Turbo Chef Technologies 2020 manual Control System, Keypad is an 11-key membrane switch

Page 39

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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Contents TurboChef Technologies, Inc Page 800.90TURBO For further information, callPage Table of Contents Troubleshooting SchematicsOven Systems Important Safety Information Please Read First General Safety InformationReducing Fire Risk S a F ET Y Information Power Cord ReplacementPreventing Oven Damage Grounding InstructionsSpecifications and Installation Page Conveyor DimensionsElectrical Specifications ExteriorOven Construction Installation InstructionsPackaging CertificationsBracket BB Stacking OvensPartition Counter Top / Table Installation Near Open Heat Source Ventilation RequirementsCleaning Daily and Weekly Page Approved cleaner, part number Daily Cleaning InstructionsL E a N I N G Weekly Cleaning InstructionsRemove Inner Oven Components Clean Oven Components Ready the Oven for Use Standard Oven Operation Page Oven Controls Mode 1 Oven Off Mode 2 Belt Speed SelectCooking a Product Mode 7 Idle Mode 3 WarmingMode 4 Soaking Mode 6 Cooling DownChanging a Cooking Profile Name Editing a Cooking ProfileAdjusting the Top and Bottom Air Adjusting the TemperatureThis page intentionally Left blank Oven Modes Page Accessing the Setup Mode Config ModeSetup Mode Accessing the Fault Count ScreenChanging the Display Language Changing the Display TemperatureUpdating the Firmware Edit Modes Select ScreenAccessing the Heat Control Screen Test ModeViewing the Status Indicators Bottom Display Line Entering a New Serial NumberViewing the Serial Number Erasing Oven SettingsTo erase oven settings, press L3 , Initiating a Burn-In TestOven Systems Page Keypad is an 11-key membrane switch Control SystemOutput 24 VDC is on terminals -V and +V Relay, Solid State K5/K4 Heaters Voltage is applied, the relay isFunctioning normally RelayGear Drive Conveyor Motor Speed Controller Cmsc Conveyor SystemGear Drive Conveyor Motor Disconnect line voltage from the unitHeaters Convection SystemBlower Motor Speed Controller Bmsc Blower MotorTroubleshooting Page Fault Code Descriptions Overview of TroubleshootingRO U B L E S H O OT I N G Fault Code TableFault Code Troubleshooting Blower Motor Troubleshooting Are all elements heating Correctly installed?Test the RTD page 22 for resistance/ temperature chart Troubleshoot the blowers pagesRelay functioning Properly? Troubleshoot F1 fault pagesTemperature chart Is the solid stateIs the oven hot? no Clean the airOven clean? Check Wiring pages YESIs the high limit thermostat Is the wiring correct pages 37-40?A-8 Open the right end bell Replace the I/O no control board A-8Remove the chain guard page A-4 Troubleshooting F9 Belt Fault Total Belt Run FailureCorrect wiring pages Settings correctly Correspond with TurboChef settingsObstruction Non-Fault Code TroubleshootingRelocate oven to cooler area Close proximityAnd/or wiring Correctly reinstallPlates Does the problem Operation Blower and/or Installed? BMSCs, heatersRibbon cable Board. Correct wiring if Correct wiringPower? Check wiring fromSchematics Page H E MAT I C S RTD H E MAT I C S Cmsc Parameters Appendix Replacing Oven Components Page Part Details Replacing Oven ComponentsEnd Bells A-6 A-8 A-4 This page intentionally Left blank Figure A-1 Front Oven Components Replacing Items Outside of End BellsPart Number Hardware Description Replacing Items Left End Bell Figure A-5 Blower Motor Assembly DetailPart Number Hardware Description Hardware Part Numbers RTD Replacing Items Right End BellRTD Page Page For service or information
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