SEQUENCE
ANALYSIS
20
01/01/2016
what
corrective
steps
need
to
be
taken
to
resolve
this
condition.
Other
possible
causes
could
be:
(1)
Bad
motor,
replace;
(2)
Jammed
unload
system,
correct;
(3)
Loose
wiring
connections
on
terminals,
tighten;
(4)
Defective
overload,
replace.
C2.
Check
for
overflow
condition,
correct.
7A.
Sequence:
Unload
Operation
switch
(SW6)
to
"METER",
energizing
metering
system
circuit.
Action:
Metering
selector
switch
(SW6)
to
"METER"
position,
starts
metering
rolls
and
discharges
at
variable
rate
controlled
by
setting
of
Watlow
moisture
control.
Symptoms:
A.
Metering
rolls
do
not
start.
B.
Dryer
shuts
down
immediately
or
during
unloading
operation.
C.
Rate
of
discharge
cannot
be
controlled.
Possible
Cause:
A1.
Defective
unload
starter
interlock
(AC8).
A2.
Defective
fuse(s)
–
DC
motor
drive
(SCR1).
A3.
Defective
contact
(SW6).
A4.
Defective
DC
motor
drive
(SCR1).
A5.
Defective
DC
motor
and/or
brushes.
B1.
Short
circuit
in
dc
motor
and/or
brushes.
B2.
Short
circuit
in
dc
motor
drive
(SCR1).
C2.
Defective
DC
motor
drive
(SCR1).
C3.
DC
motor
drive
(SCR1)
out
of
calibration.
Corrective
Action:
A1.
If
unload
auger
starter
(S7)
does
pull
in,
check
Load
side
of
interlock
(AC8)
on
unload
auger
starter
(S7)
for
presence
of
voltage
(120
volts).
If
voltage
is
present
at
load
side
of
interlock
(AC8),
check
opposite
side
of
interlock
(AC8).
If
no
voltage
is
present,
the
interlock
(AC8)
is
defective,
replace.
A2.
Check
fuse(s)
located
on
dc
drive
(SCR1)
if
defective,
replace.
A3.
If
voltage
is
present
on
terminal
#45
(120
volts)
with
unload
operation
switch
(SW6)
on
"METER"
then
check
for
voltage
on
terminal
#46.
If
voltage
is
not
present
the
switch
contact
(SW6)
is
defective,
replace.
A4.
If
voltage
is
present
on
terminal
#46
(120
volts)
with
unload
operation
switch
(SW6)
"ON"
then
check
for
voltage
(0
to
90
68
Содержание DP
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