Hitachi HIDIC MICRO-EH Applications Manual page 249

(3) Wiring to the power module
Power supply
for the sensor
100 V AC to
240 V AC
Power leakage
breaker
Noise
filter
Shielded
insulated
transformer
Figure 10.4 Power supply wiring diagram
(4) Wiring cable for I/O signals
Chapter 10 PLC Installation, Mounting, Wiring
(a) For power supply wiring, use a cable of 2
2
mm
occurring.
(b) For the function ground terminal (PE
terminal), use a cable of 2 mm
provide Class D grounding (100 Ω or less).
The appropriate length for the ground cable
is within 20 m.
1] Instrumentation panel and relay panel
grounding may be shared.
2] Avoid grounding shared with equipment
that may generate noise such as high-
frequency heating furnace, large-scaled
power panel (several kW or more),
thyristor exchanger, electric welders, etc.
3] Connect a noise filter (NF) to the power
cable.
(c) Tighten the terminal screws within the torque
range as shown below.
Unit
10-point
14, 23, 28-point,
expansion
(d) Use the same power supply system for the
basic and expansion units.
Tighten each terminal screw using a torque of the
6
specified torque range.
When using a crimp terminal, use one with an
6
outer diameter of 6 mm or less.
Use only up to two crimp terminals in the same
terminal. Avoid clamping down more than three
at the same time.
Only one piece of cable can be wired per
terminal if the cable type is between AWG14 and
AWG22 (cable thickness ranging between 2.1
2
mm and 0.36 mm
if the cable type is between AWG16 and AWG22
(between 1.3 mm
10-4
or more to prevent a voltage drop from
2
or more and
Clamping
Screw
M2.5 0.3 to 0.4 N m
M3.0 0.5 to 0.6 N m
2
), but two pieces can be wired
2 2
and 0.36 mm ).
torque