American Dryer Corp MLS-460 manual Sprinkler Circuit Description

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L4 (light #4) is an “amber” light associated with PB #10 (push button #10), the “SPRINKLER RESET” button. These items are located on the electrical enclosure’s front panel. L4’s function is to give a visual indication that the sprinkler function is asserted and that the pneumatically activated water valve is open.

The air actuated water valve also has a visual indicator to show its current state. Notice a “red” button on the rear side of the valve.

IN = Valve CLOSED

OUT = Valve OPEN

NOTE: The sprinkler water inlet line has a hand operated gate valve and must be open for water to flow. It is suggested that this manual valve be closed when working on the dryer, to avoid problems caused by false tripping of the sprinkler circuit.

IMPORTANT: BE SURE TO TURN ON THE VALVE WHEN THE WORK IS COMPLETE.

PB #10 (push button #10) “SPRINKLER RESET” button is for resetting the sprinkler circuit once the temperature in the tumbler (basket) has dropped below its preset trip temperature.

NOTE: Pressing the “SPRINKLER RESET” button before the tumbler (basket) temperature has dropped below its trip temperature will momentarily stop the water flow. However, the water flow will resume once the button is released.

UV is the “UNDER VOLTAGE” detection coil of the MLS-460 MAIN DISCONNECT switch, DISC #1. It is this device that controls the automatic POWER DOWN of the dryer when the sprinkler is activated.

SPRINKLER CIRCUIT DESCRIPTION

The following information assumes that the reader has read the sprinkler component descriptions and is following the MLS-460 Ladder Diagram of the Sprinkler Circuit.

STATE 1 - The tumbler (basket) temperature is “BELOW” SHLC (Sprinkler High Limit Controller) preset trip value. When power is applied to SHLC:

SHLC set point will close.

SHLC alarm will open.

UV (under voltage) will engage.

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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 Power Malfunctions ServiceMotors Section Important InformationSafety Precautions Explosion could ResultPage SPECIFICATIONS/DIMENSIONS SpecificationsDimensions Reassembly of Dryer Installation ProceduresReattach The Control Pendant Arm Reassembly Instructions For Dryers Shipped In Three 3 Pieces Page Location Requirements Internal AIR, ELECTRICAL, and Water Connections Air Front Tilt Piston and Sprinkler LinesPage Temperature Probe, Base, and Tumbler Basket Disconnects Electric Tumbler Basket MotorsPage Pendant Tumbler Basket Junction Box Disconnect Left Drum MotorExternal Supply Connections Condensate return line must be 1-1/4 pipe Exhaust Ducting Page Electrical Requirements Electrical RequirementsLatest Edition Electrical Service Specifications MLS-460 SteamPage Fresh AIR Supply Requirements Steam Information Steam RequirementsShut Down Instructions PRE START-UP Preparation for OperationRoutine Maintenance CleaningSuggested Cleaning Schedule Clean any lint accumulation from inside the heat consoleMonthly Component System Descriptions Tumbler Basket Support and Drive SystemPage 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 SERVICE/PARTS InformationParts Warranty Information Returning Warranty CardsWarranty Returning Warranty PartsPage Troubleshooting Troubleshooting Table of Contents NumberVerify red Sprinkler Power on main panel to be illuminated Power MalfunctionsMain Disconnect Will Not Turn On If NO, refer to paragraph #1 above Machine Main Power Shuts Down Blue Indicator Off Sprinkler circuit may be defective3CR CRB Not Used Sprinkler Circuit ComponentsSprinkler Circuit Description Page Emergency Stop E-Stop Buttons 1, 2, Malfunctioning PLC Programmable Logic ControllerPage PLC Message HI-TEMP Fault General DescriptionPage Page Tumbler Basket Section Electrical Malfunctions IntroductionDrum 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 Wiring Back the PLC Programmable Logic Controller DS1-B=LOAD Door Switch DS2-B=UNLOAD Door SwitchProbable Solutions Base Section Electrical Malfunctions Lint Drawer Proximity Switches Wiring Back to the PLC Programmable Logic ControllerPage Probable Causes Pendant Control Malfunctions Load Level Unload Tumbler Reverse Tumbler ForwardSEL a = Load SEL B = Unload Tumbler Reverse Pendant --- PB2Tumbler Forward Pendant --- PB1 Fuse 4 on Main Electrical Panel Faulty Switches Wiring Back to PLC Programmable Logic ControllerMLS-460 Pendant Assembly Diagram Wiring DiagramDisconnect Plug Faulty Switch Wiring Back to TB1 Temperature SensingAnother Emergency Stop E-Stop Button Temperature Sensing Component Descriptions Exhaust RTD Resistive Temperature Device Sens1With the control voltage OFF Circuit Wiring to the Analog Input Module MotorsVerify current setting Check circuit Check motor Retest LS-460 Idling LS-460 Running ADC113073 1- 01/14/00-15