SEQUENCE
ANALYSIS
4
01/01/2016
Action:
Temperature
control
(Watlow
EZ
‐
Zone)
and
moisture
control
(Watlow
EZ
‐
Zone)
are
energized.
Approximate
3
second
delay
for
temperature
control
to
lock
in
related
safety
functions
before
moving
to
“START”.
For
information
on
operation
and
troubleshooting
of
the
Watlow
Controls,
see
section
5.
2B.
Sequence:
Power
switch
(SW1)
to
"START",
energizing
safety
circuit.
Action:
Safety
circuit
proven
light
on
(LT12),
all
safety
circuit
monitor
lights
on
(LT2
–
LT8)
applies
power
to
entire
120
volt
circuit
and
energizes
power
relay
(K1).
How
the
safety
circuit
monitor
lights
work:
Safety
circuit
monitor
lights
(LT2
–
LT8)
indicate
what
part
of
the
safety
circuit
is
working.
To
find
the
problem,
press
the
power
switch
(SW1)
to
the
"START"
position
and
hold.
Find
the
first
light
that
is
not
on.
That
will
show
the
device
that
is
not
allowing
the
safety
circuit
to
lock
in.
*
Place
all
switches
in
"OFF"
position
before
trouble
shooting
*
Symptoms:
A.
No
safety
circuit
proven
light
(LT12)
when
the
power
switch
(SW1)
is
engaged,
but
some
of
the
safety
circuit
monitor
lights
(LT2
–
LT8)
will
light
when
the
power
switch
(SW1)
is
engaged
but
will
go
off
when
the
power
switch
(SW1)
is
released.
B.
Safety
circuit
proven
light
(LT12)
on
when
the
power
switch
(SW1)
is
engaged
but
will
go
off
when
the
power
switch
(SW1)
is
released.
Possible
Causes:
A1.
Defective
power
switch
(SW1).
A2.
No
fan
overload
light
(LT2),
defective
fan
overload
device
(S2,
S3,
S4,
S4),
or
starter
overload
tripped
from
a
fan
motor
drawing
high
amperage.
A3.
No
conveyor
overload
light
(LT3),
defective
conveyor
overload
device
(S5,
S6,
S7,
S8),
or
starter
overload
tripped
from
an
auger
drawing
high
amperage.
A4.
No
feedroll
monitor
light
(LT4),
defective
feedroll
monitor
switch
(SW8),
or
defective
feedroll
monitor
time
delay
relay
(TD2
&
TD3)
A5.
No
discharge
overflow
light
(LT5),
defective
discharge
overflow
switch
or
overflow
condition
has
tripped
switch.
A6.
No
exhaust
temperature
limit
light
(LT6),
defective
exhaust
limit
or
limit
has
tripped
because
of
excessive
exhaust
air
temperature.
52
Содержание DP
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