ATS Popular Features and Accessories

1. ATS Popular Features and Accessories John J. StarkMarketing Services Coordinator, Russelectric Inc.

2. 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 0.0-259 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 0.0-30.0 seconds, factory set at 0 seconds.

3. N 1 L 2 E ATS Timing Features and Important Commonly Used Accessories Time delay to control contact transition time from neutral to non-preferred source. Programmable 0.0-10 min, factory set at 1 second. Time delay to control contact transition time from neutral to preferred source. Programmable 0.0-10 min, factory set at 1 second.

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

5. ATS Timing Features and Important Commonly Used Accessories Time delay on retransfer to preferred source Programmable 0.0-259 min, factory set at 30 minutes. Programmable function to bypass time delay on retransfer to source 1. Pushbutton 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 0.0-60 min, factory set at 5 minutes.

6. ATS 24 VDC 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 0-9999 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.

7. ATS 24 VDC 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.)

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