Turbo Chef Technologies 2020 manual Convection System, Blower Motor Speed Controller Bmsc, Heaters

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 A-8).

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

3.Press the M key.

4.Use the and keys to navigate the parameters. See page 40.

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.

3.Take a resistance reading of the motor windings and use Figure 34 to verify the resistance readings are correct.

4.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.

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

6.If BMSC is operating properly, inspect the wire harness for damage or shorts (pages 37-38).

7.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-7 = lower, A-8 = upper).

Blower Motor Speed Controller (BMSC)

The motor controller is proprietary and will only operate the convection motor described above. The motor controller is controlled on command from the I/O control board and a 0-10VDC speed command from the I/O control board. See pages 27-28 for troubleshooting.

The Convection System

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

-Blower Motor

-Blower Motor Speed Controller (BMSC)

-Heaters

Blower Motor

The convection motor is a brushless AC switch reluctance type. Its top speed is 7100 RPM at 1 HP. The motor is controlled by a proprietary controller.

Testing Procedure

1.Disconnect line voltage from the unit.

2.Make sure the motor spins freely.

Heaters

The back and front convection heaters are rated at 6750 watts at 208 VAC with a resist- ance of 14.4 Ohms. The heaters are controlled by the K4/K5 solid state relay and can be tested in TEST MODE (see page 17).

Figure 34: Blower Motor Ohm Chart (Motor Windings)