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A
Tfoubleshooting
Cont.
In the event
more
than one solid
state
control fails
at
the
same time, the
line voltage suppty to the
control is suspect.
Check
for
any blown
varistors
across
the
ouput
terminals
of the
Control. This is a
good
indication
of
a
power
spike
on one
of the
phase
lines
to the
griddle
The control
is designed
to
operate,with a
maximum heatsink
temperature of 7fC.
If the control
exceeds
70oC,
eitherthe
control's
thermal compound has
been improperly
applied orthe temperature
in
the
compartment
has exceeded
maximum
ambient.
In addition
to
improperly
installed controls, check
for hot adjacent
equipment, improperty installed insulation
under the
elentents,
or
other heat contrib-
uting conditions.
B.
Replacement
Proper replacement
of the solid state
control is essential for
proper performance.
Before
installing the
control, be
sure
to clean off all of the old thermal compound
left behind
from the old
control. Always
use new
therrnal
compound when replacingthe solid
state
control. Use
of'the special
oil
based
thermal
compound
(silicone)
is an important and
mandatory
step
that allows
for
proper
heat
transfer from the
control to the
metal
plate
orl
which it is mounted. The.thermal
compound
is to be
applied to the
underside
(metal
side)
of
the
control as a
thin film
approximately
.001
inch
(0A254
cm).
Too
much
compound
will
deter rather than help to transfer away
the
heat
generated
by the
control's thyristor.
Purchase
the compound
under TM Part Number 3103116.
For wiring reference
to the
control,
see
Figure 1
below.
The baseplate
mounting
screws should be
tightened
to
.15
inch
pounds
for exact
contact to
the
surface.
The load
terminals should
be torqued
to
10
inch
lbs
whe:r securing
the terminal
connections of the
wires.
Always
replaqp the
varistor across the high
voltage
oiitput
terminals on the
control. when
changing
the
control. The
varistor
provides proctoction
from voltage
spikes as the
tyristor
switches
the
power
on
and
off.
The
voltage
tolprarice on the load
terminals
of
the
control is 20
-
300
Volts
RMS
and the
load
terminal amperage
is
40 Amps
RMS.
AC Output
Thermocouole
From
Potentiometer
Figure I.