Grounding; I/O Signal Line Placement - Pro-face PS-3650A Series Hardware Manual

PS-3650A/PS-3651A Series Hardware Manual
3.3.3

Grounding

This section describes the precautions for grounding the PS-A unit.
Do not use common grounding, since it can lead to an accident or machine breakdown.
(a) Exclusive Grounding (BEST)
PS-A Unit
(b) Common Grounding (OK)
PS-A Unit
(c)Common Grounding (Not OK)
PS-A Unit
• If the equipment does not function properly when grounded, disconnect the ground wire from the FG
terminal.
3.3.4

I/O Signal Line Placement

• Input and output signal lines must be separated from the power control cables for operating circuits.
• If this is not possible, use a shielded cable and ground the edge of the shield.
3-24
• When supplying power to the PS-A unit, be sure to
separate the input/output and power lines, as shown.
Other
[diagram (a)]
Equipment
Other
Equipment
Other
Equipment
• If exclusive grounding is not possible, use a common
connection point. [diagram (b)]
• Check that the grounding
resistance is 100Ω or less.
• FG and SG terminals are
internally connected in the PS-A
unit. When connecting an
external device to the PS-A unit
using the SG terminal, be sure
to check that no short-circuit
loop is created when you setup
the system.
• The grounding wire should have
a cross sectional area of 2mm
or greater. Create the
connection point as close to the
PS-A 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, and place it in a
duct.
2