E&I Interface

E & I INTERFACE AND CONTROL SCHEMATIC DIAGRAM

PRESENTED BY : ARIN DEY ON 15 JAN 2009

1

Trusted by over 1 million members

Try Scribd FREE for 30 days to access over 125 million titles without ads or interruptions! Start Free Trial Cancel Anytime.







What is Interface? •

Interaction and activities of two or more disciplines in a common area by systematic method of exchange of information.

Why interface is important? • • • •

•

It ensures smooth, proper and timely execution of project. It finalizes inter-discipline scope of work and thus prevents duplication of work and gap of work. It reduces physical clash of equipments/items. It helps to determine the proper size and rating of equipments / structures (i.e. UPS sizing, Motor rating, Trench sizing, Pipe Rack sizing etc). It finalizes inter-discipline scope of supply and thus prevents









Area of Interface • • • • • • • •

PLC/DCS/SIS operated Pumps and other Drives Motor Operated Valves UPS Power requirements for Instrumentatio Instrumentationn Non UPS power requirements for Instrumentation Cable Routing through Cable Tray/Trench/Duct Electric Tracing of Instruments Earthing Specific Illumination requirements









TYPICAL CONTROL SCHEMATIC OF A 3 PHASE, 415V UNIDIRECTIONAL MOTOR FEEDER









Signal Interface between PLC/DCS/SIS and MCC •

From C&I to Electrical : Command signals – Start/ Stop/Trip from DCS Stop/ Auto start from SIS

Status signals ON/ OFF/Trip/ Status to DCS ON/ OFF/Trip/ Status to SIS Typical signal interface list for a large Drive: •

From Electrical to C&I :

From MCC/SWGR to DCS Drive ON (DI) Drive OFF (DI) Drive TRIPPED(DI) L/R SS selected in Field (i.e. Local) (DI) L/R SS selected in MCC (DI) Thermal O/L Relay operated (DI) MCC/SWGR Disturbance (DI) Control Supply Healthy (DI) Emergency Stop PB Operated (DI) Motor Current (AI)

From DCS to MCC/SWGR Drive START (DO) Drive STOP (DO) Drive TRIP (DO)









INTERFACE FOR UNIDIRECTIONAL MOTORS











Motor Operated Valves •

Generally MOV belongs to Instrumentation item and it is requisitioned by the C&I Group.

•

3 phase power supply to the actuator is provided by Electrical Group. C&I group indicates the location of MOV at field and accordingly Electrical group estimates the power cable length and route. Cable size is determined based on Load List.









TYPICAL CONTROL SCHEMATIC OF A 3 PHASE, 415V BI-DIRECTIONAL MOTOR FEEDER









INTERFACE FOR BI-DIRECTIONAL DRIVES









LOGIC LEGEND









MOTOR OPERATED VALVE OPEN / CLOSE LOGIC











ACW PUMP-1 START / STOP LOGIC









SIMPLIFIED MOTOR CONTROL PHILOSOPHY

















INTERFACE TYPE









































E&I Interface

Recommend Documents