ATS Popular Features and Accessories John J. Stark Marketing Services Coordinator, Russelectric Inc.

ATS Timing Features and Important Commonly Used Accessories Utility/Gen. Time delay to override momentary source 1 power outages to delay engine start signal and transfer switch operation (delay for generator start). Programmable min, factory set at 3.0 seconds. Utility/Utility. Time delay to override momentary source 1 power outages to delay transfer switch operation (time delay for utility sag). Programmable seconds, factory set at 0 seconds.

ATS Timing Features and Important Commonly Used Accessories Time delay to control contact transition time from neutral to non- preferred source. Programmable min, factory set at 1 second. Time delay to control contact transition time from neutral to preferred source. Programmable min, factory set at 1 second. 1 2 N E L

ATS Important Commonly Used Accessories Load test function (internal) to simulate source 1 power failure. Toggle operated load test switch to simulate source 1 power failure. Contact closure provided by customer to simulate source 1 power failure. Remote Load test function energized by 24 VDC signal from generator control switchgear to simulate source 1 power failure. Internal form “C” contact to initiate engine starting or other customer functions (24 VDC Signal by others)

ATS Timing Features and Important Commonly Used Accessories Time delay on retransfer to preferred source Programmable min, factory set at 30 minutes. Pushbutton to bypass time delay on retransfer to source 1. Programmable function to bypass time delay on retransfer to source 1. Engine overrun to provide unloaded engine operation after retransfer to source 1 (delay for engine cool down), programmable min, factory set at 5 minutes.

ATS Timing Features and Important Commonly Used Accessories Load shed function energized by 24 VDC signal from generator control switchgear to disconnect the load from the source 2 source when an overload condition occurs. An automatic load shed feature is provided. Whenever LSF is enabled the source 2 frequency is compared to the load shed frequency pick-up and drop-out values. When the source 2 frequency is less than the load shed frequency drop-out value 93% (56 Hz) and the load shed timer has expired, then a load shed condition is initiated. The load shed timer is adjustable from seconds and factory set at 1 second. Once the source 2 frequency is greater than or equal to the load shed frequency pick-up value 96% (58 Hz), then the load shed condition is removed. Ancillary benefit: Dual operator is beneficial with this design so ATS doesn’t have to load shed to a dead source. 24 VDC ATS

ATS Timing Features and Important Commonly Used Accessories Block transfer function energized by 24 VDC signal from generator control switchgear to block or allow transfer to source 2 (typically generator), so as not to overload it. This accessory includes an internal programmable function to bypass the block transfer function, and is used for manual operation. A two-position key operated selector switch to bypass the block transfer function, may also be spec’d for manual operation. (Spring return from transfer to auto.) 24 VDC ATS

Arc Flash, Things to Consider External Manual Operator (EMO)External Manual Operator (EMO) Can ATS also be manually transferred safely under load? Shutter (bus isolation) AssemblyShutter (bus isolation) Assembly CCDPCCDP Barriered Compartments (bypass/isolation switches)Barriered Compartments (bypass/isolation switches) All control switches mounted on outsideAll control switches mounted on outside All pertinent labeling affixed to the outside of cabinet, including, model #, Serial #, and emergency phone #All pertinent labeling affixed to the outside of cabinet, including, model #, Serial #, and emergency phone #