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14 January 1981 <br /> 02731 <br /> JOHN FLUKE MANUFACTURING COMPANY, INC. <br /> Control Sequence <br /> Manual and Emergency Computer Shutdowm � <br /> Manual <br /> With main shunt trip breaker closed and computer panel(s) energized, <br /> • Relay R1 (Date Process Computer) and Relay R2 (RSTS Computer) are en- <br /> ergized and all contacts closed. Control power to all Liebert unite <br /> is available. Also, control power is available to Main Vent System <br /> Core A since contact Rle and R2f are closed.� <br /> In emergency in Data Process, activation of any emergency manual push <br /> button station operates the shunt trip breaker in panel 2ADP1 de- <br /> energizing Relay R1 opening all contacts dropping control power to <br /> all Liebert �nits. Contact Rle opens to cut control power to Main <br /> Vent System Nodule A. <br /> RSTS computet room emergency shutdown push button stations operate <br /> system in id'entical tashion. <br /> Automatic Operation � � <br /> Preaction sprinkler system pressure switch provides trouble alarm <br /> when air pressure in dry pilot line drops to 24 PS1 (buzzers sound <br /> in DP and RSTS computei rooms and Central Monitoring Console). When <br /> air pressure in dry pilot line drops.to 15 PS1 a se�ond trouble alarm <br /> sounds (bells in DP and RSTS computer rooms and Central Ttonitoring <br /> Console).Flhen pressure drops to allow flow of water in sprinkler <br /> main to computer sprinkler system, evacuation alarm sounds, contact <br /> from Relays R6 and R7 energize shunt trip breakers to shut down all <br /> computer power, de-energize relays.Rl and R2, . de-energizing control <br /> power to all Liebeit AC units and Main Vent System Module A. To te- <br /> activate sys[em close main Ureakers in Panels 2ADP and 2ADP1,Main <br /> Vent System Core A is restarted, all Liebert units must be restarted <br /> individually. <br /> I �7. �( ���� <br /> 1 ���� ✓ <br />