Pennsylvania Scale Company 7500 Series User manual

Pennsylvania Scale Company
Model 7500 Scales
&
7500/4 Indicator
Operation
&
Calibration
Manual
Pennsylvania Scale Company
1042 New Holland Avenue
Lancaster PA 17601
For online interactive tech support or more information on Pennsylvania
Scale products, visit our website at www.pascale.com
Version 4.02
Revised September 3,2002

2
CONTENTS
7500 SERIES –OPERATIONS-SECTION 1
INTRODUCTION -4
INSTALLATION AND SET-UP 5
PLATFORM CONNECTION 5
DIAGNOSTICS 8
OPERATING
OPERATIONAL FEATURES 9
INTERNAL CONNECTORS 9
DISPLAYS AND INDICATORS 10
PUSH BUTTON FUNCTIONS 10
WEIGHING
WEIGHING WITHOUT TARE 11
WEIGHING WITH TARE 11
COUNTING
COUNTING WITHOUT SAMPLE UPDATE 12
COUNTING WITH SAMPLE UPDATE 12
BI-DIRECTIONAL SERIAL ASCII
COMMUNICATIONS CAPABILITIES 14
RS-232 CONNECTOR PIN-OUT 14
RS-232 COMMUNICATIONS PARAMETERS 15
COMMAND FORMATS 15
SCALE COMMANDS 16
SAMPLE COMPUTER PROGRAM 18
ERROR MESSAGE LIST 20

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CONTENTS (cont’d.)
7500 SERIES -PROGRAMMING/CALIBRATION
SECTION 2
INTRODUCTION 21
CALIBRATION 22
BUILDING A FORMATTED PRINT 30
FORMATTED PRINT CODES 31
COMMAND FORMATS 34
RS-232 SCALE COMMANDS 35
RS-232 CONFIGURATION 36
RS-232 PRINT CODES 37
RS-232 SERIAL INTERFACE 38
CALIBRATION COMMANDS 39
CALIBRATION EXAMPLE 41
“CAL” COMMAND 42
7500 SERIES –ADDENDUM –SECTION 3
INTRODUCTION 44
7500 AC/DC Operating Instructions 45
7500 Basis Weight Scale 47
7500M Money Manager Scale 48

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SECTION 1
INTRODUCTION
This manual covers the Operations and Programming/Calibration of the Pennsylvania
Model 7500 series scales and indicators.
The 7500 is designed to be simple and easy to operate. But has many features that make it
extremely versatile to use, such as:
ØStandard RS-232 Interface with a selectable output for communications with a
computer or printer
ØAdjustable response time
ØOptional remote displays
ØSingle board electronics for ease of servicing
ØSimple one button counting operation
ØWeight reading may be switched between two weighing units
In addition, the 7500 employs a digital calibration technique that allows calibration with the
keypad or through the RS-232 Interface. The calibration is designed to simplify matching the
scale to the requirements of your application.

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INSTALLATION and SET-UP INSTRUCTIONS (Scale Version)
The 7500 Series Scale has been packaged for shipment to ensure safe, damage-free arrival.
Please use reasonable care when removing the unit from the shipping carton and retain the origi-
nal packaging materials in case reshipment is required.
NOTE:TO PROTECT THE WARRANTY, FILL OUT AND RETURN THE
WARRANTY CARD AND THE SCALE CONDITION REPORT.
To prepare the 7500 for operation, follow the procedure outlined below:
1. After opening the shipping carton, remove the molded foam top from the carton. (On2# and
5# capacity scales, the platform is packaged on top of this foam. Remove it first and lay it
aside.)
2. Gently lift and remove the stainless steel platform cover only. (On 2# and 5# capacity
scales, the platform is packaged separately and does not need to be removed.)
3. Remove any options which may be packed with the scale.
4. Carefully remove scale from the packaging by grasping both sides of the base.
NOTE: DO NOT LIFT THE SCALE BY THE TOP SPIDER OR THE SUB-
PLATFORM ASSEMBLY.
5. Place the scale on a stable, level surface for operation.
6. Adjust the corner leveling feet until the level bubble indicatestheunitislevel.Firmlytighten
hex jam nuts on the leveling feet. (Any time the scale is relocated, it should be leveled.)
7. Remove the protective plastic wrap from the platform and place the platform on the spider.
To activate the scale, plug the line cord into any grounded 50/60 hertz 120 volt outlet.
The scale will first display the version number of the software installed followed by its
diagnostic countdown process. During this countdown, the display will show 9.9.9.9.9.9.
through 0.0.0.0.0.0., each number representing a self-diagnostic test which verifies scale
operation. If the scale should fail any of these tests the display will freeze on that number.

6
(The diagnostic failure may be bypassed by pressing the ZERO button.) The serial interface
on all models will also transmit the test numbers.
INSTALLATION AND SET-UP INSTRUCTIONS (7500/4 Indicator)
The 7500/4 Indicator has been packaged for shipment to ensure safe, damage-free arrival.
Please use reasonable care when removing the unit from the shipping carton, and retain the
original packaging materials in case reshipment is required.
NOTE: TO PROTECT THE WARRANTY, FILL OUT AND RETURN THE
WARRANTY CARD AND THE SCALE CONDITION REPORT.
The 7500/4 Indicator is designed to be used with a standard load cell type weighing
platform. This platform may have a 1, 2 or 3 mv/v sensitivity and a bridge resistance of 87 to
2000 ohms.
CONNECTING THE 7500/4 IN NON-WASHDOWN APPLICATIONS
All Pensylvania Scale non-washdownweighingplatformsareshippedwiththepropermating
connector and need only to be plugged into the round CPC style connector on the bottom of
the indicator.
If your 7500/4 indicator is to be attached to a platform of a manufacture other that
Pennsylvania, a mating CPC connector may be ordered and attached top the platform
cable.(This connector is available as a kit form your Pennsylvania distributor, order Part
Number 48445). Or you may follow the connecting instructions for washdown applications,
this will not require the CPC connector. The CPC connector wiring assignments are as
follows:
CONNERTOR PIN # FUNCTION
1 ……………………………. +Signal
2 ……………………………. -Signal
3 ……………………………. Ground
4 ……………………………. Key
5 ……………………………. -Sense
6 ……………………………. -Excitation
7 ……………………………. +Signal
8 ……………………………. +Excitation
NOTE: If a four wire hook up is used, short connector pins 7 and 8 together.

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CONNECTING THE 7500/4 IN WASHDOWN APPLICATIONS:
Open the 7500/4 enclosure by removing the screws holding on the back plate. Carefully remove
the back plate from the indicator. The main circuit board is mounted to the back plate. On the
main circuit board, locate the load cell terminal block labeled P11. A white dot on the circuit
board denotes the location of pin #1 on the terminal block. Insert the scale platform cable
through the watertight Heyco bushing supplied on the indicator housing and feed it up to the load
cell terminal block. Insert the wires from the load cell cable into the terminal block using a small
screwdriver to tighten the connection for each wire. The following chart shows the proper wiring
for the terminal block.
WIRE COLOR FUNCTION TERMINAL
(Pennsylvania Scale Platforms) LOCATION
GREEN + SIGNAL # 1
WHITE -SIGNAL # 2
SHIELD SHIELD # 3
------- ------- # 4
BLACK -SENSE # 5
BLUE -EXCITATION # 6
RED + SENSE # 7
BROWN (or ORANGE) + EXCITATION # 8
A four wire load cell hook up may be used but is not recommended. If a four wire hook up is
necessary, short the + EXCITATION to the + SENSE on the terminal block.
After attaching your 7600/4 Indicator to a platform, it may be activated by plugging the line cord
into any grounded 50/60 hertz 120 volt outlet (220 volts, if this option was ordered). The 7600/4
will begin a diagnostic countdown. During this countdown, the display will first show the
version number of the software, followed by 9.9.9.9.9.9. through 0.0.0.0.0.0. Each number
representing a self -diagnostic test to verify operation of important unit functions. If the indicator
should fail any of these tests, the display will freeze on that number. (A diagnostic failure may be
by-passed by pressing the CHECK button.)
The serial interface will also transmit thetest numbers. The following table lists each test and it
corresponding display.

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DIAGNOSTICS
DISPLAY DIAGNOSTIC FUNCTION
9.9.9.9.9.9. EPROM Checksum, light all LEDS
8.8.8.8.8.8. RAM check
7.7.7.7.7.7. No Test
6.6.6.6.6.6. Check switches not shorted
5.5.5.5.5.5. No Test
4.4.4.4.4.4. Check load cell excitation voltage
3.3.3.3.3.3. Analog verify (checks output
from analog to digital)
2.2.2.2.2.2. Load CFG EEPROM, test virgin,
checksum, initialize on error
1.1.1.1.1.1. Load CAL EEPROM, test virgin,
checksum, initialize on error
0.0.0.0.0.0. No Test
------Initializing system (may take
several seconds)
After the countdown is completed, the scale performs an initial zeroing of the system. No weight
should be on the platform at this time.
NOTE: Allow at least 20 minutes for initial warm-up and load cell stabilization.
If you have the scale version of the 7600, it will have already been calibrated at the factory. If
your 7600 is an indicator and was matched to its platform at the factory or by your distributor, it
is now ready for operation. If not, please refer to Section II of this manual, the "Calibration &
Programming", for instructions on matching and calibrating the system.

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OPERATION
OPERATIONAL FEATURES
The following features are available on the 7500 series.
Overload -If the weight exceeds 105% of full capacity, the scale will read out "OLOLOL",
meaning overload.
Underload -If the weight is below -3% of full capacity, the scale will read out "ULULUL",
meaning system underload.
Automatic Zero Tracking -Maintains the system zero to within +/-1/4 of the display
resolution (The resolution being the smallest increment the scale is programmed to read).
AZT increases the overall accuracy of the system by removing errors at zero caused by
accumulation of debris on the base/container or minor drifts in the electronics or load cell.
Four Selectable Sample Sizes -Four different sample sizes may be entered into the scale
memory during programming.
Sample Update -Piece weight accuracy may be improved after the initial sample by adding a
quantity of parts to the platform less then the original sample. When this is done the scale
will recalculate the piece weight, display the message "UPdAtE" for 2 seconds and then
return to the counting mode.
Disable Count -The counting mode may be turned off during programming, allowing the
7500 to be used as a weigh only indicator or scale. (Refer to the Calibration and
Programming Manual in Section 2 of this manual for further information.)
CONNECTORS
The following connectors may be accessed through the opening on the bottom of the scale
version, or internally on the 7500/4.
D-Subminiature Connector (9-pin)-Used with RS-232 Interface. (found on the inside of the
stainless steel models)
Remote Display Connector -Used to connect a remote display option to the indicator.
(found on the inside of the stainless steel models)

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DISPLAYS AND INDICATORS
Weight Display -Indicates weight when the scale is weighing. Indicates count when scale is in
the counting mode, and displays messages during calibration and sample set operations.
Zero Indicator -Illuminates when the weight is within +/-1/4 of the display resolution of
system zero.
Count Indicator -Illuminates when the scale is in the count mode.
Primary Weighing Unit Indicator -Illuminates when the weight displayed is in the primary
weighing unit.
Secondary Weighing Unit Indicator -Illuminates when the weight displayed is in the
secondary weighing unit.
PUSH-BUTTON FUNCTIONS
ZERO Push-button -Sets scale to zero, functions as a CONTINUE switch during the
self-diagnostic check. (i.e. If the meter stops at a diagnostic, check number. The switch
may be pressed to resume the count down).
SAMPLESET Push-Button -When being used as a counting indicator, this button enters the
scale into the sampling mode.
UNITS Push-button -Pressing this button cycles the scale between the Primary weighing
unit, the secondary weighing unit and the count mode. Pressing and holding this button for
four seconds will cause the current software version to be displayed.
PRINT Push-button -Transmits formatted print to any device connected to the RS-232
port. Holding this push-button for four seconds will access the count and RS-232
configuration modes. (Refer to the Calibration and Programming Manual for further
information.)