Automated Equipment LLC AFD-280, AFD-280U General Manual

AUTOMATED EQUIPMENT LLC

MODEL AFD-280, AFD-280U

Domestic English Version

COMPREHENSIVE SERVICE MANUAL

MANUFACTURED

FOR

McDONALD'S

AUTOMATED EQUIPMENT LLC

5140 MOUNDVIEW DRIVE

RED WING, MN 55066 U.S.A

PHONE: 1 (800) 248-2724 1 (651) 385-2273 FAX: 1 (651) 385-2166 Service FAX 1 (651) 385-2172

http://www.autoequipllc.com

Fry Dispensers

P/N 203456 REV B

Business Hours: 8:00 AM to 5:00 PM CST

After hours, your call will be handled by a pager service; a Technical Support Representative will return your call

The information in this manual is subject to change without notice.

IN NO EVENT WILL AUTOMATED EQUIPMENT LLC, BE LIABLE FOR TECHNICAL OR EDITORIAL OMISSIONS MADE HEREIN; NOR FOR DIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES RESULTING FROM THE FURNISHING, PERFORMANCE, OR USE OF THIS MATERIAL.

Product names mentioned herein are for identification purposes only, and may be trademarks and/or registered

trademarks of their respective companies.

Written and Illustrated by: Kirby Kuhlemeier

THIRD EDITION (January 2002)

TABLE OF CONTENTS

INTRODUCTION...........................................................................................................................5

SPECIFICATIONS........................................................................................................................5

FCC STATEMENT..........................................................................................................................5

WARRANTY .................................................................................................................................6

REQUESTING SERVICE, ASSISTANCE, OR PARTS.................................................................7

SAFETY........................................................................................................................................8

PRODUCT MODEL AND REVISION IDENTIFICATION .............................................................. 9

Sequence of Operations.............................................................................................................10

Power Up........................................................................................................................................ 10

Normal Weighing Cycle..................................................................................................................10

Normal Basket Cycle (High Production Rates)...............................................................................11

Normal Basket Cycle (Low Production Rates)................................................................................ 12

Continuous Dispensing...................................................................................................................12

Single Basket Mode........................................................................................................................13

Fries Low/Bridging.......................................................................................................................... 13

Error Mode......................................................................................................................................13

The Diagnostic Displays.............................................................................................................14

Input - Output LED Indicators........................................................................................................14

The Service Interface......................................................................................................................15

Power Up........................................................................................................................................ 15

Normal Operation ...........................................................................................................................15

Error Mode......................................................................................................................................15

Selecting a Function.......................................................................................................................16

Function Reference for 1.0 software ......................................................................................... 17

Function List ................................................................................................................................... 17

Function 1 - Restart........................................................................................................................17

Function 2 - Display Last Error.......................................................................................................17

Function 3 - Disable Weighing........................................................................................................17

Function 4 - Tare ............................................................................................................................ 17

Function 5 - Calibrate ..................................................................................................................... 17

Function 6 - Adjust 1.0 target upward.............................................................................................17

Function 7 - Adjust 1.0 target downward........................................................................................18

Function 8 - Adjust 1.5 target upward.............................................................................................18

Function 9 - Adjust 1.5 target downward........................................................................................18

Function 10 - Watchdog test...........................................................................................................18

Function 11 - Load Cell Readout.................................................................................................... 18

Function 12 - Actuate Lift................................................................................................................18

Function 13 - Actuate Doors........................................................................................................... 18

Function 14 - Actuate Stopgate......................................................................................................18

Function 15 - Actuate Drum............................................................................................................18

Function 16 - Actuate Light.............................................................................................................18

Function 17 - Restore Defaults....................................................................................................... 19

Function 18 - Clear Errors .............................................................................................................. 19

Function 19 - Error Counts ............................................................................................................. 19

Function 20 - Parameters...............................................................................................................19

Expanded Function Reference for 2.x software .......................................................................20

Function 6 - Adjust 1.0 target upward.............................................................................................20

Function 7 - Adjust 1.0 target downward........................................................................................20

Function 8 - Adjust 1.5 target upward.............................................................................................20

Function 9 - Adjust 1.5 target downward........................................................................................20

Function 17 - Restore Defaults....................................................................................................... 21

Function 19 - Error Counts ............................................................................................................. 21

Function 20 - Parameters...............................................................................................................21

TABLE OF CONTENTS

Function 21 - Adjust Switch Position #1 UP....................................................................................21

Function 22 - Adjust Switch Position #1 DOWN .............................................................................21

Function 23 - Position #1 Control Status.........................................................................................21

Function 24 - Bypass Mode Enable (volatile setting)......................................................................22

Function 25 - Select Weight Units “US” or “In”................................................................................22

Function 26 - Exercise Mode (volatile setting)................................................................................22

Function 27 - Display EPROM Revision Level................................................................................22

Function 28 – Segment Test...........................................................................................................22

Error Definitions.......................................................................................................................... 23

Error #1 - Air Loss...........................................................................................................................23

Error #2 - Lift Speed........................................................................................................................24

Error #3 - Lift Time-out....................................................................................................................24

Error #4 - Lift Sensor Error..............................................................................................................24

Error #5 - Guide Sensor Error.........................................................................................................25

Error #6 - Lift Down Switch Error ....................................................................................................25

Error #7 - Lift Up Switch Error.........................................................................................................25

Error #8 - Watchdog or Abnormal Reset.........................................................................................25

Error #9 - NVRAM Checksum Error................................................................................................26

Calibrations and Adjustments ................................................................................................... 27

Load Cell Calibration.......................................................................................................................27

Compressor Pressure Control Switch.............................................................................................27

Pressure Regulator.........................................................................................................................27

Air Present Switch...........................................................................................................................28

Power Supply..................................................................................................................................28

Manifold Air Flows...........................................................................................................................28

Lift Saddle speed adjustments........................................................................................................29

Optical Sensors...............................................................................................................................29

Stopgate Linkage............................................................................................................................ 30

Accumulator Door Linkage..............................................................................................................30

Lift Cylinder Switches......................................................................................................................31

Verification of Load Cell A-D Converter.........................................................................................32

Power Switch ..................................................................................................................................33

Load Select Switch..........................................................................................................................33

Start/Reset Button...........................................................................................................................33

Major Assemblies, AFD-280 .......................................................................................................34

AFD-280, Front View.......................................................................................................................34

AFD-280 Side View.........................................................................................................................35

AFD-280 Rear View........................................................................................................................36

AFD-280 Compressor Assembly, Style “A”.....................................................................................36

AFD-280 Compressor Assembly, Style “B”.....................................................................................38

AFD-280 Pressure Regulator Assembly.........................................................................................39

AFD-280 Manifold Assembly...........................................................................................................40

AFD-280 Accumulator Doors / Load Cell Assembly .......................................................................41

AFD-280 Stopgate Assembly.......................................................................................................... 42

AFD-280 Lift Cylinder Assembly.....................................................................................................43

AFD-280 Saddle Assembly.............................................................................................................44

AFD-280 Drum Motor Assembly.....................................................................................................45

AFD-280 Optical Sensors ...............................................................................................................46

AFD-280 24.5 Volt Power Supplies.................................................................................................47

AFD-280 Din Rail Terminal , Circuit Breaker Assembly.................................................................48

AFD-280 Upper Guide Assembly....................................................................................................49

AFD-280 Upper Guide Support Assembly......................................................................................50

AFD-280 Lower Guide ....................................................................................................................51

AFD-280U Product Changes.......................................................................................................52

Front Panel Operations Customization..................................................................................... 52

Configure Switch Position #1 for Automatic Dispensing...............................................................52

TABLE OF CONTENTS

Configure “Bypass” Mode Operation..............................................................................................53

Exercise Mode Operation...............................................................................................................54

Major Assemblies, AFD-280U.....................................................................................................55

AFD-280U Front View.....................................................................................................................55

AFD-280U Side View......................................................................................................................56

AFD-280U Rear View.....................................................................................................................57

AFD-280U Compressor Assembly.................................................................................................. 58

AFD-280U Air Reservoir Assembly ................................................................................................59

AFD-280U Air Pressure Regulator Assembly.................................................................................60

AFD-280U Manifold Assembly “Style A”......................................................................................... 60

AFD-280U Manifold Assembly “Style B”......................................................................................... 62

AFD-280U Accumulator Doors / Load Cell Assembly ....................................................................63

AFD-280U Stopgate Assembly.......................................................................................................64

AFD-280U Lift Cylinder Assembly..................................................................................................65

AFD-280U Saddle Assembly.......................................................................................................... 66

AFD-280U Drum Motor Assembly.................................................................................................. 67

AFD-280U Optical Sensors ............................................................................................................68

AFD-280U 24.5 Volt Power Supply ................................................................................................69

AFD-280U Upper Guide Assembly.................................................................................................69

AFD-280U Upper Guide Support Assembly................................................................................... 70

AFD-280U Lower Guide Assembly.................................................................................................70

Controller Boards........................................................................................................................71

Controller Board 202032.................................................................................................................71

Controller Board 290322.................................................................................................................71

Controller Board 290626.................................................................................................................72

SOFTWARE E-PROM SELECTION............................................................................................. 72

JUMPER SELECTION.................................................................................................................... 72

Electrical Schematics .................................................................................................................73

AFD-280, Electrical Schematic...................................................................................................... 73

AFD-280U Electrical Schematic .....................................................................................................74

AFD-280U Electrical Schematic .....................................................................................................75

AFD-280U REVISION 9..................................................................................................................76

Switch Wiring .............................................................................................................................. 77

Pneumatic Diagrams...................................................................................................................78

AFD-280 Pneumatic Diagram........................................................................................................78

AFD-280U Pneumatic Diagram.....................................................................................................79

AFD-280U Pneumatic Diagram......................................................................................................80

NOTES..........................................................................................................................................81

AFD280, 280U Comprehensive Service Manual

INTRODUCTION

The Fry Dispenser is a compact automated system that replaces manual basketing of fries and the equipment that goes with it. The Fry Dispenser automatically weighs 12 ounce (350 gm), 16 ounce (450 gm) or 24 ounce (700 gm) loads of frozen french fries and dispenses them into the fry baskets. The Fry Dispenser's Hopper holds 42 lbs. (19 kg) of frozen fries prior to Basket Loading. A rotating Dispenser Drum inside the Hopper transfers the frozen fries onto the Accumulator Doors where an electronic Load Cell accurately weighs the French Fries. Empty Fry Baskets are manually placed on the Upper Guide. The Fry Baskets slide under the Accumulator Doors where French Fries are dispensed into them. The Basket Lift then lowers the filled Fry Baskets onto the Lower Guide where the Fry Baskets wait to be picked up by a crew person. The Fry Dispenser is usually positioned to the right of an existing fry station and requires 28 linear inches (72 cm) of floor space. 10 modified Fry Baskets are provided with this equipment.

NOTE: This equipment is manufactured in the U.S., therefore all hardware measurements are in English, and the metric conversions stated are approximate.

HAZARD COMMUNICATION STANDARD (HCS) The procedures in this manual may

include the use of chemical products. These chemical products will be highlighted with boldface letters followed by the abbreviation (HCS) in the text portion of the procedure. See the HCS Manual for the appropriate Material Safety Data Sheets (MSDS).

IMPORTANT

This equipment is only to be installed in locations where use and maintenance is restricted to trained personnel.

This equipment must be placed on a horizontal surface with a tilt of less than 2 degrees.

SPECIFICATIONS

The Fry Dispenser consists of the following components:

• Fry Dispenser AFD-280/U

• 10 Fry Baskets (Modified)

Optional Equipment:

• Replacement/Extra Fry Baskets

Electrical Requirements: Ratings depend on product

destination requirements.

120 VAC, 4 Amp, 60 Hertz 220 ±10% VAC, 2.0 Amp, 50 Hertz 240 ±10% VAC, 2.0 Amp, 50 Hertz

Other Ratings:

Noise Emissions: < 70 dB(A) Maximum Altitude: 6000 ft. (1525 meters) Maximum Humidity: 95% non-condensing Ambient Temperature: 4° - 60°C (40° - 140°F)

Date of Manufacture:

The manufacturing date is encoded into the serial

number identification label on the side panel of the fry dispenser.

Example: s/n AFDR9612C00000 indicates a

manufacturing date of 12-96 or December 1996.

Space Requirements:

Clear floor space near fry vat at least 28 inches (72 cm)

wide and 24 inches (60 cm) deep. Basket Handles will extend to 29 inches (74 cm)

Fry Dispenser:

Bulk storage of 42 lbs. (19 kg) of frozen French Fries Electrically and pneumatically (air) driven. Equipped with swivel casters. Holds up to 7 Fry Baskets. Disassembles for cleaning.

FCC STATEMENT

WARNING: This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause interference to radio communications.

AFD280, 280U Comprehensive Service Manual

WARRANTY

Automated Equipment LLC (hereinafter “AELLC”), warrants the purchased product to be free from manufacturing defects in material and workmanship under normal use and conditions for the period and component specified below:

Components covered Electronic Circuit Board Assemblies 1 year Electrical and Mechanical Moving Parts 1 year Structural frame work or enclosures Crew removable components:

• Drip Tray

• Guide Assemblies & Slides

• Lift Saddle Assembly

• Hopper, Hopper Lid, Diverter

• Drum

• Fryer Baskets

• Power Cord

The Warranty period commences on the date of shipment from AELLC for the Frozen Product Dispenser and/or Dispenser Accessories (hereinafter “Product”).

Term

1 year

90 days 90 days 90 days

90 days 90 days 90 days 90 days

EXCEPT AS OTHERWISE PROVIDED HEREIN AELLC MAKES NO OTHER WARRANTIES, EXPRESSED OR IMPLIED AND SPECIFICALLY DISCLAIMS ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

AELLC shall not be liable for any direct, indirect, consequential damages (including damages for loss of business profits, business interruption, loss of business information and the like) arising out of the use of or inability to use the Product.

THIS WARRANTY IS VOID IF THE PRODUCT IS NOT FUNCTIONING CORRECTLY DUE TO ABUSE OR NEGLECT BY THE PURCHASER, ITS EMPLOYEES, AGENTS, OR OTHER REPRESENTATIVES EITHER BY BREAKING, BENDING, MISUSE, ABUSE, DROPPING, ALTERATION, IMPROPER MAINTENANCE OR ANY OTHER FORM OF NEGLECT OR IMPROPER USAGE. THIS WARRANTY DOES NOT COVER DAMAGE TO THE PRODUCT CAUSED BY NATURAL CAUSES SUCH AS LIGHTNING, ELECTRICAL CURRENT FLUCTUATIONS, FLOOD, FIRE, TORNADOES, OR OTHER ACTS OF GOD. AELLC WILL INVOICE PURCHASER FOR REPAIRS MADE NECESSARY BY THE HEREIN LISTED CAUSES.

This warranty is governed by the substantive laws of Minnesota, U.S.A., without giving effect to the conflict of law provisions.

This warranty is non-transferable and applies only to the original Purchaser.

AFD280, 280U Comprehensive Service Manual

REQUESTING SERVICE, ASSISTANCE, OR PARTS

WARRANTY SERVICE

Warranty service must be initiated by calling AELLC’s Technical Support Hot Line at 1-800-248-2724 (U.S./Canada) or 651-3852273 to establish all warranty requests.

AELLC Technical Support personnel will determine the cause of failure and provide the appropriate resolution. If replacement parts are required, parts will be provided by AELLC or by an authorized Service Support Center/Parts Distributor.

NON-WARRANTY SERVICE

Service is normally conducted by customer appointed personnel, or by contracting a local service agent. Service fees are in accordance with industry standards.

Replacement parts are available through local Service Support Center/Parts Distributors or direct from AELLC by calling 1-800-248-2724 (U.S./Canada) or 651-385-2273 in the event a local distributor is not available.

When repairing this unit, use only replacement parts supplied by AELLC, or supplied by an AELLC Factory Authorized Parts Distributor. Use of replacement parts other than those supplied by AELLC or by an AELLC Factory Authorized Parts Distributor will void the warranty.

All shipping charges are F.O.B. AELLC, and are subject to change without notice. Prices will be those in effect at the time of shipment.

Automated Equipment LLC reserves the right to make suitable substitutions in materials, depending upon their availability.

WARNING!

Only trained and/or qualified personnel should perform service to this equipment.

AELLC's Technical Support Hot Line is available for telephone assistance providing AELLC product technical support, parts and parts information, and service agent referral. Contact AELLC’s Technical Support Hot Line at 1-800-248-2724 (U.S./Canada) or 651-385-

2273. Record the following information for your

records:

Date of Installation

Service Agency Telephone

Serial Number

Service functions described in this manual could cause irreversible damage to the equipment and/or injury to personnel if performed improperly.

If the power cord is damaged, it must be replaced by the manufacturer or its service agent or a similarly qualified person in order to avoid a hazard.

AFD280, 280U Comprehensive Service Manual

SAFETY

Here are some guidelines for operating and maintaining the AFD280/U Dispenser:

• Disconnect the Dispenser Power Cord from the wall outlet before inspecting.

• Inspect the Dispenser on a regular basis to identify problems before they occur.

• Keep the Dispenser clean.

• Keep hands away from the Accumulator Doors and Dispenser Drum while the Dispenser is operating:

• Fryer Baskets may be hot.

• Do NOT roll the Dispenser to the back sink for cleaning, this will cause unnecessary wear on the Dispenser.

• If the supply cord is damaged it must be replaced by the manufacturer or its service agent or a similarly qualified

person in order to avoid a hazard.

• DO NOT SPRAY DOWN THE DISPENSER WITH WATER. It is not sealed against jetting water and contamination may get into sensitive components. This will void the warranty

WARNING!

Only trained and/or qualified personnel should perform

service to this equipment.

INTERNATIONAL SAFETY LABELING

International Safety Labeling is represented with the below symbols. The labels are affixed to the Hopper to clearly indicate areas that could be harmful to the operator of the Dispenser. These safety issues are:

1. BASKETS CAN BE HOT: Baskets should always be picked up by the provided handle.

2. NO HANDS BELOW: Hands should not be placed near or below the Accumulator doors while the Dispenser is energized.

AFD-280E

BASKETS CAN BE HOT

NO HANDS BELOW

AFD280, 280U Comprehensive Service Manual

PRODUCT MODEL AND REVISION IDENTIFICATION

The Switch Control Panel on the front of the dispenser will clearly indicate the Model Number of the Fry Dispenser being either an

The AFD-280 is indicated by the Serial Number of the Unit having a letter

AFD-280 or an AFD-280U.

“C” in the serial number sequence.

Example: AFDR9602C00000

There were some AFD-280U dispensers built with the AFD-280U cabinet and AFD-280 internal parts. They can be identified by having 6 screws holding the back door in place.

The AFD-280U is indicated by the Serial Number of the Unit having a letter sequence.

Serial Numbers and Model Identification can be found on the Data Label, located on the right side of the Dispenser.

“D”, “E” or “F” in the serial number

AFD280, 280U Comprehensive Service Manual

Sequence of Operations

Power Up

When the dispenser is turned on, two separate processes begin. One is the compressor charging (if required), and the other is the internal self test. The self test takes less than one second. The dispenser then waits until the compressor reaches operating pressure before starting the main cycle. During this phase, the dispenser will not attempt to move or actuate anything. A detailed timeline follows. NOTE: The times given in the “Typical Time” column are based on a typical AFD-280/U running normally. Except for the Time outs, they may vary. The times given are cumulative, that is they are the time from power up.

Typical Time Event Response

0 sec.

1 sec. Self Test Completes Controller shows normal display, unless self test fails. If self test fails, all

4 sec. Lift Cylinder Times out If the lift has not been detected in the down position, Error #3 will occur. 15 sec. Drain Valve closes Hiss from beneath dispenser stops. Pressure gauge begins to climb. 35 sec. Operating Pressure Reached Air Present switch activates (input L6 on controller board). Dispenser raises

1 min. - 2 min. Air Present Times out If the Air Present switch has not activated, an Error #1 will occur. 2 min. 35 sec. Maximum Pressure Reached Compressor turns off.

Power Switch Turned ON

Amber Light in power switch turns on. Dispenser begins self test. Controller Display shows all segments lit. If reservoir is below operating pressure, compressor starts. You may hear a hiss from the regulator drain tube until the drain valve closes.

display segments will be lit, all display segments will be off, or display will show Error #9, depending on the failure.

lift, and opens stopgate, then initiates the main cycle. The Pressure Gauge will stop climbing at 30 PSI, but the compressor will continue running.

Normal Weighing Cycle

The function of the fry dispenser is to dispense pre-weighed amounts of fries into baskets. The weighing cycle is triggered when the selector switch is in the automatic modes, or when the restart button is pressed in the single mode. NOTE: The times given in the “Typical Time” column are based on typical AFD-280/U operations. The times given are cumulative, they are the time from the start of the cycle.

Typical Time Event Response

Weighing Cycle Triggered Weighing must wait for the accumulator doors to close. During a normal

cycle, they will be closed before the weighing cycle is triggered.

0 sec. Accumulator Doors Closed After the accumulator doors close, the dispenser waits 2 seconds for the load

cell to stabilize.

2 sec. Initial Reading After the load cell has stabilized, the dispenser takes an initial reading. If the

reading shows that the accumulator doors are empty, or near empty, this reading is used as the zero reference. If the reading shows significant weight, part or all of the weighing cycle will be skipped.

Start Drum Motor The drum motor is turned on at full speed until the load cell indicates that the

weight of fries is within a quarter of a pound of the desired weight.

10 sec. Half speed. The drum motor will begin a pulsing movement designed to slowly deliver

fries to the accumulator doors. This improves the accuracy of the weighing.

15 sec. Full Weight When the load cell reads full weight, the drum motor stops. The dispenser

waits an additional 2 seconds for the load cell to stabilize. 17 sec. Stable Weight If the load cell reading remains within tolerance, the weighing sequence ends. 40 sec. Weighing Time-out If the dispenser has been unable to attain the target weight, the drum motor

stops and the dispenser gives a low fries indication. (Slow blink of the

Start/Reset button) 130 sec. Weighing Retry If the weighing sequence times out, the dispenser restarts the weighing cycle

after 90 seconds.

AFD280, 280U Comprehensive Service Manual

Normal Basket Cycle (High Production Rates)

The dispenser automatically places pre-weighed loads of french fries into fryer baskets. This process runs together with the weighing cycle described in the previous sections. The basket cycle may be triggered by the dispenser itself (in the automatic modes) or by the restart button (in the single mode). The following timeline gives the sequence of operations when there are two or less baskets on the lower guide. NOTE: The times given in the “Typical Time” column are based on typical AFD-280/U operations. The times given are cumulative, they are the time from the start of a cycle.

Typical Time Event Response

Basket Cycle Triggered A basket will not be filled unless the weigh cycle is completed and a basket is

detected. The basket cycle may be triggered at any time (indicated by a steady green light on the restart button), but will be immediately suspended until this condition is met. During continuous operation, the basket cycle will be triggered immediately when the lift is up.

0 sec. Basket Detected at lift The lift sensor detects a basket. The dispenser waits one second to ensure

the basket has settled into the lift.

1 sec. Basket Settled The stopgate closes. Between this time, and the time that the lift goes down,

removing the basket from the lift saddle will cause an error #4. The basket usually enters the lift at about the time the weighing cycle begins. This can vary considerably depending on the use of the dispenser. However, the basket cycle can’t continue until a load of fries is ready. The following timeline assumes that the weighing cycle started at the same time as the basket cycle.

18 sec. Fries Ready When the weighing cycle has completed, the accumulator doors open and

close twice, and then remain open.

20 sec. Fries Dispensed During this time, the dispenser ignores input from the lift sensor. If the guide

sensor detects a basket, the lift saddle does not go down. The accumulator doors remain open for 5 seconds then close, and the weigh cycle is triggered.

22 sec. Lift down The lift down switch closes, indicating the lift saddle is down. From this point,

if the lift sensor detects something, error #4 will occur. The accumulator doors close, and the weighing cycle is triggered.

24 sec. Lift time-out If the lift down switch closes before 1.6 seconds, error #2 will occur. If the lift

down switch does not close within 4.4 seconds, error #3 will occur.

25 sec. Guide sensor time-out If the guide sensor has not detected the basket, error #5 will occur. This

usually indicates that the basket has stopped short of the sensor or is stuck in the lift saddle.

22 sec. Basket detected on lower

guide

23.5 sec. Basket clears the lift The lift saddle goes up.

25.5 sec. Lift Up The lift up switch closes, indicating the lift saddle is up. The stopgate opens.

27.5 sec. Lift time-out If the lift up switch closes before 1.6 seconds, error #2 will occur. If the lift up

The guide sensor detects the basket, the dispenser waits 1.5 seconds to ensure the basket has cleared the lift saddle.

switch does not close within 4.4 seconds, error #3 will occur.

AFD280, 280U Comprehensive Service Manual

Normal Basket Cycle (Low Production Rates)

At low production rates, the dispenser “stages” baskets of fries. The basket cycle is similar to high production, the dispenser senses when the lower guide is full, and alters the cycle accordingly. The object is to have fries available as soon as possible in case of a sudden demand. To do this, the dispenser continues the cycle until there are three full baskets on the lower guide, one full basket in the lift, and one load of fries waiting in the accumulator doors. NOTE: The times given in the “Typical Time” column are based on typical AFD-280/U operations. The times given are cumulative, they are the time from the start of the cycle.

Typical Time

0 sec. Basket Removed from lower

2 sec. Lift down The lift down switch closes, indicating the lift saddle is down. From this point,

4 sec. Lift time-out If the lift down switch closes before 1.6 seconds, error #2 will occur. If the lift 5 sec. Guide sensor time-out If the guide sensor has not detected the basket, error #5 will occur. This

2 sec. Basket detected on lower

3.5 sec. Basket clears the lift The lift saddle goes up.

5.5 sec. Lift Up The lift up switch closes, indicating the lift saddle is up. The stopgate opens.

7.5 sec. Lift time-out If the lift up switch closes before 1.6 seconds, error #2 will occur. If the lift up

5.5 Basket Cycle Triggered A basket will not be filled unless the weigh cycle is completed and a basket is

7 sec. Basket Detected at lift The lift sensor detects a basket. The dispenser waits one second to ensure 8 sec. Basket Settled The stopgate closes. Between this time, and the time that the lift goes down,

Fries Ready When the weighing cycle has completed, the accumulator doors open and 10 sec. Fries Dispensed During this time, the dispenser ignores input from the lift sensor. If the guide

15 sec. Staging Time-out The accumulator doors close and the weigh cycle is triggered.

Event Response

When the guide sensor indicates that the lower guide is no longer full, the lift

guide

saddle goes down. This should take between 1.6 and 4.4 seconds, if it does

not, an error #2 or #3 will occur. During this time the dispenser ignores input

from the lift sensor.

if the lift sensor detects something, error #4 will occur. The accumulator

doors close, and the weighing cycle is triggered.

down switch does not close within 4.4 seconds, error #3 will occur.

usually indicates that the basket has stopped short of the sensor or is stuck in

the lift saddle.

The guide sensor detects the basket, the dispenser waits 1.5 seconds to

ensure the basket has cleared the lift saddle.

switch does not close within 4.4 seconds, error #3 will occur.

detected. The basket cycle may be triggered at any time (indicated by a

steady green light on the restart button), but will be immediately suspended

until this condition is met. During continuous operation, the basket cycle will

be triggered immediately when the lift is up.

the basket has settled into the lift.

removing the basket from the lift saddle will cause an error #4. The basket

usually enters the lift at about the time the weighing cycle begins. This can

vary considerably depending on the use of the dispenser. However, the

basket cycle can’t continue until a load of fries is ready. The following

timeline assumes that the weighing cycle started at the same time as the

basket cycle.

close twice, and then remain open.

sensor detects a basket, the lift saddle does not go down. The accumulator

doors remain open for 5 seconds then close, and the weigh cycle is triggered.

Continuous Dispensing

The AFD-280/U dispenser has two automatic mode settings, 1.0 lb.(450gm) And 1.5 lb.(700gm). In the continuous modes, a new basket cycle is automatically started at the end of each basket cycle. The green restart button is constantly lit.

Automatic cycling will continue until there are three filled baskets on the lower guide. The dispenser will automatically maintain three filled baskets on the lower guide. When a filled basket is removed, a new cycle will start to replace that basket .

AFD280, 280U Comprehensive Service Manual

Single Basket Mode

In the single mode, the dispenser will fill baskets only on demand. A basket cycle is initiated by pressing the green restart push-button. When pressed, the button will light and remain lit until the basket cycle is completed. Both the basket cycle and the weighing cycle are triggered by pressing the push-button. If the accumulator doors are empty, the dispenser will weigh a load of fries. From this point, the cycle proceeds normally; weighing the fries, filling the basket, and transferring them to the lower guide. When the lift reaches the bottom, a new weighing cycle is triggered. Unlike the continuous modes, when the lift reaches the top, the green restart light will go out and the basket cycle will stop. The weighing cycle will complete, but the new load of fries will be kept in the accumulator doors until the pushbutton is pressed again. This mode of operation is most useful during the slow hours of the day. It allows the crew to remove several of the baskets, and never have more than one load of fries “staged”.

Fries Low/Bridging

If the dispenser is unable to weigh a full load of fries within 40 seconds, the dispenser will give a “Low Fries” indication (Start/Reset push-button flashes slowly). The “Low Fries” indication can actually be caused by several conditions:

1. The most common condition is the hopper being empty, or nearly empty. In this case, refill the hopper with Frozen French Fries to resume operation.

2. Occasionally, an air pocket of fries can form around the dispenser drum. This can occur when fries above the drum lock together, forming a “bridge”. The drum then dispenses all the fries under the bridge, and is unable to dispense any more. Fry bridging is resolved by gently stirring the fries around by hand to collapse the bridge. Bridging of fries usually occurs when a large number of fries are kept in the hopper for several hours, and have been allowed to partially thaw.

3. The low fries indication can be caused by a mechanical failure of the drum, motor, weighing system, or a tripped circuit breaker.

When a “Low Fries” condition occurs:

1. The restart light will begin flashing slowly (about one flash per second).

2. The drum will stop turning.

3. A waiting basket will not be filled (even with a partial load of fries in the accumulator doors).

4. The lift will remain in the up position (a clear difference between a “low fries” and “error” condition). The drum stops for two reasons. First, to reduce the risk to the crew who will be refilling the hopper. Second, to minimize the wear on the motor. The dispenser will retry the weighing again in 90 seconds, this is to minimize crew interaction. The expected behavior when the hopper is empty; 40 seconds of drum turning, 90 seconds of drum halted, 40 seconds turning, 90 seconds halted, and so on.

After refilling the hopper, press the start/reset push-button and the following events occur:

1. The restart light will stop flashing.

2. There will be a two second pause (for load cell stabilization).

3. The weighing cycle will restart. Without pressing the start/reset button, the weighing process will automatically resume after a 90 second period. The restart light will stop flashing after the dispenser succeeds in receiving a full load.

Error Mode

There are several ways that the normal cycle can be interrupted. Each way represents something that will prevent the dispenser from functioning, or may present a hazard to crew or equipment. In these cases, when the dispenser detects such a condition, it will halt operation and allow the crew to correct the problem. The sequence when an error is detected is as follows:

The dispenser will remain in this mode until restarted. After the problem has been corrected, the dispenser can be restarted by pressing the restart push-button. The restart light will stop flashing, the lift will go up, and both the weighing cycle and basket cycles will resume.

NOTE: Should the restart button not stop flashing when pressed, the air present switch is not registering.

1. The restart light begins flashing quickly (about five times per second).

2. The error code appears on the Diagnostic display of the Controller Board (see next section).

3. The drum motor stops turning.

4. The stopgate and accumulator doors close.

5. The lift goes down.

In this case, the compressor system should be investigated. Error #1 should be displayed on the controller board.

AFD280, 280U Comprehensive Service Manual

The Diagnostic Displays

The AFD-280 controller has two displays that can be used to identify and correct most problems with the dispenser. These are the I/O Point LED’s (Light Emitting Diodes), and the Service interface. The displays are detailed in the following sections. Examples of their use appear in the sections on diagnosing problems with the different subsystems.

Input - Output LED Indicators

On the bottom and top of the controller are the inputs and outputs for the controller (In1, In2, Out1, Out2, etc.). The inputs are located across the bottom of the controller, and are numbered right to left. Each input is optically

isolated, and has an LED (Light Emitting Diode) connected to it. The LED is lit when the input is active. The outputs are located across the top of the controller, and are numbered right to left. Each output is optically

isolated, and has an LED connected to it. The LED is lit when the output is active. If an output LED is lit, and the corresponding device is not actuated, there is a problem with that device, with the

wiring, or with the controller’s driver circuit.

Output Connections Output LED’s

Input LED’s Input Connections

Refer to page 71 and 72 for a list of the input and output LED’s (Light Emitting Diodes) for each controller board used.

AFD280, 280U Comprehensive Service Manual

The Service Interface.

On the upper right corner of the controller circuit board is the service interface. The service interface consists of three LED alpha numeric displays and two push-buttons. The left push-button is called the “SELECT” function button, it is used to SELECT a function to be entered or cancel functions in progress. The right push-button is called the “ENTER” function button, it is used to ENTER a selected function. The Service Interface is illustrated below:

SELECT ENTE

The following sections discuss the operations of the service interface.

Power Up

During power up, the controller performs a display segment test. The display will briefly show all eights, as shown below, for this test. During the segment test the controller will also run a test on it’s memory and program. Should these tests fail, the controller will stop, leaving the segment test on the display. Normally, the segment test will flash briefly, then the normal operation display will appear.

Normal Operation

During Normal Operation, the display will show a series of horizontal bars, as shown below. This display indicates that all tests have passed, no errors have occurred, and no function is in use. If the controller does not give this display shortly after power up, there is a problem.

Error Mode

When an error occurs, the START/RESET button will flash rapidly (5 times per second) and the lift will go down. Normally, an error condition can be cleared by pressing the START/RESET button. If an error persists or occurs too often, you may need to know what error is occurring. When an error occurs, the center digit of the display is replaced with an error code. The example below is displaying error code 4.

Explanation of the error codes will be found in the troubleshooting section of this manual.

AFD280, 280U Comprehensive Service Manual

Selecting a Function

The controller has functions to observe, adjust and test the operations of the dispenser. Functions are accessed using the following procedure.

1. Press the “SELECT” function button the number of times as the function number desired. Each time you press the “SELECT” button the display will show the function code for the function that is ready to be “ENTERED”.

The example below shows Function 7 (decrease 1.0 lb (450gm). loads). The Function Button was depressed 7 times.

NOTE: If the display is left in the above mode, the display will return to Normal Operation after a few seconds. This is a safety feature to prevent functions from being selected by accident.

2. When the display shows the desired function number, press the “ENTER” button to enter the selected function.

Pressing the “SELECT” function button again will close the function. Pressing the “ENTER” function button again will advance the function to the next level of the selected

function. Further features of each function will be explained in the descriptions of the functions.

AFD280, 280U Comprehensive Service Manual

Function Reference for 1.0 software

Function List

The following is a complete list of the available functions.

Number Function Name Description

1 restart function Same as Restart Button on front panel. 2 display last error Shows the code for the last error that occurred. 3 weigh disable Toggles the weighing cycle on and off. 4 tare function Sets the default zero to the current A/D value. Be sure doors are empty. 5 calibrate Accepts a 1.0 lb (450gm). reference weight, and sets the 1.0 and 1.5 lb. targets. 6 adjust 1.0 up Adjusts the 1.0 lb (450gm). target upward in increments of 3 (about 1 oz.). 7 adjust 1.0 down Adjusts the 1.0 lb (450gm). target downward in increments of 3 (about 1 oz.). 8 adjust 1.5 up Adjusts the 1.5 lb (700gm). target upward in increments of 3 (about 1 oz.). 9 adjust 1.5 down Adjusts the 1.5 lb (700gm). target downward in increments of 3 (about 1 oz.). 10 watchdog test Locks up the program so that the watchdog timer fires. Invokes error #8. 11 load cell readout Displays the current reading from the load cell (live display). 12 actuate lift Moves the lift up and down. Displays the time in tenths of a second. 13 actuate doors Opens and closes the accumulator doors. 14 actuate stopgate Opens and closes the stop gate. 15 actuate drum Turns the drum motor on and off. 16 actuate light Turns the restart light on and off. 17 restore defaults Clears the error log and sets programmed default weighing parameters. 18 clear errors Clears the error log. 19 error counts Reads out the error log. 20 parameters Reads out the current calibrated weighing parameters.

Function 1 - Restart

Returns immediately to the normal display. This function serves the same purpose as the restart button on the front panel. Provides a means of restarting the dispenser from the back of the dispenser.

Function 2 - Display Last Error

Displays the error number of the last error. This allows the dispenser to be restarted after an error, and then find out what the error was while the dispenser is in service. Exit using either the select or enter button.

Function 3 - Disable Weighing

Pressing enter button immediately returns the display to normal. Turns the weighing process on and off. This is used for testing the mechanical systems. Inhibits the dispenser from dispensing and weighing fries. Commonly used for testing the mechanical systems, or diagnosing / calibrating the load cell. If weighing is not turned back on, it will be automatically restarted the next time the dispenser power is cycled.

Function 4 - Tare

Pressing enter button immediately returns the display to normal. Establishes a new zero point for the load cell. Before entering this function, be sure that the accumulator doors are empty. This can be accomplished by disabling the weighing (Function 3), and running a basket through to make the dispenser drop the fries into the basket.

Function 5 - Calibrate

NOTE: For accurate calibration, tare the weighing system (Function 4) before calibrating.

Displays the word “CAL” on the display. Clean off the accumulator doors and apply a 1.0 pound (450gm) reference weight (Four 1/4# Patties for example). Wait at least 10 seconds for the load cell to stabilize, then press the enter button again. The display will return to normal. This function uses the reading for the 1 lb (450gm) reference weight to calculate the target weights for the 1.0 lb (450gm) and 1.5 lb (700gm) loads.

Function 6 - Adjust 1.0 target upward

Displays the current target value for use when weighing 1.0 lb. (450gm) loads. The default value is 51. Pressing the enter button causes the value to increase by 3 each time it is pressed. This corresponds to approximately 1 oz. (25 gm). When the desired value is reached, press the select button to close the function.

AFD280, 280U Comprehensive Service Manual

Function 7 - Adjust 1.0 target downward

Displays the current target value for use when weighing 1.0 lb. (450gm) loads. The default value is 51. Pressing the enter button causes the value to decrease by 3 each time it is pressed. This corresponds to approximately 1 oz. (28 gm). When the desired value is reached, press the select button to close the function.

Function 8 - Adjust 1.5 target upward

Displays the current target value for use when weighing 1.5 lb. (700gm) loads. The default value is 77. Pressing the enter button causes the value to increase by 3 each time it is pressed. This corresponds to approximately 1 oz. (28 gm). When the desired value is reached, press the select button to close the function.

NOTE: Adjusting the target weight above 1.5 lb (700gm) is NOT recommended for proper cooking.

Function 9 - Adjust 1.5 target downward

Displays the current target value for use when weighing 1.5 lb. (700gm) loads. The default value is 77. Pressing the enter button causes the value to decrease by 3 each time it is pressed. This corresponds to approximately 1 oz. (28 gm). When the desired value is reached, press the select button to close the function.

Function 10 - Watchdog test

The controller has an internal timer that resets in the event that an electrical surge causes the controller circuitry to freeze. During normal operation, the controller program signals the timer several times per second to prevent it from firing. This function tests the timer by locking up the program so the watchdog timer fires. When this function is selected, nothing will happen for approximately

1.5 seconds, then the controller will reset. You will see the segment test flash by, and then display error #8 (Watchdog Timer Fired).

NOTE: This function causes a Watchdog Timer Error, and will be recorded in the error log. To prevent confusion, you may want to clear the error log (Function 18) after using this function.

Function 11 - Load Cell Readout

Displays the current load cell reading. This is the raw value (it is not compensated for any offset or calibration), and is used to test the load cell. This is a live display and changes constantly with the load cell input. The value should read between 30 -100. Pressing the select button closes the function.

Function 12 - Actuate Lift

Displays the time required for the last lift actuation in tenths of a second (e.g. 23 means 2.3 seconds). When this function is entered, the stopgate will close (to prevent baskets from falling). Each time the enter button is pressed, the controller will change the state of the output (L15) that drives the lift (if it is off it will turn it on, if it is on it will turn it off). After the lift completes it’s move, the display will change to show the time that the lift took for that actuation. This function is used to test the lift cylinder, lift cylinder switches, and to measure/adjust the lift speeds. If the dispenser is in an error condition this function will require the Start/Reset button to be pressed after entering this function. Lift cylinder speeds should be between 2.2 and 2.6 seconds. If the cylinder speeds are faster than 1.6 seconds or slower than 4.4 seconds, a system error will be generated.

Function 13 - Actuate Doors

Display remains “F13”. Each time the enter button is pressed, the controller will change the state of the output (L16) that drives the Accumulator Doors (if it is off it will turn it on, if it is on it will turn it off). This function is used to test the accumulator door cylinder, and adjust the accumulator door speeds.

Function 14 - Actuate Stopgate

Display remains “F14”. Each time the enter button is pressed, the controller will change the state of the output (L17) that drives the Stopgate (if it is off it will turn it on, if it is on it will turn it off). This function is used to test the stopgate cylinder, and adjust the stopgate speeds.

Function 15 - Actuate Drum

Display remains “F15”. Each time the enter button is pressed, the controller will change the state of the output (L10) that drives the Dispenser Drum Motor (if it is off it will turn it on, if it is on it will turn it off). This function is used to test the Drum Motor.

Function 16 - Actuate Light

Display remains “F16”. Each time the enter button is pressed, the controller will change the state of the output (L11) that drives the Restart Light (if it is off it will turn it on, if it is on it will turn it off). This function is used to test the Restart Light.

AFD280, 280U Comprehensive Service Manual

Function 17 - Restore Defaults

This function restores the 1 lb (450gm), 1.5 lb (700gm), and tare values to programmed default factory values. These will change when the Tare and Calibrate functions are performed (In fact they are preferred, as they will tailor your weighing parameters to your actual load cell instead of the defined “typical load cell”). This function is intended to be a general purpose function, which will restore the memory state of the dispenser to what it was when it was first powered on. This function also clears the error log. Function 20 will display the specific calibration values.

Function 18 - Clear Errors

This function sets each of the counts in the error log to zero. This can be done at any time, as it has no effect on any other operations. We recommend that this be done periodically to prevent records of occasional errors from building up (even a perfectly running dispenser will get occasional errors from improper handling) and confusing a service tech at a time when the error log could be useful. In any case, errors should be cleared after every service call to prevent the errors invoked during the call from causing confusion in the future.

Function 19 - Error Counts

Displays the word “Err”. Each time the Enter button is pressed, it moves to the next error count. When the last count is passed, the display returns to normal mode. The error counts are displayed in numerical order. Error number 9 is not included (error number 9 indicates a memory failure, and therefore renders any history meaningless). For example, if you saw this sequence of displays:

“Err” “ 0” “ 0” “ 1” “ 3” “ 2” “ 0” “ 21” “ 0” “---”

This would indicate that, since the last time the errors were cleared, there had been 1 error 3, 3 error 4’s, 2 error 5’s, and 21 error 7’s. This would indicate a problem with the lift up switch.

Function 20 - Parameters

Displays the word “Con”. Each time the enter button is pressed, it moves to the next weighing parameter. When all three parameters have been displayed, the display returns to the normal mode.

The weighing parameters are (in order of appearance):

1. The 1.0 lb (450gm). target: This is the number of digitizer steps equal to 1.0 lb (450gm). The default value is 51.

2. The 1.5 lb (700gm). target: This is the number of digitizer steps equal to 1.5 lb (700gm). The default value is 77.

3. Default tare: This is the value that the dispenser uses for zero when it first powers up. The default value is 77. If the load cell has been calibrated, or the loads adjusted, these may be slightly different. For details see the section on operation/calibration of the load cell.

AFD280, 280U Comprehensive Service Manual

Expanded Function Reference for 2.x software

The following is a complete list of the available functions.

Number Function Name Description

1 restart function Same as Restart Button on front panel. 2 display last error Shows the code for the last error that occurred. 3 weigh disable Toggles the weighing cycle on and off. 4 tare function Sets the default zero to the current A/D value. Be sure doors are empty. 5 calibrate Accepts a 1.0 lb (450gm). reference weight, and sets the 1.0 and 1.5 lb. targets. 6 adjust 1.0 up Adjusts the 1.0 lb (450gm). target upward in increments of 1 (about 1 oz./25gm). 7 adjust 1.0 down Adjusts the 1.0 lb (450gm). target downward in increments of 1 (about 1 oz./25gm). 8 adjust 1.5 up Adjusts the 1.5 lb (700gm). target upward in increments of 1 (about 1 oz./25gm). 9 adjust 1.5 down Adjusts the 1.5 lb (700gm). target downward in increments of 1 (about 1 oz./25gm). 10 watchdog test Locks up the program so that the watchdog timer fires. Invokes error #8. 11 load cell readout Displays the current reading from the load cell (live display). 12 actuate lift Moves the lift up and down. Displays the time in tenths of a second. 13 actuate doors Opens and closes the accumulator doors. 14 actuate stopgate Opens and closes the stop gate. 15 actuate drum Turns the drum motor on and off. 16 actuate light Turns the restart light on and off. 17 restore defaults Clears the error log and sets programmed default weighing parameters. 18 clear errors Clears the error log. 19 error counts Reads out the error log. 20 parameters Reads out the current calibrated weighing parameters. 21 adjust .75 up Adjusts the .75 lb (350 gm) target upward in increments of 1 (about 1 oz./25gm). 22 adjust .75 down Adjusts the .75 lb (350gm). target downward in increments of 1 (about 1 oz./25gm). 23 .75 control Changes the .75 lb (350gm).position from single to automatic. 24 bypass mode Used to temporarily bypass inoperative sensors or lift switches. 25 select units Select weight units; US or International. 26 exercise mode Used to “break in” replaced componets. 27 revision level Displays EPROM revision level. 28 segment test Verifies that all the display segments are functional.

Note: Functions that are the same as 1.0 software do not appear in this section.

Function 6 - Adjust 1.0 target upward

Displays the current target value for use when weighing 1 lb. (16 oz.), (450gm) loads (in ounces or grams, depending on units setting of F25). The default value is 16 oz. (450gm). Pressing the enter button causes the value to increase by 1 ounce (25gm) each time it is pressed. When the desired value is reached, press the select button to close the function.

Function 7 - Adjust 1.0 target downward

Displays the current target value for use when weighing 1 lb. (16 oz.), (450gm) loads (in ounces or grams, depending on units setting of F25). The default value is 16 oz. (450gm). Pressing the enter button causes the value to decrease by 1 ounce (25gm) each time it is pressed. When the desired value is reached, press the select button to close the function.

Function 8 - Adjust 1.5 target upward

Displays the current target value for use when weighing 1.5 lb. (24 oz.), (700gm) loads (in ounces or grams, depending on units setting of F25). The default value is 24 oz. (700gm). Pressing the enter button causes the value to increase by 1 ounce (25gm) each time it is pressed. When the desired value is reached, press the select button to close the function.

NOTE: Adjusting the target weight above 1.5 lb (700gm) is NOT recommended for proper cooking.

Function 9 - Adjust 1.5 target downward

Displays the current target value for use when weighing 1.5 lb. (24 oz.), (700gm) loads (in ounces or grams, depending on units setting of F25). The default value is 24 oz. (700gm). Pressing the enter button causes the value to decrease by 1 ounce (25gm) each time it is pressed. When the desired value is reached, press the select button to close the function.

AFD280, 280U Comprehensive Service Manual

Function 17 - Restore Defaults

Function 17 will reset the units to “US” units. If international units are preferred, Function 25 must be

Note: performed.

This function recalls the .75 lb./350 gm.,1 lb./450 gm., 1.5 lb./700 gm., and tare values to programmed default factory values. These will change when the Tare and Calibrate functions are performed. This function is intended to be a general purpose function, which will restore the memory state of the dispenser to what it was when it was first powered on. This function also clears the error log. Function 20 will display the specific calibration values.

Function 19 - Error Counts

Displays the “Err” when the function is first entered. Each time the Enter button is pressed, it moves to display the next error and counts. When the last error count is passed the display returns to the normal mode. The error counts are displayed in numerical order. Error 9 is not recorded. For example, if you saw this sequence of displays:

“Err” “1. 0” “2. 0” “3. 1” “4. 3” “5. 2” “6. 0 “7. 21” “8. 0”

This would indicate that since the last time the errors were cleared, there had been:

1 error #3, 3 error #4’s, 2 error #5’s, and 21 error #7’s.

Function 20 - Parameters

Displays the word “Con”. Each time the enter button is pressed, it moves to the next weighing parameter. When all parameters have been displayed, the display returns to the normal mode. The weighing parameters are (in order of appearance):

1. Switch position #1 target - the number of digitizer steps that represents .75lb/350gm. The default value is 38/39.

2. Switch position #2 target - the number of digitizer steps that represents 1.0lb/450gm. The default value is 51/50.

3. Switch position #3 target - the number of digitizer steps that represents 1.5lb/700gm. The default value is 77/78.

4. Default tare - the value that the dispenser uses for zero when it first powers up. The default value is 40/40 (30-100

acceptable). If the load cell has been calibrated, or the loads adjusted, these may be slightly different. For details see the section on operation/calibration of the load cell.

Function 21 - Adjust Switch Position #1 UP

Displays the current target value (in ounces or grams, depending on units setting of F25) for use when weighing 3/4 lb. (12 oz.), (350 gm) loads. The default value for switch position #1 is 12 oz. (350 gm.). Pressing the enter key causes the value to increase by 1 oz. (25 gm.), with each activation. When the desired value is reached, press the select key to close the function and set the value

Function 22 - Adjust Switch Position #1 DOWN

Displays the current target value (in ounces or grams, depending on units setting of F25) for use when weighing .75 lb. (12 oz.),(350 gm) loads. The default value for switch position #1 is 12 oz. (350 gm.). Pressing the enter key causes the value to decrease by 1 oz. (25 gm.), with each activation. When the desired value is reached, press the select key to close the function and set the value.

Function 23 - Position #1 Control Status

Entering this function displays “AU” or “SL”. The “AU” display indicates that switch position #1, .75lb. (350gm.) is set to function in the automatic mode just like the other two selector switch positions. Pressing the enter button will now toggle the display between “AU” and “SL”. When the display indicates “SL”, pressing the select button again will set the #1 selector switch position to single mode and close the function.

AFD280, 280U Comprehensive Service Manual

Function 24 - Bypass Mode Enable (volatile setting)

Entering this function the display will read either “nor” , Bypass mode disabled or “bYP”, Bypass mode enabled. When the Bypass mode is enabled the dispenser will ignore any error conditions and cycle in the single mode only. A basket will dispense each time the control panel reset button is pressed. The selector switch will select the load sizes in all three positions. This function is volatile, meaning that the bypass mode will disable when the power is turned off. This function is designed to allow usage of the fry dispenser even when there is a problem with a component or an adjustment until service can be performed on the dispenser. Bypass Mode is further identified by double flashing of the reset button.

Function 25 - Select Weight Units “US” or “In”

Entering this function permits selection of ounces or grams as the weighing units. Pressing the enter button will toggle the display between ounces “US” and grams “In” (international) for the weight units. Pressing the select button sets the displayed weight units for dispenser operations.

Function 26 - Exercise Mode (volatile setting)

When the dispenser is in the exercise mode, all systems will continuously cycle. The display will read out the lift speed each time the lift traverses. The exercise mode is designed to “break in” a replaced component and allow simple adjustments to the lift speeds. The exercise mode is volatile and will reset when the dispenser power is turned off.

Function 27 - Display EPROM Revision Level

Entering this function displays the revision level of the installed EPROM.

Function 28 – Segment Test

Verifies that all the display segments are functional. The display segments will illuminate in a moving display.

AFD280, 280U Comprehensive Service Manual

Error Definitions

When an error occurs, the light in the restart button begins flashing rapidly (about 5 flashes per second) and the lift goes down. In most cases, this signals the need for a minor adjustment or a component has been assembled improperly. If the cause is not immediately apparent, the error code can be read from the display on the controller. The error code will be displayed on the controller, unless a function is being used, until the restart button is pressed. If the restart button has been pressed, you can find out what the last error was by using the display last error function (Function #2). You can also look at the counts of the errors using Function #19 (this is useful if errors are occurring frequently).

NOTE: If no error is displayed, but the restart light is flashing slowly, the system is indicating that it is unable to achieve a full load of fries. This usually means that the hopper is empty. If it is not, refer to the section on diagnosing the weighing system.

The following table is a summary of the errors, below are detailed explanations of the errors and their possible causes.

Number Error Name Definition 1 AIR LOSS Operating Pressure has dropped below 20 PSI (1.4 BAR.) 2 LIFT SPEED The lift is moving too fast (time is less than 1.6 seconds) 3 LIFT TIME The lift is moving too slow (time is more than 4.4 seconds) 4 LIFT SENSOR An error has occurred involving the lift optical sensor. 5 GUIDE SENSOR An error has occurred involving the guide optical sensor. 6 LIFT DOWN SWITCH An error has occurred involving the lift down switch. 7 LIFT UP SWITCH An error has occurred involving the lift up switch. 8 WATCHDOG The watchdog timer fired (abnormal reset) 9 NVRAM Checksum error for the non-volatile storage.

If the display remains blank, or remains with all segments on (888), the EPROM and/or controller board is defective.

Error #1 - Air Loss

The Air Present Switch, located on the filter/regulator, is not registering (L6). Possible causes:

• The drain valve on the filter/regulator did not close properly, preventing the compressor from reaching operating pressure. If this occurs, the compressor will run continuously and air will be leaking from the drain tube beneath the dispenser. Clean or replace the water trap bowl.

• The filter/regulator water trap bowl is damaged. Replace the water trap bowl.

• The air present switch is set too high. The air present switch should be adjusted to close (L6 on) at 20 PSI (1.4 bar)

and open (L6 off) at 18 PSI (1.2 bar).

• There is an air leak in the dispenser plumbing, preventing the compressor from reaching operating pressure. If this occurs, the compressor will run continuously and you may hear air hissing from the site of the air leak.

• The pressure at the filter/regulator is set too low, below 20 PSI (1.4 bar). Operating pressure is 30 PSI (2.1 bar).

• Something is blocking the airflow in the air lines (debris or a kink in the line). Dispenser may operate intermittently.

Monitor the pressure gauge on the filter/regulator. If the pressure drops below 20 PSI (1.4 bar) during operation, this is a possible cause.

• The compressor pressure switch (mounted on the top of the air reservoir) is set too low. This can be checked by turning the filter/regulator adjustment knob fully clockwise. The filter/regulator pressure gauge is now monitoring pressure in the air reservoir. The compressor pressure switch should be set to turn on at 40 PSI (2.8 bar) and off at 60 PSI (4.2 bar). Adjust filter/regulator pressure to 30 PSI (2.1 bar) when complete.

• The compressor is not running. If the pressure in the reservoir is below 40 PSI (2.8 bar) the compressor should be running. If it is not, either the air compressor, the compressor pressure switch, or the AC wiring is faulty.

• The connection between the air present switch and the controller board is faulty. Verify wiring is not loose or damaged.

• The air present switch has failed. Adjust or replace the air present switch.

AFD280, 280U Comprehensive Service Manual

Error #2 - Lift Speed

The controller board has received a signal from lift up switch or lift down switch, after it has set the lift saddle in motion, but before it is expected. (Lift saddle cylinder speeds must be between 1.6 and 4.4 seconds).

Possible causes:

• The filter/regulator air pressure is set too high. Verify the filter/regulator gauge indicates 30 PSI (2.1 bar).

• The lift saddle speeds are too fast and an adjustment is required.

• The lift saddle is not installed.

• Manifold is Defective.

Error #3 - Lift Time-out

The controller board has set the Lift Saddle in motion, and not received a signal from the opposite end switch within

4.5 seconds. (Lift saddle cylinder speeds must be between 1.6 and 4.4 seconds). Possible causes:

• The filter/regulator pressure is set too low. Verify the filter/regulator gauge indicates 30 PSI (2.1 bar).

• The lift saddle cylinder speeds are too slow and adjustment is required.

• The upper guide is installed incorrectly (backwards), and is blocking the lift saddle.

• The lower guide is installed incorrectly.

• Something is blocking the lift saddle.

• A lift switch is improperly positioned or loose, preventing it from detecting the lift saddle cylinder.

This can be verified by looking at the inputs for the lift switches (L4 & L5) on the controller board.

• The connection between either the lift down, or lift up switch and the controller board is broken. Check for loose or damaged switch wiring.

• Either the lift down, or lift up switch has failed.

• Lift Saddle shoulder screws are damaged, missing or loose.

• The Lift Saddle Cylinder has failed.

• Manifold is defective.

• The lift cylinder airline is kinked.

Error #4 - Lift Sensor Error

The Lift Sensor is not properly detecting a basket with the lift saddle in the up position. Or the Lift Sensor is detecting a basket with the lift saddle in the down position.

Possible causes:

• Someone has bumped or removed a basket from the lift saddle during the basket cycle.

• The Lift Sensor has picked up a highly reflective object in the environment.

• Shortening on the lift sensor.

• The connection between the Lift Sensor and the Controller Board is faulty.

• Lift Sensor range needs adjustment.

• Incorrect baskets are being used.

• The Lift Sensor has failed.

+ 56 hidden pages

Automated Equipment LLC AFD-280, AFD-280U General Manual

Specifications and Main Features

Frequently Asked Questions

User Manual