3.If coil resistance is correct (585 k W):

a)Apply line voltage to the unit.

b)Check for 24 VAC at the coil of the relay when the unit is calling for heat.

c)Check the state of the contacts.

-If the normally open contacts (7 & 4 -or C & NO) are closed and the -normally closed contacts (7 & 1 or C -& NC) are open when coil voltage is -applied, the K4 relay is functioning -normally.

-If the normally open contacts (7 & 4 -or C & NO) are not closed and/or the -normally closed contacts (7 & 1 or C -& NC) are not open when coil voltage -is applied, the K4 relay is -malfunctioning and must be replaced.

4.If the coil resistance is incorrect, replace the K4 relay (page A-14).

RTD

The RTD is a resistance temperature detector used to detect the cavity temperature.

Testing Procedure

1.Disconnect the RTD from the I/O control board.

2.Place the RTD in a bowl of ice water for 2 minutes.

3.Take a resistance reading of the RTD.

4.If RTD resistance is not 100 W, RTD is defective and must be replaced.

NOTE: Use Figure 29, page 24 to determine resistance readings at temperatures other than freezing.

Smart Card Reader

The smart card reader allows the oven operator to load a menu/firmware update from a smart card. A menu that already exists in the oven can also be saved to a smart card. For instructions, see page 15.

Speaker

The speaker is separate from the control board, and provides audible feedback to the oven oper- ator whenever a key is pressed or a fault occurs.

Thermostat - 120ºF (Close on Rise)

The cooling fan thermostat actuates the cooling fans when the temperature in the left end bell reaches 120ºF (49ºC).

Wire Harness

The wire harness distributes power to the oven’s electrical components. See page 45 for a schematic.

The Conveyor System

This section contains information about the following components, as well as testing procedures:

-Gear Drive (Conveyor Motor)

-Gear Drive (Conveyor Motor) Speed Controller (CMSC)

Gear Drive (Conveyor Motor)

The conveyor motor is a 1550 RPM, 3-phase motor with a built in Hall Effect Sensor. The speed of the conveyor motor is controlled by the voltage frequency applied to the windings from the CMSC. The Hall Effect Sensor sends a DC pulse back to the control board to verify motor speed. The control board uses these pulses to determine the output DC voltage to the CMSC.

Conveyor ovens with a split-belt configuration will contain separate gear motors and speed con- trollers for each belt.

Testing Procedure

1.Disconnect line voltage from the unit.

2.Take a resistance reading of the motor windings and use Figure 30, page 24 to verify that the resistance readings are correct.

23

OVEN SYSTEMS

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Turbo Chef Technologies 3240 manual Conveyor System, Smart Card Reader, Thermostat 120ºF Close on Rise

3240 specifications

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