NATIONAL ALUMINIUM COMPANY LIMITED - Rites

Wagon Tippler
a). Motor O/L - not tripped
b). Local E-Stop PB - reset
c). Stop PB in main CHP control room - reset
d). All Limit Switches – reset
e). All limit switches – not tripped
Apron Feeder
a). Motor O/L - not tripped.
b). Local stop PB - reset.
Flap Gates
a). End of travel vel limit switches - reset.
b). Torque limit switches - reset.
c). Local stop - reset.
4.3.4 The lists of indications and audio audio-visual visual annunciation given in subsequent clauses are
indicative only and the same shall be finalised during detail engineering.
4.3.5 Status indications in Mimic.
Following individual status indications shall be provided in mimic with individual ON/ OFF
/TRIP indications on HMI of PLC.
(a.) Conveyor 'ON'
(b.) Flap Gate/Rack and Pinion position.
(c.) Belt scale flow rate indicati indication and totalizer.
(d.) Belt sway switch operated for each conveyor (individual switch indication on CRT).
(e.) Pull cord switch operated for each conveyor (Individual switches indication on CRT).
(f.) Zero speed switch operated for each conveyor
(g.) Wagon Tippler ‘ON'
(h.) Apron Feeder ‘ON'
(i.) .) DS/ SW/ VentON (System wise)
Further Mimic lamps and Controls for HT and LT Breakers shall be provided on the control
desk.
4.3.6 Annunication System:
The Control desk shall be provided with adequate number of facia type annunciation
windows for the following audio audio-visual visual fault annunciation purposes. Wherever group
annunciation is provided, alarm status of individual equipment shall be provided on mimic.
Technical Specification:Sec-4,System System Parameters, Operation & Control Philosophy
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