16
of
18
LC900007
Rev
A2
EXERCISE
Step
Ten
The
following
exercise
demonstrates
inventory
control
with
automatic
filling
and
a
high
level
alarm.
The
usable
range
is
60
inches
of
liquid.
The
pump
starts
filling
at
10
inches
of
liquid
and
stops
filling
at
50
inches
of
liquid.
A
high
level
alarm
occurs
at
55
inches
of
liquid.
Enter
all
values
into
the
LC52
in
inches.
The
OFFSET
is
the
corresponding
4
mA
setting
in
inches.
The
SPAN
is
the
corresponding
20mA
setting
in
inches.
RLY2A
and
RLY2B
is
dedicated
to
the
filling
of
the
tank
because
RELAY2
is
a
latching
relay.
RLY1
is
dedicated
to
the
high
level
alarm
because
it
is
a
single
set
point
relay.
Use
the
following
values
for
programming
the
LC52
‐
1001.
OFFSET
0.0
SPAN
60.0
RLY
1
55.0
RLY
2A
50.0
RLY
2B
10.0
The
next
exercise
demonstrates
the
same
inventory
control
with
automatic
filling
and
a
high
level
alarm.
However,
the
units
have
been
changes
from
inches
to
gallons.
Within
the
tank,
1”
=
50
gallons
of
liquid.
The
usable
range
is
now
300
gallons
of
liquid.
The
pump
starts
filling
at
50
gallons
of
liquid
and
stops
filling
at
250
gallons
of
liquid.
A
high
level
alarm
occurs
at
275
gallons
of
liquid.
Enter
all
values
into
the
LC52
in
gallons.
The
OFFSET
is
the
corresponding
4
mA
setting
in
gallons.
The
SPAN
is
the
corresponding
20
mA
setting
in
gallons.
RLY2A
and
RLY2B
is
dedicated
to
the
filling
of
the
tank
because
RELAY2
is
a
latching
relay.
RLY1
is
dedicated
to
the
high
level
alarm
because
it
is
a
single
set
point
relay.
Use
the
following
values
for
programming
the
LC52
‐
1001.
OFFSET
0
SPAN
300
RLY
1
275
RLY
2A
250
RLY
2B
50