame and larger have 100-240VAC/DC coils)// 

  * //See the discussion at [[:zref:ats:start#contactor-based-atspro-con|ATS Pro & Con]] for reasons why this may or may not be an appropriate choice for your application.// 

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**See warnings below** 
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=====One-Line Diagram===
{{::zref:ats:e117.1_r1.1_auto_transfer_switch_inteliats.png?direct&600 |}}

===Auto Mains Fail Transfer Switch==
<WRAP col2>
One-line diagram, detailed schematic/wiring diagram, and parts list:
  * {{ ::zref:ats:e117.1-3_r1.1_auto_transfer_switch_inteliats.pdf |}}
  * {{ ::zref:ats:e117.1-3_r1.1_auto_transfer_switch_inteliats.dsn |}}
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//(DSN) files can be edited with [[https://www.metatek.org/tinycad|TinyCAD]].//
</WRAP>
=====Description of Operation===
Contactors K-U [3] and K-G [5] are mechanically and electrically interlocked to ensure that only one can be closed at a time. 

===Definitions==
  * **Utility Connected:** Two Green indicators (L-U, L-KU)
  * **Generator Connected:** Two Blue Indicators (L-G, L-KG)
  * **Load Connected:** White Indicator(s) (one per phase, if desired)
  * **K-G [3], K-U [4]**: Utility & Generator Power Contactors, 400 Amp 3-pole

====Utility Power Failure==
  - Starting with Utility Power being supplied to the load: Contactor K-U [3] is closed, and all timers have expired.
  - Power is removed from the coil for K-U [3] if: 
    - Utility power fails
    - Voltage on any phase exceeds minimum or maximum voltage setpoint.  
    - Frequency exceeds minimum or maximum setpoint
    - Phase rotation is reversed
  - When K-U [3] opens: 
    - Load is disconnected (Preventing damage to equipment caused by low voltage.) 
  - If utility power fails to return within 5 seconds: 
    - InteliATS closes KGS [6] to start the genset
  - Once the generator is running, the Inteli:zref:ats: 
    - Qualifies input for minimum, maximum voltage on all phases, correct phase rotation, minimum, maximum frequency
    - Illuminates L-G (Blue) indicating generator power is OK.
    - Begins countdown (5 seconds). 
  - K-G [5] then closes: 
    - Supplies generator power to the load
    - Opens the neutral connection for the coil on K-U [3], preventing K-U [3] from closing by accident. 
    - Illuminates L-KG (Blue) indicating that generator is supplying the load. 

====Utility Power Return==
  - When Utility Power returns, Inteli:zref:ats: 
    - Qualifies input for minimum, maximum voltage on all phases, correct phase rotation, minimum, maximum frequency
    - Indicator L-U (Green) illuminates to confirm utility grid voltage is acceptable
  - Begins time delay (15 minutes), which ensures:
    - The utility grid has time to stabilize
    - Delays adding loads to the grid after an outage
    - Eliminates short-cycling if the grid drops again shortly after returning
    - Provides a minimum run-time for the generator to ensure it gets up to operating temperature
  - Opens the coil for K-G [5]: 
    - Disconnects load from Generator
    - Connects neutral of K-U [3] coil
  - K-U [3] closes after setpoint time-delay (as short as 1mS)
    - Connects load to Utility Grid
    - Disables K-G [5] by disconnecting neutral of coil
    - Illuminates L-KU (Green), indicating Utility/Grid is supplying load
  - Begins time delay (2 minutes) for Generator cool-down (running with no load)
    - Opens KGS [6] to disconnect the generator auto-start signal 
    - Genset stops

====Manual Bypass===
  * Operating S2, Manual Bypass, forces selection of Utility or Generator power and bypasses InteliATS controls
    * S2 is mounted inside protective shroud to prevent casual operation
  * Operating S1, Auto/Gen, forces selection of Generator by InteliATS
    * InteliATS will start generator, qualify power, then turn off K-U [3] and turn on K-G [5] after setpoint delay (as short as 1mS). 
  * Switching S1 back to Auto will switch back to Utility power if it is qualified based on normal setpoint limits. 

====Emergency Stop=== 
  * Operating the Emergency Stop (E-Stop) mushroom switch immediately disconnects all power sources and shuts down genset, if it is operating. 
  * The E-Stop must be turned clockwise to release the latched condition, and the alarm reset on the InteliATS in order to return to normal operation. 


=====Bill of Materials==
**//[Incomplete, work in progress]//**
====117 ATS -- Automatic Transfer Switch-Contactor===
  * [[https://docs.google.com/spreadsheets/d/1r8JlMTjobZA3-YeLz29EerO8OxSNKXO5SXB6vngvN9Y/edit?usp=sharing|BOM 117 -- Google Sheets]]
  * [[https://docs.google.com/spreadsheets/d/e/2PACX-1vTpnSXQxSW-pyEPUDI_RqkSWwlRZ5bm6xUZVdUwxoYJp45-My7mLLED89SG-gxo4DX0bJ0KjPFYXsjP/pubhtml?gid=0&single=true|BOM 117 -- Web Page]]
  * 


<html><iframe width="950px" height="600px" src="https://docs.google.com/spreadsheets/d/e/2PACX-1vTpnSXQxSW-pyEPUDI_RqkSWwlRZ5bm6xUZVdUwxoYJp45-My7mLLED89SG-gxo4DX0bJ0KjPFYXsjP/pubhtml?gid=0&amp;single=true&amp;widget=true&amp;headers=false"></iframe></html>

{{page>:warnings&nofooter}}

<WRAP center round alert 80%>
**DANGER:** Current transformers must be connected to a device, or short-circuited before power is applied in the circuit to be measured. Current transformers are //constant current// devices, not //constant voltage// like ordinary transformers. 

  * **A C.T. with loose leads can have lethal voltage on the terminal, possibly over 1000V.** 

  * **Do not disconnect a C.T. when power is present in the measured circuit!** 
</WRAP>
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