User Manual Mettler Toledo Model 8571
Read TM8571.PDF text version 8571 Technical Manual and Parts Catalog INTRODUCTION This publication is provided solely as a guide for individuals who have received METTLER TOLEDO Technical Training in servicing the METTLER TOLEDO product. Information regarding METTLER TOLEDO Technical Training may be obtained by writing to: METTLER TOLEDO Training Center P.O. Box 1705 Columbus, Ohio 43216 (614) 438-4400 METTLER TOLEDO RESERVES THE RIGHT TO MAKE REFINEMENTS OR CHANGES WITHOUT NOTICE. PRECAUTIONS READ this manual before operating or servicing this equipment. W A RNIN G ALWAYS REMOVE POWER and wait at least 30 seconds BEFORE connecting or disconnecting any internal harnesses. Failure to observe these precautions may result in damage to, or destruction of the equipment. DISCONNECT ALL POWER TO THIS UNIT BEFORE REMOVING THE FUSE OR SERVICING.
ALWAYS take proper precautions when handling static sensitive devices. W A RNIN G DO NOT connect or disconnect a load cell scale base to the equipment with power connected or damage will result. ONLY PERMIT QUALIFIED PERSONNEL TO SERVICE THIS EQUIPMENT. EXERCISE CARE WHEN MAKING CHECKS, TESTS, AND ADJUSTMENTS THAT MUST BE MADE WITH POWER ON. SAVE this manual for future reference. DO NOT allow untrained personnel to operate, clean, inspect, maintain, service, or tamper with this equipment. ALWAYS DISCONNECT this equipment from the power source before servicing.
CAUTION OBSERVE PRECAUTIONS FOR HANDLING ELECTROSTATIC SENSITIVE DEVICES CALL METTLER TOLEDO for parts, information, and service. GENERAL DESCRIPTION 1.1 FEATURES 1.2 STATEMENT OF PERFORMANCE 1.3 ACCURACY CONSIDERATIONS 2. SYSTEM DESCRIPTION 2.1 INTERNAL FUNCTIONS 2.2 DISPLAY 2.3 KEYBOARD 3. SPECIFICATIONS 3.1 ELECTRICAL 3.2 ENVIRONMENT 3.3 PHYSICAL 3.4 DATA INTERFACE 3.5 CONFIGURATION GUIDE (120 VAC) 4. INSTALLATION INSTRUCTIONS 4.1 SETUP PROCEDURE 4.2 PROGRAMMING PROCEDURE 4.3 JUMPER POSITIONING 5.
OPERATING INSTRUCTIONS 5.1 DISPLAY FORMAT 5.2 KEYBOARD OPERATION 5.3 INITIAL POWER-UP SEQUENCE 5.4 OPERATING SEQUENCES 1 1 1 2 2 2 2 3 3 3 4 4 5 5 5 5 6 16 16 16 17 18 18 5.5 OPERATING ZONES 5.6 AVERAGE PIECE WEIGHT ENHANCEMENT 6. OPTIONAL ACCESSORY INSTALLATION 6.1 SERIAL I/O KIT 6.2 REPLACEMENT BATTERY 7. SERIAL INPUT/OUTPUT DESCRIPTIONS (OPTIONAL) 7.1 DATA OUTPUT DESCRIPTIONS 7.2 DATA INPUT DESCRIPTION 7.3 INTERFACING 8. PREVENTIVE MAINTENANCE 8.1 REQUIRED TOOLS AND SUPPLIES 8.2 MAINTENANCE SCHEDULE 8.3 CLEANING 8.4 TROUBLESHOOTING 8.5 REPLACEMENT OF LOAD CELL 8.6 OVERLOAD STOPS 9. GENERAL INFORMATION 9.1 RECOMMENDED SPARE PARTS 9.2 ACCESSORIES 10. PARTS CATALOG 10.1 EXTERIOR (LOW CAPACITY) 10.2 EXTERIOR (High Capacity) 10.3 BOTTOM OF SCALE 10.4 PCB AND COVER 10.5 INTERIOR OF BASE 10.6 BATTERY OPTION PARTS LISTING 11.
INTERCONNECTING DIAGRAM 20 21 21 21 22 24 24 27 28 29 29 29 29 29 34 35 37 37 37 38 38 39 40 41 42 43 44 1. GENERAL DESCRIPTION The Toledo Model 8571 is a high resolution combination straight weigh/parts counter that is intended for applications that require simple, straight forward operation. The 8571 is suitable for single scale operations up to 100 ln capacity. A high resolution digital load cell is incorporated in the scale providing maximum sensitivity and accuracy for either parts counting or straight weighing. The six key keyboard minimizes operator confusion and intimidation. Basic function keys include: Tare, Sample, Clear, Zero, Recall, and Print.
The 7 segment, 7 digit liquid crystal display (LCD) shows either gross weight, net weight or piece count. Recall of percent accuracy, net weight and average piece weight (APW) is provided. The scale can be used to count parts that are removed form a container on the platter. The effect of piece weight inconsistency can be minimized using the average piece weight (APW) enhancement feature. As additional pieces (sample) are placed on the scale, the average piece weight is automatically recomputed insuring that a representative calculation is utilized to derive counts.
The Model 8571 is available with an optional compact battery that mounts inside the scale enclosure to provide up to 10 hours of portable operation. The battery can be easily accessed by removing a cover located on the back of the scale. An optional RS232 (bidirectional) I/O features is available for printer or computer interface.
1.1 FEATURES Simplicity of Operation: Keyboard operation is simplified to increase operator efficiency and decrease costly mistakes. A single press of the SAMPLE key accesses the counting mode. Highly Visible LCD: Liquid crystal display includes 0.7 inch high digits for count or weight indication. Power consumption is minimized for applications that require the portable battery feature. Keyboard Setup and Calibration: allows scale programming including calibration to be completed in virtually minutes saving time and associated installation expense.
Selectable Sample Reference: Reference quantities for average piece weight calculation can be selected through the keyboard. A sample quantity ranging from 5 to 100 pieces can be used to derive a consistently accurate APW. Automatic Average Piece Weight (APW) Enhancement: If selected, the scale automatically recalculates APW continuously up to 4% of rated capacity. Optional Battery: Makes the self-contained scale ideal for applications that require portability. The internal battery provides up to 10 hours of power and can be easily changed or removed via an access cover located on the back of the scale. The battery is recharged when the scale is connected to an AC power outlet. 1.2 STATEMENT OF PERFORMANCE The performance of any count-by weighing scale is dependent on uniformity of weight per piece, number of pieces in the sample, individual piece weight and the percent of rated load placed on the scale.
In application, count accuracy is also depended upon the ability of the operator to read and record the count information accurately. This high resolution counting indicator significantly reduces count errors induced by the operator. In most applications, it provides better practical accuracy than either hand counting or using mechanical techniques. Assuming proper capacity selection, count accuracy of +/- one part is attainable in many specific cases.
However, the most significant variable is uniform weight of the parts to be counted. This variable is not controllable by the scale system. 1.3 ACCURACY CONSIDERATIONS Counting accuracy is determined primarily by these factors: 1.3.1 1.3.2 Digital resolution of the sample weight. Piece to piece weight variation. Item 1 is the most frequent cause of parts counting inaccuracy because of the user's desire to count and handle the minimum number of sample pieces. For example, with a sample weight of 0.02% of full scale, sample weight resolution is +/- 1.0% at best.
Use of the 0.1% or 0.05% minimum sample weight will significantly improve counting accuracy. Item 2 is not under control of the parts counter, but is a factor which merits serious attention by the user.
The overall count accuracy can be no better than the piece to piece variation, and may be much lower if the sample is not representative of the average piece weight. SYSTEM DESCRIPTION The 8571 Main PCB provides a DC supply voltage to the digital load cell which responds with numeric values proportional to the weight applied to the platter. This weight information is then used to determine the average piece weight and corresponding piece count. Operational parameters and calibration are accessible via the front keyboard so no internal access is required.
These values are stored in non-volatile ROM (Read Only Memory) so they will not be lost during a power outage. 2.1 INTERNAL FUNCTIONS The 8571 Main consists of three major blocks. These are: 1. Digital Load Cell Communicates bidirectionally with the Main PCB to determine weight applied to the platter. Main PCB - Contains the main power fuse and all operating power supplies as well as all logic functions, keyboard interface and setup storage. Display PCB - This LCD seven digit display is the visual interface between the electronics of the Main PCB and the operator. 2.2 DISPLAY The 8571 utilizes a low power custom liquid crystal display (LCD).
Depending upon which mode the scale is in, different legends will be shown. A sample display is shown below.% ACCY NET APW BAT LOW 8.8.8.8.8.8.8. PCSIbkg Sample Display 2.3 KEYBOARD The keyboard of the 8571 is simplified to reduce operator confusion and possible error.
The six keys located on the keyboard are Zero, Tare, Sample, Print, Recall and Clear. The keys are arranged as shown. Zero Tare Sample Print Recall Clear r 3.
SPECIFICATIONS 3.1 ELECTRICAL 3.1.1 Power Requirements The 8571 operates at 120 VAC (+10%, -15%) and 60 Hz). Power consumption is approximately 3.5 watts. A 220 VAC/50 Hz version is available as an option. The line voltage must be within these specifications and voltage measured between neutral and ground at the power outlet should be less than 0.1 VAC. The power line for the 8571 must not be shared with equipment that generate line noise (such as motors, relays, heaters, etc.). If adverse power conditions exist, a power line conditioner may be required.
Standards Materials, components and electrical design comply with U.L. Standards and requirements, including grounding of all metal parts, fusing, etc. 3.1.3 FCC Regulations The 8571 meets or exceeds the FCC conducted and radiated emissions requirements. 3.1.4 Radio Frequency Interface This unit is not intended for use in environments where a high concentration of RFI is present.
3.1.5 Battery Power Option The AC power required for charging is 7 watts. The charger output is 13.8 VDC at 400 mA. Main PCB power consumption is 12 VDC at 30 mA.
The normal cycle time for the battery is 10 hours of scale operation then 14 hours of charging. This is done by plugging the scale into an AC power outlet and leaving the power switch on the side of the unit turned off. NOTE: Battery charging will occur during AC power operation but at a reduced rate due to reduction of the charging voltage. 3.2 ENVIRONMENT 3.2.1 Temperature Sensitivity Zero temperature coefficient is 60 PPM/0C maximum.
Span temperature coefficient is 30 PPM/0C maximum. 3.2.2 Operating Temperature The Model 8571 is operable from 320F (00C) to 1040F (+400C) at 5 to 95% relative humidity, non-condensing. 3.2.3 Application 1. The 8571 is intended for use in a general purpose atmosphere.
It is intended for indoor applications where dirt, oil or water is not present. The 8571 is not designed for hose-down applications. Typical examples of misapplication of the scale include, but are not limited to: a).
Immersions Hosedown splashing liquids Corrosive chemical environments 2. Toledo Scale manufactures other scales that are suitable for 'hosedown' applications. 3.2.4 Hazardous Areas In locations classified as hazardous by the National Electrical Code (NEC) because of combustible or explosive atmospheres, special precautions are required.
DO NOT USE THE 8571 IN THESE LOCATIONS. 3.3 PHYSICAL 3.3.1 Appearance and Dimensions The Model 8571 is fog white with a black platter assembly and multi-color keyboard.
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The unit is 5.4' (134mm) high, 14.7' (374mm) wide and 14.6' (370mm) deep. The 8571 weighs approximately 20 lbs (9.1 kg). 3.3.2 Construction The base and sub-platter are made from die cast aluminum. The unit utilizes a Moment Insensitive Load Cell.
The cover, bezel, and platter are made of heavy structural plastic. A level bubble is mounted in the cover, requiring only removal of the platter for viewing.
3.3.3 Platform Size The 25, 50 and 100 pound capacity scales use a platter that is 14.5' wide (371mm) and 10.8' deep (273mm). The 5 and 10 pound units include 8' X 8' platform. 3.3.4 Shipping Information Approximate shipping weight is 22lb, carton dimensions are 9' X 19' X 19'. 3.4 DATA INTERFACE An optional kit is available to provide capability of bidirectional RS-232-C communications. The baud rate is selectable from 300 to 9600 baud and parity is selectable as even, odd or always a '0'. All data will be in 11 bit frame - 1 start bit, 7 ASCII coded data bits, 1 parity bit and two stop bits. When a print command is received, either from the PRINT key or an external 'P' character, the 8571 will output a message as formatted by setup selections.
Transmissions of a checksum character is selectable as is expanded print format. Scale motion, expanded print format. Scale motion, expanded display mode, under zero or over capacity operation will disable a print command. 3.5 CONFIGURATION GUIDE (120 VAC) Avoirdupois Indication 5 X 0.0005 lb 10 X 0.001 lb 25 X 0.002 lb 50 X 0.005 lb 100 X 0.01 lb Metric Indication 2 X 0.0002 kg 5 X 0.0005 kg 10 X 0.001 kg 20 X 0.002 kg 50 X 0.005 kg Load Cell Capacity 3.75 kg 7.5 kg 15 kg 30 kg 60 kg Factory Number 8571-0002 8571-0003 8571-0004 8571-0005 8571-0006 The 220 VAC versions are designated by the factory number 8571-001X, where the 'X' may be a 2, 3, 4, 5, or 6 as shown above. INSTALLATION INSTRUCTIONS To unpack and setup the 8571, use the following procedure. 4.1 SETUP PROCEDURE 4.1.1 Examine the shipping box for any sings of damage. IF DAMAGE IS FOUND, MAKE A CLAIM WITH THE CARRIER IMMEDIATELY.
Open the box, remove the scale and place the scale on a flat level surface. 4.1.2 CAUTION: Do Not lift the sale by the platter or sub-platter. Grasp the scale by the base to lift.
4.1.3 On 5 pound capacity scales (8571-0002 and 8571-0012), steps 3.1 through 3.4 must be followed. On all other 8571's these steps are not required - proceed to step 4. Remove the rubber band securing the 8' square plastic platter to the sub-platter. Grasp the plastic platter by the edges and lift straight up to remove it. The platter is held by loop and hook strips in the corners. Remove the two 8-32 screws and rubber 0-rings form the top the sub-platter.
See Figure 1. Remove the tape and shim form the top of the right side of the dead-deck. See Figure 1. Skip the following step 4. 4.1.4 4.1.5 Remove the platter by lifting upward and locate the level bubble. Level the scale by turning the adjustable feet on the bottom of the scale base in or out.
The feet should be adjusted so the scale does not rock. The correct position of the level bubble when the 8571 is level is shown in Figure 2. INCORRECT BUBBLE IS NOT CENTERED CORRECT BUBBLE IS CENTERED Figure 2 4.2 PROGRAMMING PROCEDURE This section of the technical manual describes the programming of the operating modes and features of the 8571, as well as the calibration.
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Sample displays are given to show the programming prompts. Described under each sample display are possible selections and the effect these selections will have on the unit's operation. The following front panel pushbuttons perform the specified functions when in the programming mode. PRINT Depressing this pushbutton will accept the displayed programming parameter and proceed to the next prompt.
Depressing this pushbutton will change the state of the displayed programming parameter and proceed to the next prompt unless otherwise stated. Depressing this pushbutton will enable the programmer to back-up tho the previous prompt. Depressing this pushbutton will cause the unit to bypass any other programming parameters an advance to the Set OFF prompt at the end of the programming setup. TARE - ZERO - CLEAR - The following chart can be used as a quick reference for programming descriptions. Also listed is the recommended selection for each step as a beginning point for initial setup. Verify each selection, such as calibration in pounds to be certain it coincides with actual usage before attempting calibration.
STEP F1 F1.1 F1.2 F1.3 F1.4 F1.5 F1.6 F2 F2.1 F2.2 F2.3 F2.4 F2.5 F2.6 F2.7 F3 F3.1 F3.2 F3.3 F3.4 DESCRIPTION OPERATIONAL FUNCTIONS Auto Clear Tare Auto Clear APW Sample Enhance Fixed Sample Size Enable Operator Setup Reset Setup Parameters UNIT FUNCTIONS Sample in APW oir Pcs./Wt. Miniiumum Sample Auto Sample Acceptance Tare Active% Accuracy Recall Enable Operate in Pounds Variable Sample Select CALIBRATION Expanded Weight Display Configure Scale? Capacity Select & Calibration Auto Zero Maintenance Enable. Program as required U.S.A.
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