Chapter 4 Installation (hardware)
4 – 5
(3) Wiring to the power module
0000
1111
4444
5555
8888
9999
12
12
12
12
13
13
13
13
SERIAL
EH-150
HITACHI
POWER
Power supply
for sensor
Leak brake
100 V AC
to 200 V AC
Noise
filter
Insulation
transformer
with shield
ETHER
NET
USB
2.0
Figure 4.4 Wiring power diagram
(a) For power supply wiring, use a cable of 2 mm
2
(0.0031in
2
.) or more to prevent a voltage drop
from occurring.
(b) The function ground terminal (FE terminal)
should use a cable of 2 mm
2
(0.0031in
2
) or more
and Class D grounding (100
Ω
or less). The
appropriate distance for ground cable is within
20m (65.62ft.).
1] Shared with instrumentation panel, relay panel
grounding.
2] Avoid joint grounding with equipment that can
generate noise such as high-frequency heating
furnace, large power panel (several kW or
more), thyristor exchanger, electric welders, etc.
3] Be sure to connect a noise filter (NF) to the
power cable.
(c) A terminal screw is an M3. Tighten screws within
a torque range of 0.49 to 0.78 N
･
m when
wiring.
(d) Use the same power supply system for the basic
and expansion units.
(4) Wiring cable for I/O signals
A screw for all terminals is M3.
Tighten within a torque range of 0.49 to 0.78 N
･
m.
Use a crimp terminal with an outer diameter ot
6mm (0.24in.) or less when using it.
Use only up to 2 crimp terminals in the same
terminal. Avoid claming down more than 3 at the
same time.
Use a cable thickness of 0.75mm
2
(0.0011in
2
.) at
the maximum. (Use a 0.5mm
2
(0.00075in
2
.) cable
when adding 2 crimp terminals in the same
terminal.)
Note: Use shielded cable for the relay output
module when corresponding to CE marking
EMC command is necessary.
Attaching the terminal block
1]
4]
2]
3]
1] Align the tip of a terminal block mounting screw
to the screw section of the I/O cover insertion
fittings.
2] Push in the top of the terminal block until the
I/O cover claw section locks with a click.
3] Tighten terminal block mounting screws while
holding down the upper part of the terminal
block.
4] Pull on the top of the terminal block to make
sure that it is locked and cannot come out.
Note: Always reinstall it following the instructions
above if the terminal block is removed.
