Mettler Toledo 8146 User's & Technical Manual
8146
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
CAUTION
• • READ this manual before operating or
servicing this equipment.
• • 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.
• • ALWAYS take proper precautions when
handling static sensitive devices.
• • DO NOT connect or disconnect a load cell
scale base to the equipment with power
connected or damage will result.
WARNING
DISCONNECT ALL POWER
TO THIS UNIT BEFORE
REMOVING THE FUSE
OR SERVICING.
WARNING
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.
• • CALL METTLER TOLEDO for parts,
information, and service.
OBSERVE PRECAUTIONS
FOR HANDLING
ELECTROSTATIC
SENSITIVE DEVICES
CONTENTS
1.0 GENERAL DESCRIPTION ......................................................................................1
1.1 STANDARD FEATURES.....................................................................................................................1
1.2 OPTIONAL FEATURES ......................................................................................................................1
2.0 SYSTEM DESCRIPTION........................................................................................2
2.1 AUTOMATIC ZERO MAINTENANCE (AZM)..........................................................................................2
2.2 NORMAL AND EXTENDED ZERO CAPTURE.........................................................................................2
2.3 LOAD CELL EXCITATION (APPLICABLE WITH ANALOG PCB ONLY) .......................................................2
2.4 REDUCED EXCITATION VOLTAGE (APPLICABLE WITH ANALOG PCB ONLY)...........................................3
2.5 INITIAL AND SPAN (APPLICABLE WITH ANALOG PCB ONLY)...............................................................3
2.6 OVERCAPACITY..............................................................................................................................3
2.7 DIGITAL FILTERING..........................................................................................................................3
2.8 LINE SYNCHRONIZATION (LINE SYNC) (APPLICABLE WITH ANALOG PCB ONLY)...................................3
2.9 LINEARITY CONNECTION (APPLICABLE WITH ANALOG PCB ONLY) ......................................................4
2.10 ANALOG VERIFICATION .................................................................................................................4
2.11 POWER UP SEQUENCE..................................................................................................................5
2.12 DIGITOL ® LOAD CELL CABLE DISTANCES (APPLICABLE TO DWP44 PCB ONLY)..............................5
3.0 SPECIFICATIONS ................................................................................................6
3.1 ELECTRICAL AND PHYSICAL SPECIFICATIONS...................................................................................6
3.2 INTERNAL FUNCTIONS.....................................................................................................................8
3.3 DISPLAY FORMATS .........................................................................................................................9
3.4 KEYBOARD SPECIFICATIONS .........................................................................................................10
3.5 FACTORY NUMBER CONFIGURATION AND OPTIONS .........................................................................10
3.6 DATA INTERFACE..........................................................................................................................12
4.0 INSTALLATION INSTRUCTIONS...........................................................................13
4.1 PRELIMINARY INSPECTION............................................................................................................13
4.2 OPERATING VOLTAGE SELECTOR....................................................................................................13
4.3 PRELIMINARY CALCULATIONS (APPLICABLE WITH ANALOG PCB ONLY)............................................14
4.4 JUMPER DESCRIPTION AND RECOMMENDED SETTINGS ..................................................................18
5.0 PROGRAMMING PROCEDURE ............................................................................27
5.1 ANALOG SETUP AND CALIBRATION PROCEDURE .............................................................................28
5.2 DIGITOL ® SETUP AND CALIBRATION PROCEDURE..........................................................................37
5.3 SETUP AND CALIBRATION PROCEDURE FOR SINGLE CELL DIGITAL LOAD CELL SYSTEMS...................38
5.4 SETUP AND CALIBRATION PROCEDURE FOR T-LAN MULTIPLE DIGITAL LOAD CELL SYSTEMS..............41
5.5 SETUP AND CALIBRATION PROCEDURE FOR DIGITOL ® J-BOX.........................................................49
5.6 DWP44 GENERAL SETUP FOR ALL LOAD CELL TYPES......................................................................52
5.7 SETUP FOR PRINTER PORT AND 8146 OPTIONS..............................................................................55
6.0 INPUT/OUTPUT DESCRIPTIONS.......................................................................... 66
6.1 I/O CONNECTIONS........................................................................................................................66
6.2 PRINTER OUTPUT DESCRIPTION - I/O #1.........................................................................................76
6.3 DEMAND MODE OUTPUT ...............................................................................................................78
6.4 CONTINUOUS MODE OUTPUT.........................................................................................................78
6.5 USER DEFINED PRINT FORMAT.......................................................................................................80
6.6 REPORT OUTPUT FORMAT..............................................................................................................82
6.7 HOST COMMUNICATION INTERFACE DESCRIPTION - I/O #3 (OPTIONAL) ...........................................83
6.8 BAR CODE INTERFACE DESCRIPTION - I/O #2 (OPTIONAL)...............................................................93
6.9 SETPOINT INTERFACE DESCRIPTION - I/O #4 (OPTIONAL)................................................................96
7.0 PREVENTIVE MAINTENANCE..............................................................................98
7.1 REQUIRED TOOLS AND SUPPLIES...................................................................................................98
7.2 MAINTENANCE SCHEDULE.............................................................................................................98
7.3 CLEANING....................................................................................................................................98
7.4 TROUBLESHOOTING ......................................................................................................................98
7.5 ERROR CODES..............................................................................................................................99
8.0 GENERAL INFORMATION..................................................................................109
8.1 RECOMMENDED SPARE PARTS....................................................................................................109
8.2 CABLES AND MATING CONNECTORS............................................................................................109
8.3 ASCII Chart................................................................................................................................111
Reference Drawings 134382 - 8146 Block Diagrams
9.0 PARTS CATALOG..............................................................................................112
9.1 DESK MOUNT..............................................................................................................................112
9.1.1 ENCLOSURE AND LENSES.......................................................................................................... 112
9.1.2 REAR PANEL ................................................................................................................................. 113
9.1.3 DISPLAY PCB’S............................................................................................................................. 114
9.1.4 FRONT PANEL AND KEYBOARD................................................................................................. 115
9.1.5 TRANSFORMER AND HARNESS .................................................................................................. 116
9.1.6 PCB’S............................................................................................................................................ 117
9.1.7 POWER SUPPLY........................................................................................................................... 118
9.1.8 CARD CAGE .................................................................................................................................. 119
9.1.9 CHASSIS........................................................................................................................................ 120
9.2 WALL MOUNT.............................................................................................................................121
9.2.1 BEZEL AND LINE CORD............................................................................................................... 121
9.2.2 DATA DISPLAY PCB ..................................................................................................................... 122
9.2.3 FRONT PANEL AND KEYBOARD................................................................................................. 123
9.2.4 WT. DISPLAY PCB ........................................................................................................................ 124
9.2.5 PCB’S............................................................................................................................................. 125
9.2.6 POWER SUPPLY........................................................................................................................... 126
9.2.7 TRANSFORMER AND HARNESS .................................................................................................. 127
9.3 MISCELLANEOUS.........................................................................................................................128
9.3.1 KITS OF PARTS ............................................................................................................................ 128
9.3.2 MATING CONNECTORS, DESK..................................................................................................... 128
9.3.3 MATING CONNECTORS, WALL..................................................................................................... 128
9.3.4 INTERCONNECTING CABLES...................................................................................................... 129
1
1.0 GENERAL DESCRIPTION
The Model 8146 Electronic Digital Indicator is intended for use with both strain gauge load cell and
DigiTOL ® load cell scales. Units include a sixteen character dot matrix display PCB and up to four
weight displays. The 8146 is available in desk and wall mounting enclosures. Weight information is
transmitted to a printer or compatible accessory device in a bit serial ASCII code.
1.1 STANDARD FEATURES
• • Selectable full scale number of increments 1000, 1200, 1500, 2000, 2500, 3000, 4000, 5000, 6000,
8000, 10,000, 12,000, 15,000, 16,000, 20,000, 25,000, 30,000, 32,000, 35,000, 40,000, 45,000, 48,000,
and 50,000
• • Available in a desk mount, or a NEMA 4X, stainless steel wall mount enclosure
• • Automatic zero maintenance
• • Expanded AZM up to ± 10% of scale capacity
• • Digital filtering provides the ability to select one of four filtering rates for display and data output
• • Motion detection sensitivity is selectable from ±0.5 to ±3.0 increments over a period of 1-30
successive A/D updates
• • Display of pounds and kilograms simultaneously on single scale unit
• • Three-point linearization capability during scale calibration
• • Keyboard setup and calibration
• • Line sync capability
• • Weight summing, when more than one scale is configured
• • Operator programmable printer formats
• • Battery-backed RAM
• • Expanded zero push button range (2-20%) of full scale capacity
• • Alphanumeric keyboard with additional function keys
• • Rate of weight change display
• • Operator definable weight conversion factors
• • Non-volatile storage for ID’s, Tare Registers and Accumulators
1.2 OPTIONAL FEATURES
• • Additional scale(s) - Three additional scales may be added
• • Bar Code interface
• • Host communications interface
• • Serial Setpoint output up to 12 Setpoints
2
2.0 SYSTEM DESCRIPTION
This section of the manual describes the various operating features available for use in your installation.
2.1 AUTOMATIC ZERO MAINTENANCE (AZM)
The 8146 is equipped with an AZM feature. AZM is used to keep the instrument on zero in spite of small
weight changes on the platform. AZM corrections operate at a rate of approximately one minor
increment per second. The AZM range is selectable for either 2% or 10% of full scale capacity.
AZM may be disabled lin the setup procedure
2.2 NORMAL AND EXTENDED ZERO CAPTURE
The 8146 has a front mounted zero pushbutton which allows the operator to reset the scale to a zero
condition. The normal range of the pushbutton is ±2% of full scale capacity. The 8146 permits
increasing this capture range* to ± 20% full scale capacity.
The zero pushbutton may be disabled in the setup procedure.
NOTE: Increasing the zero capture range may conflict with Local and State Weights and Measures laws
when the 8146 is installed in a “Legal for Trade” installation.
2.3 LOAD CELL EXCITATION (APPLICABLE WITH ANALOG PCB ONLY)
The 8146 uses gated 15 VDC excitation for normal analog load cell excitation.
Each Analog PCB is capable of powering six 350-ohm load cells; however, the 8146 will power a
maximum of eighteen 350-ohm load cells per unit. Refer to the following chart for more information
regarding the maximum number of load cells per unit.
The maximum distance between the 8146 and the load cells is 500 ft using 16-gauge or 300 ft using a 20gauge load cell cable.
Reduced excitation voltage levels are also available for use in hazardous areas. Refer to the following
paragraph for a more detailed description of this reduced excitation voltage.
Per Analog PCB Per System
14-825 ohm cells 42-825 ohm cells
12-700 ohm cell 36-700 ohm cells
6-425 ohm cells 18-425 ohm cells
6-350 ohm cells 18-350 ohm cells
4-240 ohm cells 12-240 ohm cells
3
2.4 REDUCED EXCITATION VOLTAGE (APPLICABLE WITH ANALOG PCB ONLY)
Reduced excitation output versions of the Model 8146 are available in all models for us with Toledo
Intrinsic Safety Barriers. Contact Toledo Fast Factory for additional information. Reduced excitation
voltage is limited to +3 volts for plus excitation and -3 volts for minus excitation (6 volts p to p). Also
included in the reduced excitation voltage versions are sense-to-excitation-shunting resistors which
prevent excitation runaway in the event that these line connections open.
NOTE: The lower excitation voltage must be considered when calculating the microvolt per increment
build. This also limits the maximum full scale increments to 40,000 instead of 50,000.
2.5 INITIAL AND SPAN (APPLICABLE WITH ANALOG PCB ONLY)
The initial and span values are calculated during the scale’s calibration procedure.
The initial range is from 0 to 27 millivolts.
The span range is from 3 to 45 millivolts, based upon 15-volt load cell excitation.
2.6 OVERCAPACITY
Individual Scales: The weight display will blank and printing is inhibited when the weight on the scale is
five or more increments above full scale capacity.
Summed Scales: If any of the individual scales reach an overcapacity condition (as described above),
the summed display will show eight asterisks (SUM********lb). This display will also occur when
the summed total is greater than eight digits.
2.7 DIGITAL FILTERING
The 8146 is equipped with a multi-stage digital filter. By selecting the correct level of filtering required
for your installation, changes in weight caused by wind, liquids, or vibration may be filtered out allowing
the indication to stabilize.
As with all filtering, the higher the filtering rate the slower the display will respond to weight changes.
2.8 LINE SYNCHRONIZATION (LINE SYNC) (APPLICABLE WITH ANALOG PCB ONLY)
The line sync feature is used to eliminate any “crosstalk” on the load cell signal wires.
This “crosstalk” is typically caused by two or more load cell cables, operating at different frequencies,
being run side by side, such as in conduit. This normally results in a slowly changing weight display.
The compensation for this is that all excitation voltages may be sync’d to the AC power source by
means of line sync jumpers located on both the Analog PCB’s and the Power Supply PCB.
NOTE: Running load cell cable in a conduit with other cabling is not recommended.
4
2.9 LINEARITY CONNECTION (APPLICABLE WITH ANALOG PCB ONLY)
The 8146 has the ability to compensate for nonlinear weight readings. This is done by taking weight
readings at zero, half capacity, and full capacity. (Half capacity is defined as between 30 and 50% of full
capacity.) It is important to note that the closer to full scale capacity the test weights are to the actual
scale capacity, the more accurate the compensation will be.
Linearity correction may be disabled in the setup procedure.
2.10 ANALOG VERIFICATION
Analog verification is a test routine which is used to verify only the indicator’s electronic analog section.
It is not usable on scales which have initial weight values greater than 7.5 millivolts. The AV test is
performed automatically approximately every four hours with the display reading zero. The indicator will
display “AAAAAA” during the test.
The AV process is performed by injecting a known test signal at the output of the pre-amp section. The
resulting data is then compared to a value calculated during calibration. If the test data is within the
tolerance of the calculated value (show in the chart), the test is passed. If the test fails, the indicator
becomes inoperative until corrective action is taken.
Analog verification may be disabled in the setup procedure.
If Full Scale
Increments Are:
1000 ± 1.0 Increment 15000 ± 4.5 Increments
1200 ± 1.0 Increment 16000 ± 4.8 Increments
1500 ± 1.0 Increment 20000 ± 6.0 Increments
2000 ± 1.0 Increment 25000 + 7.5 Increments
2500 ± 1.0 Increment 30000 ± 9.0 Increments
3000 ± 1.0 Increment 32000 ± 9.6 Increments
4000 ± 1.2 Increments 35000 ± 10.5 Increments
5000 ± 1.5 Increments 40000 ± 12.0 Increments
6000 ± 1.8 Increments 45000 ± 13.5 Increments
8000 ± 2.4 Increments 48000 ± 14.4 Increments
10000 ± 3.0 Increments 50000 ± 15.0 Increments
12000 ± 3.6 Increments
Figure 2.1 Analog verification (AV) Test Tolerances
Acceptable
Tolerances
are:
If Full Scale
Increments are:
Acceptable
Tolerances
are:
5
2.11 POWER UP SEQUENCE
When the AC power is applied, the 8146 will perform a series of display routines. These routines will
check all display segments and inform the operator as to which software version he has and of any
options that are installed. The series of display are as follows:
WEIGHT DISPLAY - Will count up, starting at 1 and ending at 0.
DATA DISPLAY - Will show a series of numbers and then flash the unit’s configuration.
EXAMPLE - Scales 2
- Host Port
- Software Revision Number
At the end of this routine, the unit will be at the home position and ready to operate.
2.12 DIGITOL ® LOAD CELL CABLE DISTANCES (APPLICABLE TO DWP44 PCB
ONLY)
2.12.1 DigiTOL ® Bench Portable
300 ft. Maximum, 8146 to Scale
2.12.2 DigiTOL ® J-Box and Floor Scale
300 ft. Maximum, 8146 to Scale
2.12.3 DigiTOL ® Power Cells
900 ft. Maximum, 8146 to Scale
NOTE: See chart below for maximum distance the auxiliary power supply can be placed from the scale.
This chart is based on the use of Toledo Scale load cell cable 8 conductor, 20 gauge with
stainless steel sheath for lightning protection.
Cells Per Pit
Power Supply
4 900 ft. 6 ft.
6 775 ft. 125 ft.
8 585 ft. 315 ft.
10 470 ft. 430 ft.
12 390 ft. 510 ft.
NOTE: This chart is a reference to maximum distances, dependent on the number of load cells and the
gauge of cable used.
Maximum Distance
Scale to Auxiliary
Supply
Maximum Distance
Auxiliary Supply to
8146
6
3.0 SPECIFICATIONS
3.1 ELECTRICAL AND PHYSICAL SPECIFICATIONS
3.1.1 Environment
The 8146 will operate at temperatures from -10º C (14º F) to +40º C (104º F) with a noncondensing relative
humidity of 0 to 95%. The 8146 has a zero temperature coefficient of 0.1 µV/ºC typical., 0.15 µV/ºC
maximum and a maximum span temperature coefficient of 6 PPM/º C. (Applicable on unit the Analog
PCB installed).
The desk-type enclosure is ventilated and, therefore, restricted to office or light industrial applications.
The wall mount enclosure is rated NEMA 4X and is constructed from stainless steel and designed for
washdown environments.
3.1.2 Power Requirements
The 8146 can operate (by selection) at 120V, 220V or 240V AC. The voltage input tolerance is +10% to 15% of the selected AC voltage with a line frequency of from 49 to 61.5 hertz. Maximum power
consumption is 65 watts. Isolated power is recommended.
CAUTION!
ALL UNITS ARE SHIPPED FOR 120V AC OPERATION.
REFER TO SECTION 4.0 FOR ALTERNATE VOLTAGE
OPERATION.
3.1.3 UL and C.S.A. Standard
Materials, components, and electrical design comply with UL and C.S.A. standards and requirements
including grounding of all metal parts, fusing, etc.
3.1.4 FCC Regulations
The 8146 meets or exceeds the FCC conducted and radiated emissions requirements.
3.1.5 RFI Specifications
In environments where RFI radiation exists, use the stainless steel wall mount enclosure. This model
has been designed to greatly reduce the susceptibility to Radio Frequency Interference.
3.1.6 Appearance and Dimensions
Desk Mount - This unit is charcoal black in color with a blue-green display and green display lens. The
unit’s metal case is 7” (17.8 cm) tall, [8.8” tall (22.4 cm) with legs extended] X 17.25” (43.8
cm) wide X 17.75” (45.1 cm) deep.
Wall Mount - This unit is a stainless steel NEMA 4X enclosure with a blue-green display and green
display lens. The enclosure is 14.25” (36.2 cm) tall X 20” (50.8 cm) wide X 10.5” (26.7 cm)
deep.
7
3.1.7 Hazardous Areas
In locations classified as hazardous by the National Electrical Code (NED) because of combustible or
explosive atmospheres, special modules are required. Toledo Scale Intrinsic Safety Modules are
designed for use in NEC Class I, or Class II, Division I, Groups C, D, E, F, or G. These Intrinsic Safety
Modules may be used ONLY with specific versions of the 8146. DO NOT CONNECT INTRINSIC SAFETY
MODULE TO ANY OTHER VERSION OF THE 8146. Contact Toledo Fast Factory for additional
information.
3.1.8 8146 Wall Mounting Dimensions
Figure 3.1 Front View
Figure 3.2 Bottom View
8
3.1.9 8146 Desk/Rack Mounting Dimensions
Figure 3.3 Front View
3.2 INTERNAL FUNCTIONS
The 8146 contains the necessary electronics to calculate and display weight as well as the capability to
transmit data to a remote device.
Figure 3.5 Back View
9
3.3 DISPLAY FORMATS
3.3.1 Weight Displays
The weight display is a 7-digit vacuum fluorescent-type, 0.512 inches high with a lighted decimal point.
A lighted comma may be selected to replace the decimal point by inserting a jumper plug across two
pins located on the Weight Display PCB. (See Section 4.4.6.) The display also includes seven vacuum
fluorescent descriptors which are located underneath the digits. These descriptors are ZERO, LB, KG,
GROSS, NET, TARE, and SELECT. Their functions are as follows:
ZERO When illuminated, this indicates that the scale is on gross zero.
LB or KG Indicates the unit is in the pounds or kilogram mode.
GROSS When illuminated, this indicates that the displayed value is the gross weight.
Gross = Tare + Net
TARE When illuminated, this indicates that the displayed value is the tare weight.
Tare = Gross - Net
SELECT When illuminated, this indicates which scale has been selected for further operations.
The 8146 may have two Weight Display PCB’s installed -- with each Weight Display PCB having two 7digit displays. This allows the 8146 to display the weight on each of the four possible scales at the same
time. With only two scales, it is possible to display the Gross or Net and Tare of each scale.
3.3.2 Data Display
The data display is a 16-character alphanumeric, dot matrix type. The characters are 0.44 inches high.
This display is used to prompt the operator throughout the various operating sequences as well as
display the results of the operation.
Figure 3.6 Keyboard Layout
10
3.4 KEYBOARD SPECIFICATIONS
The keyboard is a 55-position, tactile feedback keyboard with the edge of each key raised. The keys are
arranged as follows:
A-Z Used to enter the appropriate character when prompted for an alphanumeric input.
0-9 Used to enter the appropriate digit when prompted for a numeric value.
Test Initiates the internal self-diagnostics. This routine will continue until the second
depression of the test key
Setup Used to enter setup mode in conjunction with setup lockout switch(es).
Edit This key is used to view or change the contents of the ID, CN, Time, Date, Stored Tare,
Subtotals and Totals data.
Basic ID Used to enter a 16-character identification.
Report Used to initiate report printing sequence
Setpt Used to view or change the value of any of the twelve setpoints.
ID Used to access the tare recall function, for stored weight operation.
lb/kg Used to alternate between the lb and kg display mode. This key may be disabled in the
setup procedure.
Sum Used in conjunction with a numeric key (1-4) to select the scales that are to be summed.
Also used in conjunction with the Select Scale key to select sum display of previously
entered scales.
Select Used in conjunction with a numeric key (1-4) to select a particular scale for subsequent
operations. Also used with the Sum key for recalling the summed weight to the
alphanumeric display.
Tare Used to initiate an autotare.
Clear Clears the tare applied to the selected scale. The operation of this key is dependent upon
the
Tare programming of the tare function.
Gross/Net Alternately selects between the gross and net display modes.
Clear Used to clear any erroneous entry of numeric data.
Print Used to initiate a data transmission through the printer interface.
Enter Used to terminate any entry.
Zero Used to zero the selected scale’s weight display.
3.5 FACTORY NUMBER CONFIGURATION AND OPTIONS
3.5.1 Configuration Chart
11
All factory numbers are configured with one Weight Display PCB. Scale interface kits are ordered as
options. (See chart below.)
Factory Number Mounting
8146-0022 Desk
8146-0032 Wall
Figure 3.7 Factory Number Configuration Chart
3.5.2 Options
Descriptions
Service
Part Number
Sales
Part Number
Analog Scale KOP, Desk 127480 00A 0917-0126
Analog Scale KOP, Wall 124781 00A 0917-0127
Dual Serial I/O KOP, Desk 127482 00A 0917-0128
Dual Serial I/O KOP, Wall 127483 00A 0917-0129
Rack Mount KOP, Desk *** 127484 00A 0917-0130
Additional Weight Display KOP,
134367 00A 0917-0174
Desk
Additional Weight Display KOP, Wall 134369 00A 0917-0175
Tool-Operated Zero Pushbutton KOP 128235 00A 0917-0137
Scale Channel KOP (Analog KOP) 134365 00A 0917-0173
Weight Display Lens KOP, Desk* 134373 00A 0917-0176
Weight Display Lens KOP, Wall * 134374 00A 0917-0177
DigiTOL ® Scale KOP, Desk ** 134361 00A 0917-0171
DigiTOL ® Scale KOP, Wall** 134363 00A 0917-0172
DigiTOL ® Scale KOP, Desk ** 0917-0179
DigiTOL ® Scale KOP, Wall ** 0917-0180
Figure 3.8 Factory Options Chart
NOTE(S):
* Weight 1, Tare 1, Weight 2, Tare 2
** DigiTOL ® Power Cells
*** DigiTOL ® Bench Portable and DigiTOL ® J-Box
**** Factory Installed Option - Not Available as Field Installed KOP.
12
3.6 DATA INTERFACE
3.6.1 Printer Output
The 8146 is capable of transmitting bit serial, ASCII coded, data stream at 300 to 9600 baud. 20mA
current loop, EIA RS232-C and EIA RS422 are all available as standard circuit types.
3.6.1.1 Demand Operation - 300 to 9600 baud
When a print command is received, either from the print key or an external “Print Demand” signal via the
host port, the 8146 will transmit a message which was formatted during the printer output setup
procedure. Transmission of a checksum character, as well as expanded print, is selectable in the same
setup procedure.
3.6.1.2 Continuous Operation - 300 to 9600 baud
Setpoint status is transmitted via serial port in an ASCII coded format. This format is compatible with a
Reliance Electric AUTOMATE 15 TM programmable controller. This allows a standard AUTOMATE 15 to
be used as a setpoint output controller. Communications are via a standard ASCII RS232 serial link, at
9600 baud, 8 data bits, 1 stop, no parity into the programming port on the AUTOMATE 15. The first 12
bits in the first I/O rail [0.00 through 0.13 (octal)] are assigned to setpoint outputs 1-12. The last output
rail (0.17) is assigned as a toggling watchdog bit, with state complimenting at each I/O update. The
other bits in the rail (0.14, 0.15, and 0.16) are allocated, but of indeterminate state. The AUTOMATE 15
may be programmed to use the setpoint bits as internal points, but MUST NOT ALTER THE OUTPUT
STATES. All other available I/O points (1.00 through 3.17) are usable to the AUTOMATE 15. Any digital
output module usable with the standard AUTOMATE 15 head may be used for setpoint control.
Automate head must have an address of 01, i.e., PCID = 1. Refer to Section 6.9 for a detailed description
of this output.
3.6.3 Bar Code I/O - Optional
This port provides a bi-directional, bar code interface. 20ma current loop and EIA RS232-C circuit types
are supported. Baud rates are selectable from 300 to 9600 baud. Refer to Section 6.8 for a more detailed
description. Bar Code output is available for use with the 8860 Thermal Label Printer.
3.6.4 Computer I/O - Optional
This port provides a bi-directional interactive computer interface. EIA RS232-C and 20 mA Current Loop
are available at 300 to 9600 baud. Refer to Section 6.7 for message format, content and protocol.
13
4.0 INSTALLATION INSTRUCTIONS
4.1 PRELIMINARY INSPECTION
4.1.1 Inspection of Outer Case
Inspect the outer case for loose or damaged parts. If any damage is found, immediately notify the
freight carrier.
4.1.2 Inspection of Instrument
Open the instrument and continue the inspection noting that all interconnecting harnesses are securely
fastened.
4.1.2.1 The desk unit is opened by removing the four screws (two on the top cover plate and two on
the rear panel) and slide the top cover plate towards the rear of the unit.
4.1.2.2 The wall mount is opened by flipping the wing-type handle of each fastener up and turning
them 180 degrees counter-clockwise. Loosen the hinge fasteners of the bottom of the unit last.
4.2 OPERATING VOLTAGE SELECTOR
The operating voltage selector is located on the rear panel for the desk mount and inside the enclosure
on the wall mount. Locate this selection switch and verify that the correct operating voltage is selected
for installation.
! CAUTION
DO NOT APPLY POWER TO UNIT UNTIL VOLTAGE
HAS BEEN VERIFIED AND POWER SELECTION HAS
BEEN MADE.
! CAUTION
BE CERTAIN POWER IS DISCONNECTED BEFORE
MAKING ANY ADJUSTMENT TO THE
TRANSFORMER FOR VOLTAGE CHANGES.
14
4.2.1 To adjust the voltage selection switch, loosen the two screws and slide the locking plate until the
correct voltage level is showing. Possible selections are: 120, 220, and 240 volts AC.
! CAUTION
IF THE OPERATING VOLTAGE IS CHANGED, BE
SURE THE FUSE IS REPLACED WITH A FUSE OF
THE CORRECT RATING.
120 VAC operation requires a 1.5 amp Slo-Blo Fuse
220 VAC operation requires a .75 amp Slo-Blo Fuse
240 VAC operation requires a .75 amp Slo-Blo Fuse
4.3 PRELIMINARY CALCULATIONS (APPLICABLE WITH ANALOG PCB ONLY)
Before connecting the 8146 to an understructure, it should be determined if the load cell(s) are of a size
that will work correctly with the instrument and platform. If it is a standard build, proceed with
installation of the scale. However, if it is a special build or a conversion of an existing mechanical scale,
the microvolt per increment should be calculated. After calculating the microvolt per increment build,
refer to the build charts to verify that the 8146 will operate correctly with this build.
4.3.1 To find the microvolt per increment build, you must first find the following items:
a) Scale capacity*
b) Increment size *
c) Number of load cells or total lever ratio
d) Load cell capacity
e) Load cell output rating in mV/V (millivolts per volt of excitation)
* in lb or kg depending on how the scale is to be calibrated and used.
4.3.2 Find the total load cell output in millivolts by multiplying the cell output rating* by the 8146
excitation voltage, 6 or 15 volts.*
NOTE: Toledo Scale load cells are 2mV/V. Other manufacturers’ load cells may be 1, 1.75, or
3mV/V. Standard excitation is 15 VDC, reduced excitation is 6 VDC.
4.3.3 Use the formula shown to calculate the microvolt per increment ratio.
IncrementSize TotalLoadCellOutput mV x
LoadCellCapacityxNumberofCells orLeverRate
4.3.4 Divide scale capacity by the increment size to determine the number of increments which will be
used.
4.3.5 The following microvolt chart shows the limits, in microvolts, for the number of increments used.
& ( )
( )
1000
The 8146 Analog PCB’s are designed to operate with a maximum microvolt input of either 30 or
45uV*. This selection is determined by the position of the W3 jumper located on the Analog PCB.
Verify the position of this jumper on all Analog PCB’s installed in your unit. It may be necessary
to change this jumper position to reach an acceptable microvolt per increment build on your
unit.
* The maximum microvolt input is found by multiplying the excitation times the millivolt
output rating of the load cell.
15
Number of Increments*** Minimum µV/INC** Maximum µ/V/INC*
1,000
1,200
1,500
2,000
2,500
3,000
4,000
5,000
6,000
8,000
10,000
12,000
15,000
16,000
20,000
25,000
30,000
32,000
35,000
40,000
45,000
48,000
50,000
3.0
2.5
2.0
1.5
1.2
1.0
0.75
0.6
0.5
0.375
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
38.0
31.7
25.3
19.0
15.2
12.7
9.5
7.6
6.4
4.8
3.8
3.2
2.5
2.4
1.9
1.5
1.3
1.2
1.1
0.95
0.84
0.80
0.76
* The 8146 cannot be calibrated on builds that are greater than shown for the maximum
µV/Increment.
** The 8146 should never be programmed to less than .3uV/Increment for multiple cell scales
(4 or more) and no less than 1.0uV/Increment for single cell scales.
*** The number of increments shown are the only selections which should be made. If these
limits are exceeded, the scale may not be stable.
16
Number of Increments*** Minimum µV/INC** Maximum µ/V/INC*
1,000
1,200
1,500
2,000
2,500
3,000
4,000
5,000
6,000
8,000
10,000
12,000
15,000
16,000
20,000
25,000
30,000
32,000
35,000
40,000
45,000
48,000
50,000
3.0
2.5
2.0
1.5
1.2
1.0
0.75
0.6
0.5
0.375
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
Figure 4.2 Microvolt Chart for Analog PCB With
Jumper W3 Set Between Pins 2 and 3 (30mV)
26.0
21.7
17.3
13.0
10.4
8.7
6.5
5.2
4.4
3.3
2.6
2.2
1.7
1.6
1,3
1.0
0.87
0.81
0.74
0.65
0.58
0.54
0.52
* The 8146 cannot be calibrated on builds that are greater than shown for the maximum
µV/Increment.
** The 8146 should never be programmed to less than .3 µV/Increment for multiple cell scales (4
or more) and not less than 1.0 µV/Increment for single cell scales.
*** The number of increments shown are the only selections which should be made. If these limits
are exceeded, the scale may not be stable.
17
4.3.6 Example of finding the µV/Increment build
Scale Capacity 5000 lb
Increment Size 1 lb
Number of Cells 4
Size of Cells 2000 lb
Cell Output Rating 2 µV/V
8146 Excitation 15 V
MODEL 2155
Step 1 Find the total load cell output in millivolts (mV).
2mV/V x 15V = 30mV
Step 2. Use the formula to find µV/Increment
1 lb x 30mV x 1000
2000 lb x 4
Step 3 Divide scale capacity by increment size to determine number of increments to be
programmed.*
= 3.75 µV/Inc.
50001lb
lb
Step 4 Check the Microvolt per Increment Chart to see if this build fits into the 5000 increment range.
If it does, this will be a satisfactory build and you can continue with the installation.
If it does not, do not continue with this installation until the problem is corrected.
= 5000 Increments
*
select the closest range from the chart, as only the values in the chart are legitimate builds.
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4.4 JUMPER DESCRIPTION AND RECOMMENDED SETTINGS
This section of the manual describes the function of the onboard jumpers and program switches as well
as their recommended settings for use in the Model 8146. Refer to the following paragraphs by
individual PCB to determine how the jumpers or switches are to be positioned. Selections shown are
the required settings for correct operation of the 8146 indicator.
4.4.1 CPU PCB
W1 - RAM Size
Pins 1 to 2 = 8K RAM
W2 - CTS Level for Connector ST2
Pins Connected = Inactive CTS
W3 - CTS Level for Connector ST3
Pins Not Connected = Active CTS
*Pins Connected = Inactive CTS
W4 - Battery Backup
Pins Connected = Battery Active
W5 and W6 - On-board Address Selection
Both of these jumpers must be set so that the pins are not connected.
W7 and W8 - Off-board Address Selection
Both of these jumpers should be installed between Pins 1 and 2.
S1-5
Pins connected = Clock Interrupt
S2-4
Pins Connected = Host/Bar Code Serial Receive Interrupt
S2-7
Pins Connected = Printer Serial Receive Interrupt
*Factory Setting
19
SWITCH 1-1 ON - For the first Scale Channel PCB in the unit
OFF - For the second Scale Channel PCB in the unit
1-2 MUST BE ON
1-3 MUST BE ON
1-4 MUST BE ON
1-5 MUST BE OFF
1-6 MUST BE ON
1-7 MUST BE OFF
SWITCH 2 ON (towards J4)
This switch on the first Scale Channel PCB will allow the setup
procedure to be accessed and calibration of the scales connected to
this PCB. This switch on the second Scale Channel PCB must be
turned ON to access the calibration procedure of any scales connected
to it.
OFF (away from J4)
W1 - PSEN
This jumper must be set so that the pins are connected.
W2 - EPROM Select
Pins 2 to 3 = High Memory Size
W# - CTS Enable
Pins are not connected = CTS Inactive
Prevents access to the setup and calibration procedures.
20
4.4.3 Analog PCB
W1 and W2 - Line Sync
* Pins Connected = AC Line Sync
NOTE: These jumpers must be positioned the same as Jumper W1
Pins not connected = Internal Sync
located on the Power Supply PCB.
W3 - Load Cell Output Selection
3mV/V - For use with 3mV/V load cell(s). This jumper must connect Pins 1 and 2.
2mV/V - For use with 2mV/V load cell(s). This jumper must connect Pins 2 and 3.
* Factory Setting
21
4.4.4 DWP44 PCB
Jumpers installed as follows:
W1 = OVER Pins 2 & 3
W2 = IN (shorting pins together)
W3 = IN for DWP44 #1
W3 = OUT for DWP44 #2
W4, W5, W6 & W8 = IN
NO Jumpers installed
W7, W9 thru W17 = OUT
W19 thru W27 = OU
Connector Usage Internal Harness
Part Numbers
J1 32 Pin TSM Bus Interface
TSM Back Plane
J2 T-LAN & High Speed
Multidrop DLC
J3 Single DLC or DigiTOL ®
J-Box
J4 Single DLC or DigiTOL ®
J-Box
134360 00A Desk
134375 00A Wall
134383 00A Desk
134384 00A Wall
134383 00A Desk
134384 00A Wall
J5 Dual Weight Display 128236 00A
J6 Auxiliary Power Input 118521 00A
22
4.4.5 Serial I/O PCB
W3 = Not Used
W4 = 1-2 All Options
W5 = 1-2 Host/Bar Code Only
W6 = Not Used
W7 = Not Used
Switch 1 for the Host and Bar Code Option (1), set switches as follows:
SW1- 1 OFF
SW1- 2 ON
SW1- 3 OFF
SW1-4ON
For the Setpoint Option (2), set switches as follows:
SW1- 1 ON
SW1- 2 OFF
SW1- 3 OFF
SW1-4ON
W1 - Timing Clock
This jumper should be installed between Pins 2 and 3.
W2 - External Device Interfacing (CTS and DSR)
For normal operation this should have two jumpers installed. These jumpers
should be installed across pins 1 and 2, and pins 4 and 5. Pin number 3 should
not be connected.
NOTE: 8146’s may contain 0, 1, or 2 Serial I/O PCB’s. Board (1) is used for the Host and
Bar Code options. Board (2) is used for the Setpoint option. Both are ordered as 917-0128 KOP, for desk units, or 0917-0129, for wall units, then configured using
SW1 as shown.
23
4.4.6 Dot Matrix Display PCB
W1 - Data Output Circuit Type
W2 - CTS Circuit Type
W3 - Test
Pins 2 to 3 = RS232-C Output
Pins 2 to 3 = RS232-C Output
Used to start the self test of the Display PCB. During this test any key
pressed will advance across the display. The pins should not be
connected for normal operation.
W4 - On-board ROM Enable
Pins Not Connected = On-board ROM
W5 - Chip Select
These pins must be connected
W6 - DSR Circuit Type
Pins 2 to 3 = RS232-C Input
24
4.4.7 Dual Weight Display PCB
W1 - Comma
Pins not connected = Decimal point on the display
Pins connected = Comma on the display
(Later versions have solder pads only).
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