Rev
A2
LC900007
7
of
18
GETTING
STARTED
(continued)
Step
Four
The
Latching
Relay
(Automatic
Fill/Empty)
may
be
used
with
any
device
that
outputs
a
4
‐
20
mA
signal.
The
relay
is
a
single
pole,
double
throw
type;
the
controlled
device
can
be
connected
to
either
the
normally
open
or
normally
closed
side
of
the
relay.
Typical
applications
for
Latching
Relays
are
automatic
filling
(starting
fill
pump
at
a
low
level
and
stopping
pump
at
a
high
level)
or
automatic
emptying
operations
(opening
a
drain
valve
at
a
high
level
and
closing
valve
at
low
level).
Guide
to
Controls:
Below
is
a
listing
and
the
location
of
the
different
components
for
the
controller:
1.
Power
indicator:
This
Green
LED
lights
when
AC
power
is
ON.
2.
Relay
indicator:
This
Red
LED
will
light
whenever
the
controller
energizes
the
relay,
in
response
to
the
transmitter
input
and
after
the
time
delay.
3.
AC
Power
terminals:
Connection
of
120
VAC
power
to
the
controller.
The
setting
may
be
changed
to
240
VAC
if
desired.
This
requires
changing
internal
jumpers;
this
is
covered
in
the
Installation
section
of
the
manual.
Polarity
(neutral
and
hot)
does
not
matter.
4.
Relay
terminals
(NC,
C,
NO):
Connect
the
device
you
wish
to
control
(pump,
alarm
etc.)
to
these
terminals:
supply
to
the
COM
terminal,
and
the
device
to
the
NO
or
NC
terminal
as
required.
The
switched
device
should
be
a
non
‐
inductive
load
of
not
more
than
10
amps;
for
reactive
loads
the
current
must
be
derated
or
protection
circuits
used.
When
the
red
LED
is
ON
and
the
relay
is
in
the
energized
state,
the
NO
terminal
will
be
closed
and
the
NC
terminal
will
be
open.
5.
Invert
switch:
This
switch
reverses
the
logic
of
the
relay
control
in
response
to
the
switch(es):
conditions
that
used
to
energize
the
relay
will
now
de
‐
energize
the
relay
and
vice
versa.
6.
Time
delay:
Sets
delay
from
0.15
‐
60
seconds.
Hold
Delay
button
to
increase
delay
in
5
second
increments.
7.
Digital
display:
Shows
the
current
4
‐
20
mA
signal
in
engineering
units.
8.
Input
terminals:
Connect
the
transmitter
wires
to
these
terminals:
A
24
VDC
power
is
provided
for
current
loop
with
an
additional
28
VDC
power
terminal
if
required.
9.
Latch
switch
(relay
2):
This
switch
determines
how
the
relay
will
be
energized
in
response
to
the
two
set
points.
When
LATCH
is
OFF,
the
relay
responds
to
set
point
RLY2A
only;
when
LATCH
is
ON,
the
relay
will
energize
or
de
‐
energize
only
when
both
set
points
(RLY2A
and
RLY2B)
are
in
the
same
condition
(both
wet
or
both
dry).
The
relay
will
remain
latched
until
both
set
points
change
conditions.
10.
Bar
Graph:
Displays
4
‐
20
mA
signal
as
a
percentage
of
the
range.
11.
OP
/
SET:
Used
to
scroll
between
set
points
during
programming.
12.
20
/
Down:
Used
to
decrease
display
value
during
programming
and
for
EasyCal™
Span
set
up.
13.
4
/
Up:
Used
to
increase
display
value
during
programming
and
for
EasyCal™
Offset
set
up.
14.
Repeater
Output:
Isolated
terminal
which
reproduces
the
input
4
‐
20
mA
signal.
Terminal
requires
12
‐
36
VDC
power
for
operation.