Proface FP3900 - 19 Flat Panel" - Manual (Page 47)

FP-2500/FP-2600 Series User Manual 3-10
3.2 Wiring
3.2.4 Precautions: Grounding
other
equipment FP unit
FP unit
other
equipment
FP unit
other
equipment
(a) Exclusive grounding (BEST)
(b) Common grounding (OK)
(c) Common grounding (BAD)
3.2.5 Precautions: Input/Output Signal Lines
• Input and output signal lines must be separated from operating circuit power cables.
If this is not possible, use a shielded cable and connect the shield to the FP chassis.
• Connect the FP unit's FG terminal to
an exclusive ground. [diagram (a) -
Grounding resistance of under 100
Ω
.]
• If exclusive grounding is not possible,
use a common connection point.
[diagram (b)]
• The grounding wire should have a
cross sectional area greater than
2mm
2 . Make the connection point as
close to the FP unit as possible, and
make the wire as short as possible.
When using a long grounding wire,
replace the thin wire with a thicker
wire placed in a duct.
• If this equipment does not function
properly when grounded, disconnect
the ground wire from the FG terminal.