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--- ats:inteli [2024/06/18 15:41] – Alan Shea
+++ ats:inteli [2024/09/21 22:24] (current) – [117 ATS -- Automatic Transfer Switch-Contactor] Alan Shea
@@ Line 8: / Line 8: @@
 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.//
 ----
@@ Line 80: / Line 80: @@
     - Genset stops
-====Manual Bypass===
+====Force Generator Operation ==
-  * Operating S2, Manual Bypass, forces selection of Utility or Generator power and bypasses InteliATS controls
+  * Operating S2, Auto/Gen, to the "Gen" position forces selection of Generator by InteliATS
-    * 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.
+  * Switching S2 back to Auto will switch back to Utility power if it is qualified based on normal setpoint limits.
+====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.
+  * S4 is a 3-position center return selector switch with "ON" and "OFF".
+    * S4 is only enabled when S3 is not in "AUTO".
+    * When S3 is in either "City" or "Gen" bypass mode, S4 switches ON or OFF the respective contactor.
+  * 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)
+    * 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.
+    * 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.
+    * 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.
+    * 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.
 ====Emergency Stop===
@@ Line 103: / Line 125: @@
 {{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>

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