Rockwell Automation 1771-IFF/A INSTL.INSTR FAST ANALOG INPUT - Manual (Page 13)

Publication 1771-IN046B-EN-P - December 2003
Fast Analog Input Module 13
Grounding When using shielded cable wire, ground the foil shield and drain wire only at
one end of the cable. We recommend that you wrap the foil shield and drain
together, and connect them to a chassis mounting bolt, grounding stud or
chassis single-point grounding point. Use heat-shrink tubing to seal the exit
point of the wires. At the opposite end of the cable, tape exposed shield and
drain wire with electrical tape to insulate it from electrical contact.
Remove a length of cable
jacket from the Belden 8761
cable. Pull the foil shield and bare
drain wire from the insulated
wires.
Bare drain
wire
Insulated
wires
Foil
shield
Twist the foil shield and drain
wire together to form a single
strand. Attach a ground lug, and apply
heat shrink tubing to the exit area.
20104
Belden 8761 Cable
Length as needed
Cable Grounding
1
19480
Grounding Stud
1 Use the cup washer if crimp-on lugs are not used.
Chassis Ground
Ground Lug
Ground Lug 1
Star
Washer
I/O Chassis
Side Plate
Nut and Captive
Washer
External-tooth
Washers
#10 Thread-forming screw
19923
Shield and Drain
twisted together
Shield and Drain
twisted together
Single-point Grounding
Extend shield to termination point. Expose just enough
cable to adequately terminate inner conductors.
Use heat shrink tubing or
other suitable insulation
where wire exits cable
jacket.
Nut
When you connect grounding conductors to the I/O
chassis grounding stud, place a star washer under the
first lug, then place a nut with captive lock washer on
top of each ground lug.
2