Foster Cold-Room Technicians Hand Book - Nccvmtc.org
Foster Cold-Room Technicians Hand Book - Nccvmtc.org
Foster Cold-Room Technicians Hand Book - Nccvmtc.org
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<strong>Foster</strong> <strong>Cold</strong> – <strong>Room</strong>Generator / power – supply panelMAINS POWER ‘ON ‘LEGEND :+ = Operator / Close- = release / open(-) = not operate(+) = held operatedN1 + _(8-11) - prevents auto start(6-7) + prepares auto stop ckt(1-3) +X2 + NK + _ (61-62) - prevents operation of gk(51-52) - prevents +ve supply from charging relay(main contacts) +Extend ‘MAINS’ supply to<strong>Cold</strong> –room panel (at R.O)MAINS POWER ‘ OFF ‘ Select at ‘ AUTO ‘ – R1 + - (1-3) + prepares start – cktNK + N1- _ (1-3) – prevents Nkoperation(8-11) +(mainContact) RH1 T1 (start)Disconnect ‘MAINS’Supply ckt. from (87-30) + (after pre-set time,20 sec)<strong>Cold</strong>-room panelM + (starts) T1 + _ (1-4)- if generator could notStart during above preset time(9-11) + This contact prevents further startcommand releases RH1 hence mALARM +X1 +R2 + _ (1-4) - prevents RH1 operation(9-11) + prepares RH2 path(6-7) +Holds R2, X1 and ALARM continues unitRESET BY BRINGING SELECTOR TO ‘O’ POSITION* STARTING FAILURE40
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