28 OVEN SY
STEMS
Ethernet Extension Cable
The ethernet extension cable exits the oven at the
back panel and allows the oven to be connected to
a local networ
k, in case the customer desir
es remote
programming and oven diagnostics reporting.
F
uses
The F1 and F2 fuses ar
e 12-amp
, ATMR, class CC.
The F3 fuse is 20-amp, ATMR.
The F1 fuse (via blue wir
e) and F2 fuse (via brown
wir
e) ar
e designed to blow if an over-current
situation is encountered by the motor controller,
any cooling fan, either filament transformer, power
supply, or stirrer motor. The F3 fuse is designed to
blow in case of an over-current situation relative to
the microwave system (magnetron, high-voltage
transformer
, diode, capacitor).
High Limit Thermostat
The high limit thermostat is a 250
V
AC, 3-pole,
manual-r
eset thermostat with a trip point of 572
º
F
(300
º
C). The thermostat interrupts power to the
main convection heater in the event of an abnormal
condition. Reset the high-limit thermostat by
pressing the reset button (Figure 34).
Keypad
The keypad is a 8 x 11 matrix membrane switch.
F
or details on key functions, see page 7.
LED Light Ring (Sota only)
The LED light ring provides visual cues in regards
to oven operation, and counts down the final 30
seconds of each cook cy
cle.
Magnetron Thermostats
The magnetron thermostats are “open-on rise.”
They are designed to open at 270
º
F (132
º
C),
which triggers an F5 fault.
NO
TE:
The magnetron thermostats are wired in
series. If one opens, the control will switch off both
magnetr
ons until the open thermostat closes. The
thermostats are self-resetting.
P
ower Supply
The po
w
er supply outputs 24 VDC at 40 watts to
the control board and relays.
R
ela
y - K1 Filament
The K1 relay is a 240 VAC, 24 VDC coil, 20 amp,
sealed single-pole relay. It switches power to the
filament transformers.
R
elay - K2 Magnetron Cooling Fans
The K2 r
elay is a 240 VAC, 24 VDC coil, 20 amp,
sealed single-pole relay. It switches power to the
magnetr
on cooling fans when the magnetr
on
filaments are actuated. Power is switched off after
four minutes and fifteen seconds.
NOTE: The four-minute, fifteen-second timer
starts over each time the magnetron filaments are
actuated.
Relay - K3 Stirrer Motor
The K3 relay is a 240 VAC, 24 VDC coil, 20 amp,
sealed single-pole r
elay. It switches power to the
stirr
er motor.
R
ela
y - K6 Voltage
The K6 relay is a 240 VAC, 30 amp, three-pole,
double-throw, 24 VDC relay coil. Operational in
N
or
th America only, it switches between 208 and
240
VAC on the HV transformer and filament
transformer taps (depending on incoming v
oltage).
Through the voltage sensor, the oven defaults to the
240V position and switches to 208 if less than 222
v
olts is detected. 230V/400V international ovens
and all Japan models utilize the N.C. contacts of
the relay to power the microwave transformers.
Figure 34: High-Limit Reset Button
Reset
Button
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