Rev
B
MN301030
11
of
14
ELECTRICAL
INSTALLATION
Step
Seven
Wiring:
An
external
power
supply
delivering
13
‐
30
VDC
with
minimum
current
capability
of
40
mA
DC
(per
transmitter)
is
required
to
power
the
control
loop.
See
Figure
A
below
for
connection
of
the
power
supply,
transmitter
and
receiver.
The
range
of
appropriate
receiver
load
resistance
(RL)
for
the
DC
power
supply
voltage
available
is
expressed
by
the
formula:
RLmax
=
(Vsup
–
10V)
/
20
mA
DC
Shielded
cable
is
recommended
for
control
loop
wiring.
Use
the
Red
wire
/
(1)
terminal
as
the
(+)
and
the
Black
wire
/
(2)
terminal
as
the
(
‐
).
Fig.
A
Connections
Cable
Version
(LD30
‐
S_01
Series)
(+)
=
Red
Wire
&
(
‐
)
=
Black
Wire
Conduit
Version
(LD30
‐
S_11
Series)
(+)
=
Terminal
#1
&
(
‐
)
=
Terminal
#2
Wiring
to
a
Loop
Powered
Display
Wiring
to
a
Typical
PLC
