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ats:inteli [2024/06/26 03:13] – [Manual Bypass] Alan Sheaats:inteli [2024/09/21 22:24] (current) – [117 ATS -- Automatic Transfer Switch-Contactor] Alan Shea
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 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)//  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 [[ats:start|ATS Pro & Con]] for reasons why this may or may not be an appropriate choice for your application.// +  * //See the discussion at [[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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 ====Manual Bypass=== ====Manual Bypass===
 +<wrap important>
 +Voltage, frequency, and phase monitoring is inactive while either bypass mode is active! 
 +</wrap>
 +
   * Operating S3, Manual Bypass, forces selection of Utility or Generator power and bypasses InteliATS controls, switching InteliATS to "OFF" Mode.    * Operating S3, Manual Bypass, forces selection of Utility or Generator power and bypasses InteliATS controls, switching InteliATS to "OFF" Mode. 
   * S4 is a 3-position center return selector switch with "ON" and "OFF".   * S4 is a 3-position center return selector switch with "ON" and "OFF".
     * S4 is only enabled when S3 is not in "AUTO".      * S4 is only enabled when S3 is not in "AUTO". 
-    * When S3 is in either "City" or "Gen" bypass mode, it switches On or Off the respective contactor. +    * When S3 is in either "City" or "Gen" bypass mode, S4 switches ON or OFF the respective contactor. 
-  * S3 is mounted inside protective shroud to prevent casual operation+  * S3 is mounted inside a protective shroud to prevent casual operation. 
   * Placing S3 in the City (Utility) disables genset auto-start and K-GC (5)   * Placing S3 in the City (Utility) disables genset auto-start and K-GC (5)
-    * To switch on City/Utility power, momentarily turn S4 to the "ON" position.+    * To turn on City/Utility power, momentarily turn S4 to the "ON" position.
     * To turn off the City/Utility Power, momentarily turn S4 to the "OFF" position.       * To turn off the City/Utility Power, momentarily turn S4 to the "OFF" position.  
 +    * Low voltage from City power will not open contactor K-UC (3) until the voltage falls to approximately 60VAC. 
   * Placing S3 in the Generator position disables K-UC (3), City Power and starts the Generator.   * Placing S3 in the Generator position disables K-UC (3), City Power and starts the Generator.
     * To switch on Generator power, momentarily turn S4 to the "ON" position once generator is up to speed.      * To switch on Generator power, momentarily turn S4 to the "ON" position once generator is up to speed. 
     * To turn off the Generator Power, momentarily turn S4 to the "OFF" position.       * To turn off the Generator Power, momentarily turn S4 to the "OFF" position.  
     * Power to the load will remain OFF until S3 is returned to AUTO, or switched to CITY.      * Power to the load will remain OFF until S3 is returned to AUTO, or switched to CITY. 
 +    * If the generator fails (or runs out of fuel) and the voltage falls below approximately 60VAC, contactor K-UG (5) will open by itself. 
 +      * Allowing this to happen can damage equipment, including the generator diodes. 
  
  
-<wrap important> 
-Voltage, frequency, and phase monitoring is inactive while in either bypass mode is active!  
-</wrap> 
  
  
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 {{page>:warnings&nofooter}} {{page>:warnings&nofooter}}
 +
 +<WRAP center round alert 70%>
 +**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>
 +
ats/inteli.1719371585.txt.gz · Last modified: by Alan Shea

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