Technical data

CHAP-04.11 AUTOMATION
Page 11 of 15
05. All the new MCCs of CHP and CSP and MCPs of CHP, CSP and
FFP will be of Intelligent Type. i.e. every controller (DOL/RDOL
feeder) will have an intelligent relay having capability to communicate
directly with PLC Controller. Power supply feeders in MCC need not
to communicate with PLC except of those feeders which feed to
other Process MCCs & ACB/MCCB incomers.
06. All the HT breakers & LT breakers in PCC will also have
communication ability to Automation system.
07. All the weighing controller/Indicator panels, VFD etc. will
communicate directly with PLC Controller.
08. Optical link module will be used for converting Electrical bus to
Optical bus.
09. Contactor will consider Remote I/O panels at each electrical
premises with all kinds of Remote I/Os.
10. Additional Engineering spare Remote I/Os will be carefully planned at
each location in such a way that they can be used in the unlikely
event of non-establishment of communication with field devices
having bus communication.
11. One Remote I/O panel (with required numbers interface
modules/types of I/Os) will be planned in each electrical premises,
each electrical floor (in case of multi-story rooms) & junction houses /
Technological Buildings for interfacing of field switches.
12. All the communication cables will be laid in GI pipes. Separate pipes
with separate routes (to the extent possible) will be used for ring
tropology type communication bus.
GENERAL CONTROL REQUIREMENT
13. All the drives will generally be provided with following modes of
operation and control:
 Local De-interlock
 Local interlock
 Remote
Mode of selection will be carried out for all drives with the help of
selector switch provided on the MCCs / MCPs and required nos. of
wall mounted boards / boxes for HT motors.
14. For local operation of drives, permission from Operator at
Despatcher Control room will be obtained which will be named as