American Dryer Corp MLS-460 manual Temperature Sensing Component Descriptions

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1.TEMPERATURE SENSING COMPONENT DESCRIPTIONS

•Exhaust RTD (Resistive Temperature Device) - Sens1

The RTD (Resistive Temperature Device), used throughout the MLS-460 are identical. The main function is to measure temperatures and to transfer this information to a measuring device for further processing. The RTD used on the MLS-460 are rated for 1100° F (593.3° C).

•Sens2 = Exhaust Temperature Sensor

The exhaust RTD (Resistive Temperature Device) is located in the MLS-460 burner area exhaust duct and also has electrical disconnects in a junction box for ease of replacement.

•Exhaust 4 to 20 milliampere (4 to 20 mA) transmitter - Trans1

This transmitter is located on the upper right of the main electrical enclosure panel. The intake and exhaust RTD (Resistive Temperature Device) are respectively connected in series with a 24 volt DC power supply, and the current drawn from the power supply is 4 to 20 milliampere (4 to 20 mA) output signal which is proportional to the input signal. The proportional current information is the connected to the PLC (Programmable Logic Controller) for processing. Refer to the MLS-460 Ladder Diagram for circuit information.

•24 Volt DC Power Supply

The 24 volt power supply used in the MLS-460 is an individual grade switching power supply, rated for

120 volts AC input and 24 volts DC output. The features that this device incorporates are:

•Overload protection to protect the LOAD

•Internal failure protection to protect itself

•An output status indicator; this L.E.D. (light emitting diode) indicates the presence of DC output voltage.

•PLC (Programmable Logic Controller) Analog Input Module - Module #2

This device, attached to the PLC, receives the 4 to 20 milliampere (4 to 20 mA) temperature information and processes this information for the PLC

•Temperature Measurement and Sensing Problems

An “EXHAUST DSFL” MESSAGE is displayed on the operator terminal any time a respective temperature measurement has exceeded the programmed temperature in the PLC (Programmable Logic Controller). A “DSFL” message will stop the current drying cycle and prevent a drying cycle from starting.

2.EXHAUST “DSFL” MESSAGE a. PROBABLE CAUSES;

1)Defective RTD (Resistive Temperature Device) Probe

2)Defective 24 Volt DC Power Supply

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Contents MLS-460 Installation/Operator’s Manual Retain This Manual In a Safe Place For Future Reference For Your Safety Page Table of Contents Service Power MalfunctionsMotors Important Information SectionExplosion could Result Safety PrecautionsPage Specifications SPECIFICATIONS/DIMENSIONSDimensions Installation Procedures Reassembly of DryerReattach The Control Pendant Arm Reassembly Instructions For Dryers Shipped In Three 3 Pieces Page Location Requirements Air Front Tilt Piston and Sprinkler Lines Internal AIR, ELECTRICAL, and Water ConnectionsPage Electric Tumbler Basket Motors Temperature Probe, Base, and Tumbler Basket DisconnectsPage Pendant Left Drum Motor Tumbler Basket Junction Box DisconnectExternal Supply Connections Condensate return line must be 1-1/4 pipe Exhaust Ducting Page Electrical Requirements Electrical RequirementsLatest Edition MLS-460 Steam Electrical Service SpecificationsPage Fresh AIR Supply Requirements Steam Requirements Steam InformationShut Down Instructions Preparation for Operation PRE START-UPClean any lint accumulation from inside the heat console Routine MaintenanceCleaning Suggested Cleaning ScheduleMonthly Tumbler Basket Support and Drive System Component System DescriptionsPage Page Main AIR Blower and Heat Reclaimer System Heat Reclaimer Adjustment Remove Electricity from the Unit Compressed AIR System Page Safety Devices Door Open SERVICE/PARTS Information ServiceParts Returning Warranty Parts Warranty InformationReturning Warranty Cards WarrantyPage Troubleshooting Table of Contents Number TroubleshootingPower Malfunctions Verify red Sprinkler Power on main panel to be illuminatedMain Disconnect Will Not Turn On If NO, refer to paragraph #1 above Sprinkler circuit may be defective Machine Main Power Shuts Down Blue Indicator OffSprinkler Circuit Components 3CR CRB Not UsedSprinkler Circuit Description Page Malfunctioning PLC Programmable Logic Controller Emergency Stop E-Stop Buttons 1, 2,Page General Description PLC Message HI-TEMP FaultPage Page Introduction Tumbler Basket Section Electrical MalfunctionsDrum Rotation Sensor PRS1 Rear Panel Control Problems Emergency Stop E-Stop Function If YES, refer to a If NO, refer to b PLC OUT PIN 1 = Drum Reverse PLC OUT PIN 2 = Drum Forward PLC OUT PIN 7 = Unload Door Open PLC OUT PIN 10 = Front UP DS1-B=LOAD Door Switch DS2-B=UNLOAD Door Switch Wiring Back the PLC Programmable Logic ControllerProbable Solutions Base Section Electrical Malfunctions Wiring Back to the PLC Programmable Logic Controller Lint Drawer Proximity SwitchesPage Probable Causes Tumbler Reverse Pendant --- PB2 Pendant Control MalfunctionsLoad Level Unload Tumbler Reverse Tumbler Forward SEL a = Load SEL B = UnloadTumbler Forward Pendant --- PB1 Wiring Diagram Fuse 4 on Main Electrical Panel Faulty SwitchesWiring Back to PLC Programmable Logic Controller MLS-460 Pendant Assembly DiagramTemperature Sensing Disconnect Plug Faulty Switch Wiring Back to TB1Another Emergency Stop E-Stop Button Exhaust RTD Resistive Temperature Device Sens1 Temperature Sensing Component DescriptionsWith the control voltage OFF Motors Circuit Wiring to the Analog Input ModuleVerify current setting Check circuit Check motor Retest LS-460 Idling LS-460 Running ADC113073 1- 01/14/00-15