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SEQUENCE
ANALYSIS
21
01/01/2016
volts
DC)
on
terminals
#47
(+)
&
#48
(
‐
).
If
voltage
is
not
present,
the
SCR
control
is
defective,
replace.
A5.
Disconnect
motor
wires
and
check
for
continuity.
If
no
continuity,
check
brushes
to
insure
both
brushes
are
making
contact
with
the
rotor.
If
they
are
not,
clean
or
replace.
If
both
brushes
are
making
contact
the
motor
is
defective,
repair
or
replace.
Note:
a
defective
motor
or
brushes
can
result
in
damage
to
the
dc
drive
(SCR1).
B1.
Disconnect
motor
wires
and
check
for
continuity.
If
continuity
is
present
check
each
wire
to
ground
for
a
short
circuit.
If
a
short
circuit
is
present
repair
or
replace
motor.
B2.
With
power
"OFF"
and
dc
motor
wire
disconnected
check
terminal
#47
to
ground
for
a
short
circuit.
If
a
short
circuit
is
present
the
dc
drive
(SCR1)
needs
to
be
repaired
or
replaced.
B3.
Check
for
jammed
metering
roll(s),
correct,
or
check
broken
chain,
repair
or
replace.
C1.
If
voltage
is
present
on
terminal
#46
(120
volts)
with
metering
selector
switch
(SW6)
"on"
then
check
for
voltage
(0
to
90
volts
dc)
on
terminals
#47
(+)
&
#48
(
‐
),
if
voltage
is
not
present
the
SCR
control
is
defective,
replace.
C3.
Step
1:
Remove
the
cover
of
the
dc
drive
(SCR1)
and
locate
the
"MIN",
"MAX"
and
"IR
COMP"
pots
on
the
circuit
board.
Step
2:
Set
the
unload
operation
selector
switch
(SW6)
to
the
"METER"
position.
Step
3:
IR
compensation
adjustment:
(a.)
IR
compensation
is
provided
to
overcome
the
motor's
natural
tendency
to
slow
down
as
load
increases.
If
the
motor
slows
down
excessively
as
it
is
loaded,
the
pot
marked
"IR
COMP"
should
be
adjusted
clockwise.
(b.)
If
the
“IR
COMP”
is
adjusted
too
far
clockwise,
the
motor
will
begin
to
oscillate
in
speed
or
"hunt".
If
this
pulsing
of
speed
occurs,
adjust
the
“IR
COMP”
counterclockwise
until
the
motor
speed
stabilizes.
Step
4:
Minimum
speed
adjustment:
(a.)
Adjust
the
Watlow
moisture
controller
to
0%
output.
69
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