Control System; Control Board; Cooling Fans; Display - TurboChef ngo Service Manual

Control System

This section contains information about the
following components:

- Control board

- Cooling fans

- Display

- Electrical compartment cooling fan thermostat

- Electrical compartment thermocouple

- EMI filter

- Ethernet extension cable
- Fuses
- High-limit thermostat
- Keypad
- LED Light Ring (So ˇ ta only)
- Magnetron thermostats
- Power supply, 24 VDC
- Relay (K1 - Filament)
- Relay (K2 - Magnetron cooling fans)
- Relay (K3 - Stirrer)
- Relay (K6 - Voltage)
- Relay (K7 - Monitor)
- Relay (K8 - Anode)
- RTD, 3.0"
- Smart card reader
- Solid state relay (K4/K5 - Heater)
- Speaker
- Voltage sensor
- Wire harness
Control Board
The control board controls each electrical com-
ponent of the oven. See page 45 for a schematic.
24 VDC can be measured at pin 2 of the J7 con-
nector to confirm control voltage is being applied.
When replacing a control board, determine if the
oven is connected to the store's network. If so:
1. Record the oven's network information:
a. While the oven is off or cooling down,
press the INFO key.
b. Press the DOWN arrow key to scroll to
screen 2.
c. Select "Set Options."
d. Select "Network Setup."
2. Record the IP, Mask, Gateway, DNS1 and
DNS2 numbers.
3. Input these numbers after replacing the
control board.
If the control board is damaged to the point of not
allowing access to the Network Setup screen, have
the store contact its Oven Connect administrator
to obtain the proper network settings.
Cooling Fans
There are seven total cooling fans. The three fans
across the top of the back panel are inlet fans and
the other four are outlet fans.
The four electrical compartment cooling fans on
the back panel and the one underneath the oven
are actuated by the cooling fan thermostat when
the temperature of the electrical compartment
reaches 120 º F (49 º C). The two magnetron cooling
fans (located on each side of the oven) are actuated
by the K2 relay when the magnetrons are in opera-
tion, and remain on for four minutes and fifteen
seconds after the magnetrons turn off. They oper-
ate at:
- 208/240 VAC (60 Hz with voltage sensing)
- 220 VAC (60 Hz with no voltage sensing)
- 230 VAC (50 Hz installations)
Display
The TFT display is the primary user interface.
Both 24 VDC and 5 VDC are supplied from the
control board through the 3-pin power cable. 24
VDC is used for the backlighting and 5 VDC is
used for the logic systems.
Electrical Compartment Cooling Fan
Thermostat
The cooling fan thermostat actuates the five rear
cooling fans when the electrical compartment
temperature reaches 120 º F (49 º C).
Electrical Compartment Thermocouple
The electrical compartment thermocouple is part
of the control board and measures the temperature
of the electrical compartment. If it is above 158 º F
(70 º C), an F6: EC TEMP fault will display. The
control board checks the electrical compartment
temperature once every 60 seconds.
EMI Filter
The EMI filter helps suppress the amount of RF
interference emitted by the oven.
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