The Control System

This section contains information about the following components:

-Control Board

-Display

-EMI Filter

-Fuses

-High-limit Thermostat

-Keypad

-Power Supply, 24VDC

-Relay (K6 - Heaters)

-Relay (K7 - Conveyor Direction)

-Relay, Solid State

-RTD

-Smart Card Reader

-Speaker

-Thermostats - 120ºF (Close on Rise)

-Wire Harness

This section also contains testing procedures for the following components:

-Power Supply - 24VDC

-Relay (K6 - Heaters)

-Relay (K7 - Conveyor Direction)

-RTD

Control Board

The control board is powered by the 24 VDC power supply, and sends control voltage to each relay. See schematics (pages 37-40). 24 VDC can be measured at the J9 connector, pins 19 and 8.

Display

The vacuum fluorescent display is the primary user interface, and is powered by the control board using 5 VDC. Its input voltage can be test- ed at J7, pins 1 and 3 (page 39).

EMI Filter

The EMI filter helps suppress the amount of RF “noise” emitted by the oven, also filtering noise from entering the controls.

Fuses

The control circuit is ultimately protected by two 20-amp class CC fuses, which are in the line- voltage circuit (incoming voltage). The fuses are designed to blow in case of an over-current situa- tion.

High-Limit Thermostat

The high limit thermostat is a 3-pole, manual reset thermostat with a trip point of 572ºF (300ºC). The thermostat interrupts power to the heater elements.

Keypad

The keypad is an 11-key membrane switch.

Power Supply - 24VDC

The power supply converts line voltage to 24 VDC. Line voltage is connected to terminals L &

N.The output (24 VDC) is on terminals “-V” and “+V”.

Testing Procedure

1.Check for line voltage at terminals L & N.

2.If correct voltage is present, check output (-V & +V) for 24 VDC (with output wires disconnected).

3.If voltage is present with output wires disconnected and not present when the wires are connected, inspect the wire harness for damage or shorts (pages 37-40 for schematics).

4.If wire harness is intact and undamaged,

the power supply is damaged or defective and must be replaced (page A-8).

Relays, K6 (Heaters) and K7 (Conveyor Direction)

The K6 and K7 relays are double pole, double throw relays with a 24 VDC coil. The coil resist- ance is 585 W and the contact rating is 30A at 240 VAC. When 24 VDC is applied to the coil, the normally open contacts (7 & 4 or C & NO) close, applying line voltage to energize the heaters (K6) or reverse the conveyor direction (K7).

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OVEN SYSTEMS

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Image 39
Turbo Chef Technologies 2020 Control System, Keypad is an 11-key membrane switch, Output 24 VDC is on terminals -V and +V

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