The Control System

This section contains information about the following components:

-Control Board -Display -EMI Filter -Fuses

-High-limit Thermostat -Idle Button -Keypad

-Power Supply - 24VDC (Domestic)

-Power Supply - 24VDC (International) -Relay (K3 - Gas)

-Relay (K4 - Ignition) -RTD

-Smart Card Reader -Speaker

-Thermostat - 120ºF (Close on Rise) -Wire Harness

This section also contains testing procedures for the following components:

-Power Supply - 24VDC (Domestic)

-Power Supply - 24VDC (International) -Relay (K3 - Gas)

-Relay (K4 - Ignition) -RTD

Control Board

The control board is powered by the 24 VDC power supply, and sends control voltage to all the relays. See page 45 for a schematic. 24 VDC can be measured at the J9 connector, pins 19 and 8. See pages 45-47.

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 tested at J7, pins 1 and 3 (page 45).

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 situation.

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 both the ignition module and the closed circuit of the I/O control board.

Idle Button

The Idle Button places the oven in idle mode, slowing the blowers to 30%. When lit, idle mode is active.

Keypad

The keypad is an 11-key membrane switch.

Power Supply - 24VDC (Domestic)

The power supply - 24VDC (domestic) con- verts line voltage (208-240 VAC) to 24 VDC. Line voltage (208-240 VAC) is connected to terminals 1 & 4 (jumper between terminals 2

&3, terminal 5 is not used). The resistance

from terminals 1 to 4 (with wires disconnected) is 20.7 W. The output (24 VDC) is on terminals “+OUT” (power = good) and “- OUT” (power = bad).

Testing Procedure

1.Disconnect line voltage from the unit.

2.Take a resistance reading on terminals 1 & 4.

a)If terminal resistance is correct

(20.7 W):

-Apply line voltage to the unit.

-Check for line voltage (208-240 VAC) -at terminals 1 & 4.

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OVEN SYSTEMS

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Image 41
Turbo Chef Technologies 3240 manual Control System, Keypad is an 11-key membrane switch

3240 specifications

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