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Product User Manual

Page 11

EPRI Commercial Microwave Fabric Dryer

Gerling Applied Engineering, Inc.

Modesto, CA

  Non-fabric objects such as pencils, cigarette lighters, coins, hair

pins, etc.

The CMFD generally performs better and more reliably with full
loads than with lighter loads. Also, loads should be evenly wetted
as would be typical following a standard wash cycle with spin
drying.

CAUTION:

 

Loads must not contain excessive amounts of

moisture such that water is allowed to accumulate inside the dryer
cavity and/or drip down from the dryer basket. Failure to prevent
water accumulation and dripping may result in electrical damage to
the CMFD. Spin drying of all loads prior to microwave drying is
highly recommended.

Drying Cycle Setting

Any one of three drying cycles can be selected depending on the
type of fabric load.

  Regular: This cycle combines microwave energy with

conventional hot air. During the drying stage all three microwave
power supplies are on while two of the three duct heaters are
on. The final stage of the drying cycle is a three minute cool-
down period during which the microwave supplies and duct
heaters are all turned off.

  Delicate: This cycle utilizes only microwave energy to provide

the lowest temperature drying of the three cycles. Heated air is
provided only by the waste energy that is dissipated by and
salvaged from the microwave power supplies. As with the other
cycles, the final stage is a three minute cool-down period during
which all microwave supplies and duct heaters are turned off.

Cycle Start

Close the dryer door and press the ‘Start’ button to begin the drying
cycle. The basket will immediately begin to rotate and the main
blower will operate. Approximately five seconds later the microwave
power supplies will be turned on as can be verified by the ‘clack’ of
the associates contactors.

Failure to start properly will usually be due to one the following:

  An interlock is not satisfied, in which case the buzzer will

immediately sound for ten seconds (see general fault cycle
described below). Check to be sure the door is closed tightly
and all covers are in place, then try again.

  One or more gas sensors have caused a fault condition, in

which case the basket and blower will operate but the ‘clack’ of

Содержание CMFD

Страница 1: ...P O Box 580816 Modesto CA 95358 Product User Manual EPRI Commercial Microwave Fabric Dryer Document 930001 Rev 2 July 1999...

Страница 2: ...as otherwise authorized by GAE All shipping charges for warranty repair or replacement are the purchaser s responsibility unless otherwise agreed to by GAE This warranty supercedes all other warrantie...

Страница 3: ...illiwatts per square centimeter to be generated in an area accessible to operating personnel Contact GAE Inc for technical support prior to installation and or operation of these units if there is any...

Страница 4: ...reen Cleaning 13 THEORY OF OPERATION 14 Dielectric Heating 14 Microwave Power Generators 14 Field Strength Sensor 15 Arc Detector 16 Exhaust Humidity Sensor 16 Exhaust Gas Sensors 17 Magnetron Thermal...

Страница 5: ...nality remains intact certain functions and features have been altered or deleted from the original design specification due to discrepancies or conflicts in their operation Some of these alterations...

Страница 6: ...g electronics providing a total hot air capacity of approximately 6 5 kW Selectable drying cycles include Regular and Delicate the Dryness selector has been disabled The Regular drying cycle combines...

Страница 7: ...st Duct 4 Diameter Free Air Displacement 175 CFM approximate Overall Dimensions 30 High x 36 Deep x 62 High Weight approx 700 lb net 960 lb shipping Controls Cycle Start Pushbutton Cycle Stop Pushbutt...

Страница 8: ...the CMFD has not been tested for immunity to noise spikes or other line power conditions that may be present in typical industrial environments A line conditioner and or regulator may be required for...

Страница 9: ...k of the CMFD provides three separate analog voltage signals that are proportional 10VDC 100A to the line current drawn by corresponding subsystems within the CMFD A mating connector is also provided...

Страница 10: ...urn supply power to the microprocessor and other controls NOTE One of the subsystems to which initial power is applied is the suite of four separate gas sensors These sensors require a warm up period...

Страница 11: ...e of the drying cycle is a three minute cool down period during which the microwave supplies and duct heaters are all turned off Delicate This cycle utilizes only microwave energy to provide the lowes...

Страница 12: ...tch may be pressed to stop the drying cycle at any time and for any reason This action initiates the fault cycle during which the buzzer will sound for ten seconds A fault condition as explain below w...

Страница 13: ...d stage begins Checking the load will usual provide clues to help differentiate between gas sensor and general faults Arc Detect Fault Cycle The presence of metallic fabric or objects can when combine...

Страница 14: ...or loss tangent Water is a good example of a lossy material because its molecules have a high dipole moment Most fabrics are made of materials having a relatively low dielectric loss far lower than th...

Страница 15: ...five seconds before the plate voltage supplies Field Strength Sensor The field strength sensor monitors the electric field strength inside the dryer cavity It operates by sensing the microwave field u...

Страница 16: ...present and the electric field strength is high Arcs can result in scorching of fabrics and possibly an open flame if allowed to continue unchecked Arcs are detected using a photo diode that generate...

Страница 17: ...ic Operation section when its slope exceeds a preset value The sensor elements operate most effectively at an elevated temperature thus a heater voltage 5 VDC is supplied in addition to an instrument...

Страница 18: ...directly while others are powered through additional circuitry Devices connected to the output of this power supply are protected by a 5 Amp fuse Gas Sensor Power Supply This power supply is dedicated...

Страница 19: ...nual Page 19 EPRI Commercial Microwave Fabric Dryer Gerling Applied Engineering Inc Modesto CA freely through the center of the cavity as they tumble In any case the maximum allowable basket rotation...

Страница 20: ...he CMFD even during periods of non operation All service personnel must be aware of the hazards involved with high voltage electrical circuitry and high power microwave devices In the event service be...

Страница 21: ...ollows COM 1 19 200 baud No parity 8 data bits 1 stop bit No handshaking Terminal Emulator Data Logging Any terminal emulation program such as HyperTerminal provided with MS Windows 95 can be used to...

Страница 22: ...an also be started using the shortcut keys CTRL SHIFT W but care must be taken to ensure that only one program is running at any given time After the WinWedge software has successfully started the rib...

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