14 THE CONTROL SYSTEM

CONTROL SYSTEM COMPONENT DESCRIPTIONS

24 VDC Power Supply

24 VDC output at 40 watts. Supplies control voltage for I/O control board, 24 VDC mechanical relays, and solid state relays.

K1 Mechanical Relay

240 VAC, 30 Amp, Double Pole, Double Throw, 24 VDC Relay Coil. Switches power to the magnetron filament transformers.

K2 Mechanical Relay

240 VAC, 30 Amp, Double Pole, Double Throw, 24 VDC Relay Coil. Switches power to the magnetron high voltage transformers.

K3 Mechanical Relay

240 VAC, 30 Amp, Double Pole, Double Throw, 24 VDC Relay Coil. Safety interlock device designed to short L1 and L2 if the monitor switch opens before the primary or secondary interlock switches.

K4/K5 SSR

240 VAC, Dual 40 Amp Solid State Relay. K4 (right) controls the convection heater and K5 (left) controls the IR element.

K6 Mechanical Relay (North America Only)

240 VAC, 30 Amp, Three Pole, Double Throw, 24 VDC Relay Coil. Responsible for switching between the 208VAC and 240VAC taps on the high volt- age and filament transformers.

K7 Relay

24 VDC, 20 Amp, Sealed. Starts with command from I/O board; switches magnetron cooling fan on and off. Timer for switching off mag fan is 4:15 after filament switches off.

Interlock Switches

Primary, Secondary, and Monitor Interlock Switches . Must be actuated by the oven door. When the door opens, the order is: P, S, M.

IR Thermocouple

Type K Thermocouple. Embedded in the IR ele- ment, the IR thermocouple measures the inter- nal/sheath temperature of the IR element. Valid IR set points are between 500ºF (260ºC) and 1150ºF (621ºC). The display indicates 1999ºF/C if the thermocouple is “open”.

EC Thermocouple (P/N 700-1199)

Type K Thermocouple. Thermocouple measures the temperature of the electrical compartment. If the temperature within the electrical compartment is above 158ºF (70ºC), the control displays F6: EC TEMP. The control board checks the EC tempera- ture every 60 seconds.

CC Thermocouple

Type K Thermocouple. Thermocouple measures the temperature of the re-circulating impingement airflow. Valid CC set points vary depending on software. If the display indicates 999ºF/C, the ther- mocouple is “open.”

BMSC

Proprietary Brushless DC Motor Controller. Designed solely to operate the blower motor.

VFD (Display)

Vacuum Fluorescent Display.

Keypad

5x9 Matrix Membrane Switch. Keypad is connected to the I/O control board via 14-pin flat cable.

Voltage Sensor (North America Only)

Proprietary device designed to measure incoming line voltage and switch between 208 and 240 VAC operation. The device measures and allows the user to configure the oven only when the oven is first powered on. Voltage sensor will default at 240 VAC.

TEST MODE

The Test Mode allows the service technician to operate the oven’s subsystems individually. It also allows the operator to configure various presets.

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Turbo Chef Technologies NGC-1007 VDC Power Supply, K1 Mechanical Relay, K2 Mechanical Relay, K3 Mechanical Relay, K7 Relay

NGC-1007 specifications

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