Page 1
MODEL 7550
In Motion
Conveyor Scale
INSTALLATION MANUAL
Page 2
UNITED STATES
This equipment has been tested and found to comply with the limits for
a Class A digital device, pursuant to Part 15 of the FCC Rules. These limits
are designed to provide reasonable protection against harmful interference
when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not
installed and used in accordance with the instruction manual, may cause
harmful interference to radio communications. Operation of this equipment
in a residential area is likely to cause harmful interference in which case the
user will be required to correct the interference at his own expense.
CANADA
This digital apparatus does not exceed the Class A limits for radio noise
emissions from digital apparatus set out in the radio Interference Regulations of the Canadian Department of Communications.
Le present appareil numerique n’emet pas de bruits radioelectroniques
depassant les limites applicables aux appareils numeriques de la Class A
prescrites dans le Reglement sur le brouillage radioelectrique que edicte par
le ministre des Communications du Canada.
CAUTION
Risk of electrical shock. Do not remove cover.
No user serviceable parts inside. Refer servicing to qualified service personnel.
Weigh-Tronix reserves the right to change
05/30/01 PN 7424-16952A Printed in USA
specifications at any time.
Weigh Bar® and Harmonizer™ are registered trademarks of Weigh-Tronix, Inc.
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TABLE OF CONTENTS
7550 Description ....................................................................................... 1
Installing the Conveyor Scale ...................................................................... 2
WI-127 Indicator Introduction ..................................................................... 7
WI-127 Specifications ................................................................................. 9
Error Messages ........................................................................................ 11
Service Menu Structure ............................................................................ 12
Calibrating the WI-127 ............................................................................. 13
WI-127 Assembly and Disassembly ......................................................... 18
Viewing and Setting Time and Date........................................................... 19
WI-127 In-Motion Software ...................................................................... 20
7550 Operation ......................................................................................... 23
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7550 Description
Description
The Weigh-Tronix conveyor scale is a freestanding, self-contained and
self-powered, flat-belt weighing system that can be incorporated into
new or existing production facilities. The scale operates while the
conveyor is in motion and is intended for the weighing of individual
boxes, cartons or packaged products. It is ideally suited for shipping
applications.
This manual covers the installation and setup of the conveyor. Specific
information on the operation of the Weigh-Tronix indicator with the
conveyor scale can be found in this manual.
Weight Indicator
127 indicator in a NEMA-IV stainless steel housing for washdown
environments.
Weight Capacity – 150 lb x .1 lb
Construction Materials
steel model for general industrial applications.
The conveyor scale uses a USDA approved acetal polymer, flush grid
belt. The belt material is very durable and has excellent wear and friction
characteristics. The grid pattern results in a 31% open area which
facilitates cleaning procedures. Since the belt is made of individual
strips, damaged portions of the belt can be replaced quite easily. This
eliminates the need to replace an entire belt if only a small area is
damaged.
– The conveyor scale comes equipped with the WI-
– The conveyor scale is available as a carbon
Motor Size
motor. The standard motor uses a 115VAC, 60Hz, single phase motor.
Belt Speed – A variable speed control unit provided with this conveyor
scale requires a 115VAC, 60Hz, single phase power supply. It rectifies
the current from AC to DC to drive a DC motor. The control unit is
equipped with a rheostat that allows the belt speed to be regulated
between 0 fpm and 150 fpm.
Options
1
Belt Size
36", in 6" increments are available.
Height Adjustment – Three height range options are available: 18" to 28,"
27" to 37," and 36" to 46." You can raise or lower the unit in 1/32" inch
graduations.
– The conveyor belt is driven by a 1/3 horsepower electric
– Belt lengths of 36", 48", and 60" are available. Widths of 18" to
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Features
The scale component of the conveyor scale is suspended by means of
chains from four Weigh Bars.
box which is connected to the scale indicator by an interface cable. The
chain link suspension of the belt assembly allows some movement, thus
helping to absorb the adverse effects of vibration or jolts. The scale also has
four overload stops that help prevent damage to the Weigh Bars.
The conveyor scale has two NEMA IV rated photoelectric eyes, and two
reflectors—one at each end of the scale. When the product to be weighed
enters the scale, it breaks the beam of the first photocell. As soon as the
product clears the first photocell, the indicator starts recording weight
readings until the product breaks the beam of the second photocell. Once
the second beam is broken, the indicator averages the recorded weights
and transmits this average to the computer. This weight averaging technique results in much more accurate weighments. Weigh-Tronix conveyor
scales are accurate to within ±.1% of scale capacity provided the entire
item being weighed remains on the scale for at least one second.
®
The Weigh Bar outputs feed into a junction
Installing the Conveyor Scale
Installation
Recommendations
Lift each corner of the belt assembly and remove the shipping material
under each overload stop. The following recommendations will prevent
problems which can affect weighing performance. They are not intended to
replace or suggest that local or national electrical codes be ignored or
deviated from.
Orientation – The conveyor belt must travel in the right direction for the
conveyor scale to function properly. Be sure the belt moves towards
the end where the electric motor is located.
pushed rather than pulled which causes the belt to run less smoothly,
noisier, and will reduce the weighing accuracy achievable by the conveyor
scale system.
Height – The height of the conveyor should be adjusted such that the
conveyor height is the same as the entrance conveyor and the exit conveyor.
This should be done as accurately as possible to ensure as smooth a
transition as possible.
Motor Connections – The motor is part of the “live” part of the scale so
the electrical connection to the motor can have a significant impact on the
weighing performance. Avoid very short or very rigid connections.
If not, the belt will be
Photocell Programming – The photocells used on the conveyor scale
have programming modules in them, and the entrance photocell is programmed differently than the exit photocell. The entrance photocell is
programmed to trigger only after the back edge of the item clears the
entrance photocell. The exit photocell is programmed to trigger as soon as
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the front edge blocks it. See Figure 2 for photocell module proper programming information. Typically, if they are not programmed properly, the
system will weigh properly when tested statically, but the weights will be
light when weighing in motion. Photocell operation can be tested by
blocking the entrance photocell and then clearing the photocell path. The
indicator should not begin averaging (WI-127 will go to dashes) until after
the photocell is cleared. The exit photocell should cause the indicator to
display the averaged weight as soon as it is blocked.
Checking Scale Function
Photocell Synchronization –
powered up, or the entrance photocell has been triggered withoutpowered up, or the entrance photocell has been triggered without
powered up, or the entrance photocell has been triggered without
powered up, or the entrance photocell has been triggered withoutpowered up, or the entrance photocell has been triggered without
the exit photocell being triggered, the system needs to bethe exit photocell being triggered, the system needs to be
the exit photocell being triggered, the system needs to be
the exit photocell being triggered, the system needs to bethe exit photocell being triggered, the system needs to be
synchronized. This is done by momentarily blocking the exitsynchronized. This is done by momentarily blocking the exit
synchronized. This is done by momentarily blocking the exit
synchronized. This is done by momentarily blocking the exitsynchronized. This is done by momentarily blocking the exit
photocell. If you do not do this, the first item through willphotocell. If you do not do this, the first item through will
photocell. If you do not do this, the first item through will
photocell. If you do not do this, the first item through willphotocell. If you do not do this, the first item through will
resynchronize the indicator, but that weight will not be averagedresynchronize the indicator, but that weight will not be averaged
resynchronize the indicator, but that weight will not be averaged
resynchronize the indicator, but that weight will not be averagedresynchronize the indicator, but that weight will not be averaged
or transmitted.or transmitted.
or transmitted.
or transmitted.or transmitted.
The conveyor scale should be checked for weighing accuracy after it is
installed. Follow these procedures to check the weighing accuracy.
DO NOT RUN THIS TEST WITH THE BELT RUNNING.
1. Power up the indicator and press ZERO…
"O"
is displayed on the indicator.
2. Place a test weight not greater than 25% of scale capacity on a
corner of the conveyor belt.…
Weight is displayed on the indicator. Check this for accuracy.
3. Repeat step two for all four corners. There are three possibilities:
..
A
. The four weight readings are identical and correct.
..
B. The four weight readings are identical and incorrect.
C. The four weight readings do not agree.
Whenever the indicator is firstWhenever the indicator is first
Whenever the indicator is first
Whenever the indicator is firstWhenever the indicator is first
If A occurs, the scale is ready for use.
If B occurs, recalibrate the indicator following the instructions in the
indicator calibration section (Calibrating the WI-127) of this manual.
If C occurs, proceed to step 5 under Balancing Weigh Bars Routed
Through a Junction Box, then repeat this test.
Operating the
Conveyor Scale
3
1. Power up the conveyor scale…
Make sure all portions of the system are working properly,
especially the two sensors.
2. Power up the indicator and press ZERO
"0"
is displayed on the indicator.
3. Start the conveyors leading to and from the scale…
Material should move toward the scale.
4. Material passes entry photocell…
Dashes are displayed while weighing is in process.
……
…
……
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5. Material breaks beam of exit photocell…
Weight is displayed and transmitted to a peripheral device.
Balancing Weigh Bars
Routed Through a
JunctionBox
Figure 1
Weigh Bar J-Box
This scale uses a junction box (J-Box) where the outputs of multiple Weigh
Bars of matching capacities are added together. The J-Box then sends a
single signal to the indicator. These multiple signals must be balanced for
the scale to function properly. This is done at the factory, but these
instructions are provided in case they are needed. Figure 1 illustrates the
type of J-Box in the conveyor scale. Each potentiometer affects one weight
sensor. Balance the weight sensors by adjusting potentiometers in the JBox as follows:
1. Remove J-Box cover to access potentiometers.
2. Use R1 to set the zero value required by the indicator.
3. Use a test weight that does not exceed the capacity of one weight
sensor, usually 1/4 scale capacity, and obtain a displayed weight
value for the test weight applied to each weight sensor in the scale
system, like this:
R1-Course Zero
R2-J2 R3-J3
R4-J4 R5-J5
a. Place certified test weight directly above first weight sensor.
b. Record displayed weight value.
c. Remove test weight and verify the display returns to zero before
reloading another weight sensor.
d. Repeat Steps a through c for each weight sensor in the scale
system.
4. If displayed weight value for any weight sensor varies from the others
by less than ±1 division, proceed to calibration of the WI-127 if
necessary.
5. If displayed weight value for any weight sensor varies from the others
by more than ±1 division, adjust J-Box potentiometers by turning them
the number of 360° turns indicated by this formula:
Certified Test Weight Value - Displayed Weight Value
Certified Test Weight Value x 0.0028
= Number of Turns
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If Number of Turns is positive value, turn potentiometers
clockwise. If Number of Turns is a negative value, turn potentio-
meters counterclockwise.
6. Repeat Steps 3a through 3c, checking all weight sensors with test
weights, to make sure you have properly adjusted J-Box
potentiometers.
If displayed weight value for any weight sensor varies from the
others by more than ±1 scale division, then repeat Steps 3 through
5 until you achieve equal readings.
Photocell
Programmable
Modules
Figure 2
Photocell Module
Programming
IMPORTANT: If you have a photocell with a
Series B2 designation on the cover label, be
sure to use the appropriate illustration of your
module.
The photocells contain programmable modules. Remove the back cover
of the photocell case. The programming switches on the modules need
to be positioned correctly for the photocells to function properly. See
Figure 2 for programming switch positions. R1 and R2, as seen in Figure
2, are one-turn potentiometers. Turn them as labeled for proper
function. (CCW means fully counterclockwise and 50% means turned
halfway between the fully CCW and fully CW positions, etc.)
Use the first set of illustrations in Figure 2 if you have the original (nonB2 series) photocell. Use the second set of illustrations if the photocells are
the Series B2 type. Note that the only difference between the two types is
the position of switches 7 and 8. Switches 1-6 remain the same.
Optional DC Motor Speed
Control Wiring
5
Below are diagrams for wiring the optional speed controller to the DC motor.
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WI-127 In-Motion Wiring
When installing the WI-127, the power socket
outlet must be nearby and easily accessible.
Model 7550 System
Wiring Diagram
The wiring information to connect a WI-127 indicator to the photocell is
shown below.
Wire Color WI-127 Function
Green
Red TB14-1 +22 VDC Power
Black TB14-6 & TB15-9 Logic Gnd
Green TB15-7 Reset input (entrance trigger)
TB15-8 Set input (exit trigger)
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WI-127 Indicator Introduction
Figure 3
WI-127 Front Panel
The WI-127's front panel consist of 24 keys and 14 annunciators.
Keys
The WI-127's keys are divided into four primary groups:
Standard Scale Keys
weighing applications and include SELECT, TARE, PRINT, ZERO, and
UNITS.
SELECT
modes. SELECT can also be used to accept a current selection and
return to weighing mode from within any menu.
TARE
configured to accept values entered through the numeric keypad.
PRINT – Used to initiate manual data transmission.
ZERO – Zeros the scale in the display mode. Also clears values in
numeric entry.
UNITS – Switches the units of measure in the display mode. Up to
three units of measure are selectable.
– –
– Used to switch between the gross, tare, and net display
– –
– –
– Enters a push button tare in the display mode. Can be
– –
– –
– These yellow keys are common to a majority of
– –
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Operation of these keys changes with the
software installed in the WI-127 (standard,
in-motion).
Function Keys – These oval keys along the right side of the display face
are configurable and are labeled F1, F2, and F3. The default configurations
for these keys are:
F1 Accesses tare registers
F2 Views and edits ID
F3 Accesses cutoff registers
Keypad Keys
entry. The keyboard keys are labelled 0-9, plus/minus (+/-), and decimal
point (.) and are located near the center of the display face.
Directional Keys – The directional keys are used to navigate through the
WI-127's menus. These keys are labeled ESCAPE (up), ENTER (down),
(left), and MENU (right) and are positioned in a compass-like
!
cluster on the display face. These directional keys are denoted by the small
transparent arrows located next to them. ESCAPE, ENTER, and
also support numeric entry.
ESCAPE – Exits a menu parameter without saving any changes.
ENTER – Used to end digit entry, accept a change made, or select an item
from a function list.
– Backspaces (deletes the last digit or punctuation mark entered)
!
while in numeric entry and moves left within a menu.
MENU – Accesses menus and moves right within a menu.
– These are the twelve square keys which support numeric
!
Annunciators
The WI-127 has fourteen annunciators.
GROSS
TARE
NET
LB, KG, OTHER – Illuminates the active unit of measure in weighing mode.
PRINT
ZERO
MOTION
motion window).
UNDER, ACCEPT, OVER, CUTOFF, ID
annunciators.
– Illuminates when indicator is in gross weighing mode.
– Illuminates when viewing tare values in the various tare registers.
– Illuminates when indicator is in net weighing mode.
– Illuminates when the indicator is transmitting data.
– Illuminates when the scale is within the configured center of zero.
– Illuminates when the scale detects motion (within configured
– Specific application
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WI-127 Indicator Specifications
Indicator Specifications
Power Requirements:
115 Volts AC, +10% to -15% @ 0.3Amp maximum
Excitation:
10 Volts DC
Supports up to twelve 350-ohm weight sensors
Operational Keys:
Five yellow standard scale keys: Zero, Tare, Print, Units, Select
Four directional keys: Escape, , Menu, Enter
Three function keys: F1, F2, F3
Numeric keys: 0-9
Operational Annunciators:
Gross, Tare, Net, Print, Zero, Motion
Under, Accept, Over, Cutoff, ID,
Three units of measure
Display:
Eight digit, seven segment, 0. 8-inch high LED
!
Display Update Rate:
Selectable (1, 2, 5, 10) Per Second
Analog to Digital Conversion Rate:
60 times per second
Unit of Measure:
Independently programmable:
Pounds, kilograms, user selectable
Capacity Selections:
150 lb x .1 lb
Programmable Selections:
Zero range, motion detection, automatic zero tracking, five-point
linearization.
Time and Date :
Battery backed up real time clock is standard
HarmonizerTM Digital Filtering:
Fully programmable to ignore noise and vibration
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Standard Inputs:
Seven configurable logic level inputs for functions such as PB tare, print,
zero, units, select, gross, net, entrance and exit photoeye.
Standard Outputs:
Three outputs, open collector design
Relay power supply, 24 VDC at 150mA
Bi-directional serial port (RS-232 or RS-422/485 or
20mA current loop)
Serial Command Inputs:
Programmable serial response to ASCII character input
Self Diagnostics:
Display, keys, inputs, outputs, serial port,
A to D converter, load cell output display, voltages
Circuitry Protection:
RFI, EMI, and ESD protection
Operating Temperature:
-40 to 140° F (-40 to 60° C)
100% relative humidity including washdown
Enclosure:
NEMA 4X stainless steel enclosure
Dimensions:
12" W x 8" H x 4" D (without mounting bracket)
12.3" W x 11.0" H x 5.3" D (with mounting bracket)
Weight:
12.5 lb, 5.7 kg
Agencies:
NTEP Class III/IIIL:10,000d, COC #96-140.A1
Consumer and Corporate Affairs, Canada, #AM-5167
UL/CUL/CSA
FCC Class A
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Error Messages
The following are displays you may see if problems occur, or if invalid
operations are attempted with your WI-127:
Display Description
O.LoAdO.LoAd
O.LoAd
O.LoAdO.LoAd
_ _ _ _ __ _ _ _ _
_ _ _ _ _
_ _ _ _ __ _ _ _ _
– – – – –– – – – –
– – – – –
– – – – –– – – – –
Overrange weight
Underrange weight
Recovering from lockup or out of range condition
Loc' upLoc' up
Loc' up
Loc' upLoc' up
L.C. ErrorL.C. Error
L.C. Error
L.C. ErrorL.C. Error
Can'tCan't
Can't
Can'tCan't
FlashingFlashing
Flashing
FlashingFlashing
* *
*
* *
SealedSealed
Sealed
SealedSealed
Auto. 0Auto. 0
Auto. 0
Auto. 0Auto. 0
Lo. VoltLo. Volt
Lo. Volt
Lo. VoltLo. Volt
A-D converter is not functioning
A-D converter subjected to an input signal
beyond ±5 mV/V
The unit cannot perform a function. Displayed
only while key is held down.
Corrupted data in the reset menus. See the
Reset Menu/Master Clear section. (* = RESET,
SETUP, or CAL).
Displayed while a key is pressed when attempting to
modify a sealed selection without edit privileges.
Displayed while waiting for a stable, valid weight to
use as a zero reference on power-up.
Displayed when input voltage to excitation regulator
drops below 10.5 VDC. Will clear when input voltage
rises above 11.5 VDC.
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Service Menu Structure
Moving through the Menus
Figure 1
Directional key
Configuring, calibrating and testing of the WI-127 is done using a menu
structure which you move through using a directional key menu structure on
the front panel. The directional keys are shown below:
▼▼
▼
▼▼
ESCAPE
▼
▼▼
▼▼
▼
▼▼
▼▼
▼▼
▼
▼▼
ESCAPE
ENTER
▼▼
▼
▼▼
MENU
ENTER
▼▼
▼
▼▼
Press this key to exit a menu parameter without
saving any changes. Use to move “up” in the
menus.
Press this key to end digit entry, accept a change
made, or select an item from a function list. Use
to move “down” in the menus.
▼▼
▼▼
▼
Accessing the
Service Menu
Press this key to access menus. Use to move
MENU
▼
▼▼
▼▼
ESCAPE
Entering the service menu disables all standard outputs and inputs, and
disables the serial output.
To enter the service menu structure, key in the default password (127) then
press and hold the ESCAPE key for two seconds. If you do not know the
password, you may remove the nylon plug on the back of the WI-127 and
press the SEAL switch inside. If you do not want to make any changes in
the service menu but want to view the items, enter the menu without keying
in a password.
If the password has been changed, enter the current password instead of
the default.
“right" in the menus.
▼▼
▼▼
▼
Press this key to backspace (deletes the last digit
entered) while in numericentry. Use to move “left”
in the menus.
The display should show "ABOUT." This is the first item in the menu
structure.
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You may exit the service menu and return to weight display mode at any time
by pressing SELECT.
Exiting the
Service Menu
Warning:
If you do not press
displayed, none of your configuration
changes will be saved.
SELECT SELECT
SELECT with
SELECT SELECT
"SAVE""SAVE"
"SAVE"
"SAVE""SAVE"
If changes are made to the menu, the indicator will display "SAVE" (asking
you if you wish to save your changes) before returning directly to weight
display mode.
SETUPSETUP
SETUP
SETUPSETUP
NONO
NO
SAVESAVE
SAVE
SAVESAVE
1. To exit and save menu changes:
With "SAVE" displayed, press SELECT
The indicator will return to weight display mode and the
changes are saved.
2. To exit without saving changes:
With "SAVE" displayed, press ESCAPE…
With "SAVE" displayed, press MENU
"NO SAVE"
Indicator returns to weight display mode without saving any
changes.
is displayed, then press SELECT
NONO
SAVESAVE
SAVE
SAVESAVE
……
…
……
……
…
……
……
…
……
Calibrating the WI-127
Any changes made within the Calibration
Menu will be immediately implemented.
While in the Calibration Menu, you may print
the calibration data out of port #1 by
selecting YES from the "Print" menu.
13
The WI-127 allows calibration using up to five calibration points. These
points can be any weight value in any unit of measure. Standard
calibration generally uses two calibration points; for linearization, more
than two may be used.
The 7550 Conveyor Scale comes from the factory with two calibration
points: 0 and 150 lbs. (These weight values may differ depending on your
unit of measure.) To perform linearization, insert more calibration points (up
to a total of five points). These points appear in a list and may be inserted
and deleted. The unit will order the points based on increasing count
• You can enter these values into a new indicator hooked up to the same
scale. This is useful if the old indicator needs servicing and a quick
turnaround is needed.
• Another benefit is the ability to enter the profile of a weight sensor
without having to calibrate the indicator conventionally.
Page 17
Entering the
Calibration Menu
To calibrate the indicator, you must enter the calibration menu. See note at
left before following these instructions:
Be sure the correct capacity and division sizes
have been selected before calibrating.
1. From weight display mode, key in the security code (default
code is 127)…
The code number is displayed.
2. Press and hold
"ABOUT" is displayed, or
3. Press …
"SETUP" is displayed.
4. Press …
"110" or "127" is displayed. Select "127."
5. Press …
"ADJUST" is displayed.
6. Press …
"POINTS" is displayed. You are now in the calibration menu.
To calibrate the scale using live weight calibration, follow these steps:
for two seconds…
Weight Calibration
To view or edit the weight in another
configured unit of measure, press the
UNITSUNITS
UNITS key at any time during calibration.
UNITSUNITS
If the scale is too unstable,
displayed for several seconds. Correct the
filtering and recalibrate.
Note: Pressing Escape any time "Busy" is
displayed, will abort the calibration and
the indicator will return to the previous
display.
"BUSY" "BUSY"
"BUSY" will be
"BUSY" "BUSY"
1. With "POINTS" displayed, press …
"A 0" is displayed. This is the zero calibration point.
2. To calibrate the scale’s zero point, press …
"CAL."
3. Remove all weight from the scale and press . . .
"BUSY"
a stable value, then "d 0" is displayed.
4. Press …
"A 0" is displayed.
5. Press . . .
"A 150.0"
Full capacity is factory calibrated at 1 mV/V input..
6. You may use 150 lbs to calibrate this point, or you may change the value
for this calibration point. To change this calibration point, key in the new
value now and press , or to use the current value, press
"CAL." is displayed.
is displayed.
is displayed momentarily while the unit obtains
is displayed. This is the full capacity calibration point.
…
14
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After the system is fully calibrated, write down
and save the COUNT values for each calibration point. If the indicator ever needs replacing
you can key these values into a new indicator
and be assured the calibration will be correct.
To exit back to normal weighing mode, press
SELECT SELECT
the
SELECT key to save changes.
SELECT SELECT
7. Place the appropriate weight calibration value on the scale and press
…
"BUSY" is displayed momentarily while the unit obtains a stable
value, then "d XXXX" is displayed.
8. Press . . .
"A XXXX" is displayed. The two standard calibration points have
now been calibrated using live weights.
9. Press SELECT
to save the calibration.
Count Calibration
To view or edit the weight in another
configured unit of measure, press the
UNITS UNITS
UNITS key at any time during calibration.
UNITS UNITS
To calibrate the scale using count calibration, follow these steps:
1. With POINTS displayed, press …
"A 0" is displayed. This is the zero calibration point.
2. Press …
"CAL." is displayed.
3. Press …
"COUNTS" is displayed.
4. Press …
Current count value is displayed. Press UNITS to view and edit
the count in mV/V.
5. Key in the count value for the zero calibration point…
"VALUE" is displayed.
6. Press …
Value is accepted and "COUNTS" is displayed.
15
7. Press . . .
"A 0" is displayed.
8. Press …
"A 150"
Full capacity is factory calibrated at 1 mV/V input..
9. You may leave this point at 150 lbs, or change the value for this
calibration point.To change this calibration point, key in the new weight
value and press ….
"CAL." is displayed.
10. Press …
""
"COUNTS
""
11. Press …
Current count value is displayed. Press UNITS to view and edit
the count in mV/V.
is displayed. This is the full capacity calibration point.
""
" is displayed.
""
Page 19
After the system is fully calibrated, write down
and save the COUNT values for each calibration point. If the indicator ever needs replacing
you can key these values into a new indicator
and be assured the calibration will be correct.
To exit back to normal weighing mode, press
"SELECT" "SELECT"
the
"SELECT" key to save changes.
"SELECT" "SELECT"
12. Key in the count value for the A XXXXX calibration point.…
"VALUE" is displayed.
13. Press …
Value is accepted and
14. Press
"A XXXX" is displayed. The standard two calibration points have
now been calibrated using count calibration.
15. Press SELECT to save the calibration.
…
""
"COUNTS
""
""
" is displayed.
""
Adding Calibration Points
You have the option of adding one, two or three additional calibration
points for linearization. You may add these points at the same time you
are calibrating the zero load and full capacity points. Points do not have
to be inserted in the correct order. The WI-127 will automatically order
the points based on count values.
To add linearization points:
1. With "A XXXX" displayed, press
"A __" is displayed.
2. Key in the calibration value for the new point…
"A XXXX" is displayed.
3. Press . . .
"CAL." is displayed.
4a.
To perform a live weight calibration:
1. Put the correct weight on the scale and press …
"BUSY"
a stable value, then "d XXXX" is displayed.
is displayed for at least ½ second while the unit obtains
+/-+/-
+/- …
+/-+/-
To exit back to normal weighing mode, press
the "SELECT" key to save changes.
2. Press …
"A XXXX" is displayed.
..
4b
. To perform a count calibration:
..
1. Press …
"COUNTS"
count in mV/V.
2. Key in the correct count and press …
"COUNTS" is displayed.
3. Press …
"A XXXX" is displayed.
is displayed. Press UNITS to view and edit the
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5. To add more calibration points, repeat steps 1-4 above.
Deleting Calibration Points
6. Press SELECT
There are two methods of deleting calibration points. NOTE: You may
not have less than two calibration points.
Method A:
1. With the point you wish to delete displayed…
"A XXXX"
2. Press ZERO…
Point is deleted.
Method B:
1. With the point you wish to delete displayed…
"A XXXXX"
2. Press . . .
"CAL." is displayed.
to save changes.
To exit back to normal weighing mode, press
SELECT SELECT
the
SELECT key to save changes.
SELECT SELECT
3. Press . . .
"COUNTS"
4. Press again. . .
"DELETE"
5. Press …
"NO"
6. Press …
"YES" "YES"
"YES" is displayed.
"YES" "YES"
7. Press …
The point is deleted and
displayed.
8. Press
SELECTSELECT
SELECT to save changes.
SELECTSELECT
is displayed.
is displayed.
is displayed.
"A XXXX" "A XXXX"
"A XXXX" (next calibration point) is
"A XXXX" "A XXXX"
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WI-127 Assembly and Disassembly
Follow the instructions in this section to disassemble the WI-127.
1. Unplug the WI-127 from the power source.
2. Remove the back of the WI-127 by removing the sixteen acorn nuts
and pulling the back cover from the case. See Figure 4.
Figure 4
Back view of the WI-27
Figure 5
3. If you need to remove the motherboard disconnect all the wires and the
ribbon cable leading to the motherboard and remove the ten hold-down
screws shown in Figure 5.
Hold-down screws on the motherboard.Hold-down screws on the motherboard.
Hold-down screws on the motherboard.
Hold-down screws on the motherboard.Hold-down screws on the motherboard.
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Viewing and Setting Time and Date
Viewing and Setting Time
To exit back to normal weighing mode, press
the SELECT key and save changes as needed
by pressing ENTER with "SAVE?" displayed.
▼
▼▼
If you enter an incorrect digit, press
to clear the display one digit at a time.
▼▼
1. From display mode, press MENU twice…
"HOUR" is displayed.
2. Press ENTER…
The current time is displayed.
In the 12-hour clock configuration, time is displayed as hours,
minutes, and A for A.M. and P for P.M. (e.g. 09 40 A).
In the 24-hour clock configuration, time is displayed as hours,
minutes, and seconds (e.g., 09 40 30).
3. Press UNITS to toggle between the 12-hour and 24-hour clocks.
4. To set the 12-hour clock:
a. Key in the time as
b. Press the +/- key to toggle between A.M. and P.M.
c. After the correct time is entered, press ENTER to accept the
new time.
To set the 24-hour clock:
a. Key in time as hh mm ss.
b. After the correct time is entered, press ENTER to accept
the new time.
hh mmhh mm
hh mm.
hh mmhh mm
Viewing and Setting
If you enter an incorrect digit, press
the Date
▼
▼▼
▼▼
5. Press ENTER to view the new time…
The new time is displayed.
6. Press ESCAPE to return to display mode…
Indicator returns to display mode.
1. From display mode, press MENU three times…
"DAY" is displayed.
2. Press ENTER…
The date is displayed as month-day-year.
3. To change the date, key in the new date using the numeric keypad (the
entire date must be entered), then press ENTER…
The new date is accepted and "DAY" is redisplayed.
4. Press ENTER again to view the new date, or press ESCAPE
to return to display mode…
Indicator returns to display mode.
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to clear the display one digit at a tiime.
7550 In-Motion Software
Factory Default Setting is Yes.
Conveyor
This section of the Installation Manual covers the optional in-motion
software for Model 7550. This software has the following additions
made to the service menus. The complete service menus are included
at the end of this manual. Below are descriptions of each additional
item.
No Choose this if you want the indicator to operate as normal. The inputs
used for in-motion weighing are ignored.
Yes Choose this to use the indicator for in-motion weighing. The indicator
uses the built in reset/set inputs to start and stop averaging weight
readings. An in-motion weighment is the average of all these weight
readings. Every time an in-motion weighment is calculated, the
indicator does the following:
•Updates the gross and net variables with the new weighment.
•Triggers an auto print, if enabled.
•Displays the new weighment for 7 seconds, or until the next
weighment begins (dashes), or an error occurs.
Tare
Default Setup
Modifications
It is always possible to enter tare to any resolution, but this selection
determines how gross, tare, and net are displayed, printed, and calculated.
0.1 d* The net weight is calculated internally to 10 times the resolution,
but displayed and printed to the nearest division. Tare values are
printed and displayed at 0.1 division.
1 d Allows no extra resolution on the tare value. The net weight is
calculated as on a standard indicator.
Scale
Capacity: 150 lb
Division: .1 lb
AZT: 3 divisions
Update: 1 Update/Second
Filter/Threshold: Filter constant = 3
The default filter settings for the in-motion operation is a filter time
constant of 3 and a threshold equal to full scale capacity.
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Getting Weight – There are two (2) ways to get weight from the NCI 7550
In-Motion Conveyor Scale. "Standard" or poll method requires a command
to be sent from a PC to the scale to get weight, or "Burst" method which
requires that the PC is always ready to catch the weight automatically when
a package exists the scale conveyor. In case of error, the scale can be
commanded to return the last harmonized weight, units and status in either
standard or burst mode. Refer to Weigh-Tronix Serial Communications
Protocol Document SCP-16.
Standard / Poll Mode – With "standard" selected in the indicator as the
interface method, the in-motion scale requires a "P" command be sent to
request weight. The scale then returns the next harmonized weight, units
and status. "L" command will return the last harmonized weight, units and
status.
Burst Mode – While in the in-motion mode, autoprint changes functionality
to automatically print each time an in-motion weighment is made through
the in-motion logic. The default group for Autoprint is 1. (Displayed weight).
While in in-motion mode, the autoprint functions in the background.
Active X Control – This is a special purpose serial communications
control. It allows access to weight and status information from an NCI Model
7550 In-Motion Conveyor Scale from within the application. It does this by
handling all of the interface requirements defined in the NCI 7550 serial
communications protocol. Connect the scale to an available serial port on
your computer, set the required properties in the control and immediately
have access to weight, status and other scale functions.
This control provides an event-driven method of handling serial communications from the scale. Each control used corresponds to one serial port and
is used to access data from one scale.
Within the event-driven method, the application will be notifed the moment
an event takes place, such as when a complete weight message has been
received from the scale. In such a case, you can use the On-ScaleComm
event to determine which event occurred and then handled it in your
application program.
Since the WTComIM control uses Microsoft MSComm as a constituent
control, a lot of the details usually necessary to handle scale
communications are hidden and taken care of. This includes such items
as synchronizing received messages, parsing message strings, extracting
and converting weight and status information, handling communication
errors and detecting scale disconnect.
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Dynamic Weighment Serial Output – The gross and net weights in the
layout menus follow the in-motion weighments while in the in-motion mode.
Each time the indicator calculates a new average, the gross and net weights
are calculated based on the new weighment. The gross and net change
from the last in-motion weighment value when the indicator returns to live
weight display. Dashes are printed if "no" is selected for "inhibited" for that
group and dashes are on the display to indicate in-motion sampling.
In these display modes, the only function that is offered from the front panel
is the entrance into the service menus. After entering the service menus,
the indicator stops the in-motion functionality.
Display Modes
Weighing Errors
If the indicator is in a user menu or editing a register, these display modes
do not appear on the display. In this case, the in-motion operations appear
to occur in the background.
- - - - - - - -
- - - - This indicates that the indicator is sampling the current item on the
- - - - - - - -
scale. As soon as the sampling is completed, the weight is calculated and
displayed.
Annunciator 5 (ID) – This annunciator is used to indicate that the display
is showing the current in-motion weighment. This display appears for seven
seconds after each in-motion weighment is calculated. This mode can be
interrupted by a new weighment (dashes).
Sampling occurs from leading edge to trailing edge of the reset/set input.
The leading edge must correspond to the weight being entirely on the live
rail, and the trailing edge must correspond to the weight just ready to begin
leaving the live rail.
1) Six seconds maximum are allowed from arrival to exit. This supports
a 12 inch package at a minimum speed of 30 ft/min on a 4 ft. conveyor
scale. If 6 seconds elapse, an error message is displayed, and autoprint is not initiated. The error message persists until a new weighment
is begun, but no longer than 7 seconds (unless retriggered by a
subsequent weighment.) After 7 seconds, the display reverts to live
weight.
2) At least two samples are required to be accumulated to consider a
weighment to be valid. This corresponds to 1/30th of a second. This
requirement is violated when boxes are too long or a conveyor is moving
too fast. If less than 2 samples are accumulated, the weighment is
considered to be in error and is handled in the same manner as (1)
above.
3) Weighments less than the upper limit of the AZT window are consid-
ered to be in error and are handled in the same manner as (1) above.
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7550 Operation
The in-motion system will only weigh and transmit data properly if there is
only one package on the scale at a time with packages identical in size. This
means front edge to front edge spacing of at least the length of the conveyor.
With varying length package applications, there are two criteria which must
be met:
1) With a package on the conveyor scale, the next one coming on the scale
must not break the entrance photocell beam prior to the one on the scale
breaking the exit beam.
2) With a package on the conveyor scale, the exiting package must clear
the exit beam prior to the package entering the scale clearing the
entrance beam.
If either of these rules are violated, erroneous weights may be transmitted or weight values not transmitted at all.
This simple formula will help you figure the minimum package spacing
needed for unequal package sizes.
Package Spacing
Unequal Package Spacing = Conveyor Length + (Longest Package - Shortest Package)
(Front Edge to Front Edge)
The following diagram shows a formula for figuring throughput of
identically sized packages.
Throughput for Unequal Size PThroughput for Unequal Size P
Throughput for Unequal Size P
Throughput for Unequal Size PThroughput for Unequal Size P
roductsroducts
roducts
roductsroducts
23
Belt Speed x 12Belt Speed x 12
Belt Speed x 12
Belt Speed x 12Belt Speed x 12
Conveyor Length + Length of Longest PackageConveyor Length + Length of Longest Package
Conveyor Length + Length of Longest Package
Conveyor Length + Length of Longest PackageConveyor Length + Length of Longest Package
Length of shortest packageLength of shortest package
Length of shortest package
Length of shortest packageLength of shortest package
Page 27
IN-MOTION
SERVICE MENU
2425262728
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NOTES
Page 33
1000 Armstrong Drive
Fairmont, MN 56031 USA
Telephone: 507-238-4461
Facsimile: 507-238-4195
E-Mail: service@wt-nci.com
www.wt-nci.com
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