4 WIRING
4-3
4.2 Wiring for the Power Supply
The wiring for the power supply to I/O units must be insulated from the control power source by
using an electrostatic shielded isolation transformer. Shown below is wiring diagrams of two
different power supply installations, one in which an isolation transformer is mounted in the
power distribution panel, and one in which an isolation transformer is mounted in the
programmable controller cubicle.
Case 1 -- an isolation transformer is mounted in the power distribution panel:
Figure 4-2 An Example of Power Supply Wiring with an
Isolation Transformer Mounted in the Power Distribution Panel
Power distribution panel
Programmable controller cubicle
Power supply:
100 to 120 VAC,
single phase, 50/60 Hz
Isolation
transformer
NFB NFB
Panel ground
(connected to
cubicle)
TB
(collecting
LG wires)
Class D grounding
Class D grounding
Class D grounding
Cubicle ground
Cubicle ground
TB
(collecting
FG wires)
TB
(collecting
LG wires)
Grounding metal
piece (insulated
from cubicle)
H
N
LPU unit or
CPU unit
LG
FG
H
N
I/O unit
LG
FG
Symbols: NFB, non-fuse breaker; TB, terminal block.
Содержание HSC-2100
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Страница 102: ...5 MAKING USE OF MODULES ...
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