Pro-face FP3900-T41, User Manual

Page: 52 / 79

Chapter 3 Installation and Wiring
3-11
3.2.4 Precautions: Grounding
• Connect the FP’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 ter-
minal.
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.
(a) Exclusive grounding (BEST)
(b) Common grounding (OK)
(c) Common grounding (BAD)
FP Unit
Other
Equipment
FP Unit
Other
Equipment
FP Unit
Other
Equipment