User Tools
ats:inteli
Differences
This shows you the differences between two versions of the page.
| Both sides previous revisionPrevious revisionNext revision | Previous revision | ||
| ats:inteli [2024/05/25 12:28] – removed - external edit (Unknown date) 127.0.0.1 | ats:inteli [2024/09/21 22:24] (current) – [117 ATS -- Automatic Transfer Switch-Contactor] Alan Shea | ||
|---|---|---|---|
| Line 1: | Line 1: | ||
| + | ======Auto Mains Fail Transfer Switch :: ComAp Inteli-ATS==== | ||
| + | {{ : | ||
| + | This automatic transfer switch uses a [[https:// | ||
| + | * [[https:// | ||
| + | * [[https:// | ||
| + | |||
| + | ====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:// | ||
| + | |||
| + | * //See the discussion at [[ats: | ||
| + | |||
| + | ---- | ||
| + | \\ | ||
| + | <WRAP center round alert 60%> | ||
| + | \\ | ||
| + | **See warnings below** | ||
| + | </ | ||
| + | \\ | ||
| + | ---- | ||
| + | |||
| + | |||
| + | =====One-Line Diagram=== | ||
| + | {{: | ||
| + | |||
| + | ===Auto Mains Fail Transfer Switch== | ||
| + | <WRAP col2> | ||
| + | One-line diagram, detailed schematic/ | ||
| + | * {{ : | ||
| + | * {{ : | ||
| + | \\ | ||
| + | //(DSN) files can be edited with [[: | ||
| + | </ | ||
| + | =====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: | ||
| + | * **Generator Connected: | ||
| + | * **Load Connected: | ||
| + | * **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 InteliATS: | ||
| + | - 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, InteliATS: | ||
| + | - 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/ | ||
| + | - 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 | ||
| + | |||
| + | ====Force Generator Operation == | ||
| + | * Operating S2, Auto/Gen, to the " | ||
| + | * 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 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! | ||
| + | </ | ||
| + | |||
| + | * Operating S3, Manual Bypass, forces selection of Utility or Generator power and bypasses InteliATS controls, switching InteliATS to " | ||
| + | * S4 is a 3-position center return selector switch with " | ||
| + | * S4 is only enabled when S3 is not in " | ||
| + | * When S3 is in either " | ||
| + | * 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/ | ||
| + | * To turn off the City/ | ||
| + | * 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 " | ||
| + | * To turn off the Generator Power, momentarily turn S4 to the " | ||
| + | * 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=== | ||
| + | * 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== | ||
| + | **// | ||
| + | ====117 ATS -- Automatic Transfer Switch-Contactor=== | ||
| + | * [[https:// | ||
| + | * [[https:// | ||
| + | * | ||
| + | |||
| + | |||
| + | < | ||
| + | |||
| + | {{page>: | ||
| + | |||
| + | <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!** | ||
| + | </ | ||
Page Tools
Except where otherwise noted, content on this wiki is licensed under the following license: CC Attribution-Share Alike 4.0 International
Copyright © Alan Shea, 2011-2025