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DONNELLY ENGINEERING ELECTRICAL withstand high fault current levels without contact damage or separation. Parallel main contacts are not acceptable. Contacts shall be open and inspectable type. C. Exercise Timer: Include an exerciser with the transfer switches for exercising the generator in loaded or unloaded condition, up to every 168 hours for a period adjustable from a minimum of 20 minute intervals to 24 hours. D. Engine Start Delay: Time delay to override momentary normal source power outages to delay engine start signal and transfer switch operation. Adjustable 0.5 to 3 seconds,factory set at 1.5 seconds. E. Load Test Switch: Load test switch to simulate normal power failure. (Maintained type). F. Contact Failure indicators: Contact to close on failure of normal source to interface with data acquisition panel. Contact to open on failure of normal source to initiate customer functions. G. Pilot lights: Green push to test pilot light on the cabinet door to indicate the main switch in normal position. Red push to test pilot light on the cabinet door to indicate the main switch in emergency position. All lights shall be LED type. No incandescent types are allowed. H. Auxiliary Contacts: Provide an auxiliary contact closed in normal position. Provide an auxiliary contact closed in emergency position. I. Load Shed Relay: Provide a relay energized by 24 volt DC signal from generator control switchgear to disconnect the load from the emergency source when an overload condition occurs. J. Additional Contacts: Two sets of relay contacts shall be provided to open and close upon loss of the normal power supply. K. Doors: Door swings shall be as required based on layout. Refer to drawings for door swing positions. 2.3 OPERATION A. Low Voltage: Provide engine starting contacts in transfer switches to start the generator if any ungrounded phase of the normal source drops below 70 percent of rated voltage,after a non-adjustable time delay period of 1 to 3 seconds, to allow for momentary dips. B. Transfer: The transfer switch shall transfer to emergency as soon as the generator source voltage and frequency have reached 90 percent of rated values. • C. Stabilization: After restoration of normal power on all phases to 90 to 95 percent of rated voltage, adjustable time delay period of 2 to 25 minutes shall delay transfer to normal power until it has had time to stabilize. If the emergency power source shall fail during the time delay period, the time delay shall be by-passed, and the switch shall return immediately to the normal source. D. Generator No-Load Operation: Whenever the switch has retransferred to normal, the engine-generator shall be allowed to operate at no load for a fixed period of time(5 minutes) to allow it to cool before shut-down. E. Test Switch: The transfer switch shall include a test switch to simulate normal power failure with actual load transfer. Heartland Health Care Center of Zephyrhills-3181 16490-3 DE No 217032 38220 Henry Drive,Zephyrhills, FL 33542 Pending Emergency Rule 59A-4.1265