IS255
‐
21A
J
&D
Manufacturing
•
Eau
Claire,
WI
54701
•
1
‐
800
‐
998
‐
2398
•
www.jdmfg.com
P a g e
|
27
What
is
the
dryoff
time
Now
you
will
learn
about
the
dryoff
time.
The
dryoff
time
is
how
long
the
controller
waits
until
it
may
spray
again.
The
cow
is
supposed
to
dryoff
before
she
gets
wet
again.
How
quickly
the
cows
dries
off
really
varies
with
the
temperature.
As
it
gets
warmer,
your
cows
will
dryoff
sooner.
To
accommodate
this,
the
default
dryoff
time
ramps
lower
and
lower
as
the
temperature
increases.
This
makes
your
sprinklers
spray
more
often
as
the
day
gets
warmer.
Adjusting
dryoff
The
dryoff
time
default
is
15
minutes
at
70°
and
5
minutes
at
90°.
This
is
what
the
industry
feels
is
a
good
number
to
begin
using
your
system.
However,
if
your
cows
are
not
drying
in
the
default
time,
you
can
change
it.
To
change
the
dryoff
time,
Parameter
“P42”
sets
the
70°
dryoff
time.
Parameter
“P43”
sets
the
90°
dryoff
time.
Effective
temperature
When
you
have
an
extra
hot
day,
and
it
cools
at
night,
your
cow
needs
extra
time
to
cool
down.
For
optimum
production
and
breeding,
the
JDN4
‐
5
calculates
an
effective
temperature.
The
effective
temperature
is
patterned
after
your
cow’s
body
temperature.
It
makes
your
fans
and
sprinklers
run
longer
after
a
hot
day.
Effective
temperature
keeps
a
running
average
of
the
past
12
hours
temperature
readings.
Then,
if
the
average
is
above
75°,
it
assumes
the
cows
need
more
time
to
cool.
This
assumption,
adds
5°
to
the
ambient
temperature.
This
is
the
Effective
temperature.
The
fans
and
sprinkler
use
it.
You
can
adjust
the
12
hours,
the
75°
and
5°.
P52
is
the
75°,
the
temperature
at
which
it
assumes
cows
are
overheated
P53
is
the
5°,
how
much
the
controller
adds
to
the
ambient°
P54
is
12
hours,
how
many
hours
of
temperature
readings
are
being
considered.
C12
allows
you
turn
the
effective
temperature
off
for
the
sprinklers.
(See
configuration
menu
Table
2
)
Parameter
ID
Description
Default
Min
Max
P52
Running
average
temperature
at
which
controller
assumes
it
has
been
extra
hot
74º
1º
120º
P53
Degrees
added
to
ambient
temperature
to
calculate
Effective
temperature
6°
0°
20°
P54
Hours
of
temperature
readings
included
in
running
average
12
1
24
Table
6
