Accessing Parameters

WARNING: DO NOT perform this procedure unless instructed by TurboChef.Changing the parameters to other than those preset by TurboChef can damage critical oven components.

NOTE: “Motor Rated Speed” (07) is RPM of motor before gearbox, not after.

1.Open the right end bell (page 1).

2.Locate the CMSC (page A-8).

3.Press the M key.

4.Use the and keys to navigate the parameters.

5.Press the M key to access the parameter shown on the CMSC display.

6.Use the and keys to manipulate the parameter.

7.Press the M key to return to the parameter selection.

8.Repeat steps 4-7 to manipulate other parameters as needed.

The Blower System

This section contains information about and testing procedures for the following components:

-Blower Motor

-Blower Motor Speed Controller (BMSC)

Blower Motor

The main blowers are 3400 RPM, 3-phase blower motors. The speed of the blower motor is controlled by the voltage frequency applied to the motor windings from the blower motor speed controller (BMSC).

Testing Procedure

1.Disconnect line voltage from the unit.

2.Take a resistance reading of the motor

windings and use Figure 31 to verify the resistance readings are correct.

3.If the resistance readings are correct, reconnect motor wiring and then apply line voltage to the unit and check for voltage applied to the motor windings.

4.If no voltage is present, ensure the BMSC is operating properly (see below).

5.If BMSC is operating properly, inspect the wire harness for damage or shorts (page 45).

6.If wire harness is intact and undamaged and the BMSC is operating properly, the blower motor is damaged or defective and must be replaced (page A-8 = lower, A-12 = upper).

Blower Motor Speed Controller (BMSC)

The BMSC converts single-phase line voltage (208-240 VAC) to a three-phase output. The speed of the blower motor is controlled by the frequency output of the BMSC. The BMSC receives an input voltage (0-10 VDC) from the I/O control board and adjusts the frequency output to the blower motor.

Testing Procedure

CAUTION: Capacitors on the BMSC may retain charge after power is removed. To discharge capacitors for further safety, short B+ and B- together.

WARNING: DO NOT connect incoming AC power to output terminals U, V, or W or terminals B+ or B-. This will seriously damage the BMSC.

1.Ensure that no faults appear on the display during the operation of the BMSC. The control will display the frequency output if the system is operating correctly.

To

From

Description

Expected Resistance

Blue

Brown

Winding (A-B)

5.1-5.5 W

 

 

 

 

Blue

White

Winding (A-C)

5.1-5.5 W

 

 

 

 

Brown

White

Winding (B-C)

5.1-5.5 W

 

 

 

 

Blue, Brown, or

Green

Windings to

Open

White

chassis

 

 

 

 

 

 

25

OVEN SYSTEMS

Figure 31: Blower Motor Ohm Chart (Motor Windings)

Page 45
Image 45
Turbo Chef Technologies 3240 manual Blower System, Blower Motor Ohm Chart Motor Windings

3240 specifications

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