Doran 7400 User manual

7400 Series
Checkweigh Indicator
Technical Manual
MAN0198 – Rev 4.8 Doran Scales, Inc. www.doranscales.com

Table of Contents
Introduction ........................................................................................................................... 1
Unpacking Your Scale ....................................................................................................................... 1
7400 Indicator Specifications ........................................................................................................... 2
Scale Annunciators .......................................................................................................................... 3
Power Up ......................................................................................................................................... 4
Basic Weighing Operation ................................................................................................................ 4
ZERO ................................................................................................................................................ 4
UNITS (Internal) ............................................................................................................................... 4
PRINT (Internal) ............................................................................................................................... 4
OVER (Internal) ................................................................................................................................ 4
UNDER (Internal) ............................................................................................................................. 4
Three Band Checkweighing ..................................................................................................... 5
Three Band Checkweighing (
9.1 C.o.
set to operation starting with
3
) ............................................ 5
Enter and Display of Checkweigh Limits (
9.2 C.E.
default value
SCr
) .............................................. 5
Weight Reference and Digital Entry of Checkweigh Limits (
9.2 C.E.
set to
SCS
) .............................. 5
Weight Reference Entry of Checkweigh Limits (
9.2 C.E.
set to
Pb
) .................................................. 5
Five Band Checkweighing ........................................................................................................ 6
Five Band Checkweighing (
9.1 C.o.
set to operation starting with
S
) .............................................. 6
Enter and Display of High and Low Limits (
9.2 C.E.
default value
SCr
) ............................................ 6
Weight Reference and Digital Entry of High and Low Limits (
9.2 C.E.
set to
SCS
) ............................ 6
Weight Reference Entry of High and Low Limits (
9.2 C.E.
set to
Pb
) ................................................ 7
Zero Band Checkweighing ....................................................................................................... 7
Zero Band Checkweighing (
9.1 C.o.
set to operation starting with
0
) .............................................. 7
Installation Guide ................................................................................................................... 8
Removing and Replacing the Rear Panel .......................................................................................... 8
Load Cell Connection ....................................................................................................................... 9
Power Connection and Fuse ........................................................................................................... 10
RS232 and Remote Switch Connection ........................................................................................... 10
Output Connections ....................................................................................................................... 12
Calibration Guide .................................................................................................................. 13
Entering Calibration and Parameter Setup Mode ........................................................................... 13
Exit Calibration and Parameter Setup Mode .................................................................................. 13
Set Scale Capacity .......................................................................................................................... 13
Set Scale Count By ......................................................................................................................... 13
Calibration ..................................................................................................................................... 14
Scale Calibration Error Troubleshooting ......................................................................................... 15
Scale Parameter Setup .......................................................................................................... 16
Entering Calibration and Parameter Setup Mode ........................................................................... 16
Exit Calibration and Parameter Setup Mode .................................................................................. 16
Navigating Parameter Menu .......................................................................................................... 16
Parameter Groups ......................................................................................................................... 16
Legal for Trade Restrictions ............................................................................................................ 17
Audit Counters ............................................................................................................................... 17
Software Part Number and Revision Level ..................................................................................... 17
Capacity and Calibration -
1 CAL
.................................................................................................... 18
General Settings -
2 Cnfg
............................................................................................................... 21

Serial (RS232) Port 1 -
3 SEr1
........................................................................................................ 24
Serial (RS232) Port 2 -
4 SEr2
........................................................................................................ 25
Checkweigh and Output Operation –
9 OPEr
................................................................................. 27
Exit -
99 don
.................................................................................................................................. 28
Data Communications .......................................................................................................... 29
Data String Formatting ................................................................................................................... 30
Custom Data String Configuration .................................................................................................. 34
Indicator Commands ...................................................................................................................... 36
Troubleshooting ................................................................................................................... 38
Scale Messages .............................................................................................................................. 39
Error Messages .............................................................................................................................. 39
Default to Factory Settings ............................................................................................................. 41
Scale Default Settings .................................................................................................................... 41

1
Introduction
Thank you for purchasing a Doran Scales product. Please read this manual to ensure
obtaining all the benefits that the indicator can provide. This manual is intended for
revision 4.8 and greater scales. If required, Doran can upgrade the software in your
scale to the current revision. Please contact the Doran Scales Technical Support
Department at [email protected] for upgrade details.
Unpacking Your Scale
Before unpacking your Doran scale, please read the instructions in this section. Your
new scale is a durable industrial product, but it is also a sensitive weighing instrument.
Normal care should be taken when handling and using this product. Improper handling
or abuse can damage the scale and result in costly repairs that will not be covered by
the warranty. If you notice any shipping damage, notify the shipper immediately. Please
observe the following precautions to insure years of trouble-free service from your new
scale.
• DO NOT drop the scale.
• DO NOT immerse the scale.
• DO NOT drop objects on the platform.
• DO NOT pick up the scale by the top of the weighing platform.
• Carefully remove the scale from the shipping carton.

2
7400 Indicator Specifications
NTEP Certificate
Class III – 10,000d; Cert. #99-129A4
Enclosure
304 Stainless Steel
Product Dimensions
10” W x 6.75” H x 3.5” D
Environmental Protection
IP69K
Legal for Trade
Temperature Range
14 F to 104F (-10 C to +40 C)
Resolution Range
200d to 50,000d
Analog Signal Sensitivity
0.16 µV/e minimum, 0.5 µV/e typical
System Linearity
0.01% full scale
Analog Signal Range
-0.5mV/V to 5 mV/V with 4 and 6 wire input
Excitation Voltage
5 VDC
Number of Load Cells
Up to 8 350 Ohm
Scale Inputs
One
Calibration Range
Calibrate between 100% and 2% of capacity
Power Input
100 – 240VAC 50/60Hz
Display
0.8" high, 6 digit LED
Displayed Units
lb, kg, oz, g, lb:oz
Capacity Range
1 to 999,000 lb
Serial Interface
Two Bi-directional RS-232 ports standard
Controls
ZERO
Internal UNITS, PRINT, OVER, UNDER
Digital IO
Two remote switch inputs
Eight outputs – 4.7 or 12 VDC configurable up to 800mA.
Current-sinking Darlington pair

3
Fig. 1: Model 7400 Front Panel Layout
The operational controls for the Model 7400 by default is the ZERO button. An internal
board comes installed to access the UNITS, PRINT, OVER, and UNDER buttons
Scale Annunciators
ZERO
Center of zero. The annunciator will illuminate while the scale is
displaying a zero weight.
MOT
Motion indicator. This symbol represents motion or instability of the
weight. The annunciator will illuminate when motion is sensed on the
platform. Changes in weight, vibration or air currents can cause the
scale to go into motion.
UNDER
Under illuminates to indicate weight is below the Under target and
above the Low target or flashes if below the Low target.
ACCEPT
Accept illuminates to indicate weight is at or above the Under target
and at or below the Over target.
OVER
Over illuminates to indicate weight is above the Over target and below
the High target or flashes if above the High target.

4
Power Up
Connect the cord to a compatible power source.
For indicators with battery option, press and hold ZERO.
Basic Weighing Operation
1) Remove all items from the scale platform
2) Press the ZERO button to zero the scale
3) The weight display now reads zero
4) Place an item on the scale platform and wait for the motion annunciator to turn
off, indicating an accurate, stable weight
ZERO
ZERO is used to zero the scale. To zero the scale, wait until the scale is stable and
press the ZERO button. The scale will not zero if the scale is in motion. The zero
function will operate over the entire capacity of the scale.
The scale is equipped with a Zero on Demand parameter which zeros the scale upon
the next stable reading after ZERO is pressed.
UNITS (Internal)
UNITS selects the current unit of measure. Press UNITS to change the current unit.
The units annunciator to the right of the display will indicate the current unit or measure:
lb, oz, kg, g or lb:oz.
Each unit can be enabled or disabled in the scale parameter setup. Lb:oz is disabled by
default. Lb:oz not available for tolerance values. Lb:oz not available for tolerance
values or checkweigh limits and cannot be transmitted as data.
PRINT (Internal)
PRINT transmits data to a printer or other external devices. When the data is
transmitted, the leftmost display digit will momentarily display an "r" to confirm data
transmission.
There are many parameters that customize the control of manual and automatic
transmission of data. Data can be transmitted via standard RS232. See parameters
settings for how to configure communication ports.
OVER (Internal)
OVER allows entry of the upper checkweighing limits. It is also used to increment a
checkweighing value that is being modified.
UNDER (Internal)
UNDER allows entry of the lower checkweighing limits. It is also used to decrement a
checkweighing value that is being modified.

5
Three Band Checkweighing
Three band checkweighing classifies weighments into over, accept and under. The
default configuration is three band checkweighing. Note that lb:oz is not supported for
checkweighing limits.
Three Band Checkweighing (
9.1 C.o.
set to operation starting with
3
)
1. Remove all items from the scale platform
2. Press ZERO and the display will read zero weight
3. Place an item on the scale platform and wait for the scale to stabilize
4. Accept, Over or Under annunciators indicate checkweigh status
Enter and Display of Checkweigh Limits (
9.2 C.E.
default value
SCr
)
1. Press OVER or UNDER
2. The display will briefly read over or under followed by the current limit
3. Press either OVER to increase the weight value or press UNDER to decrease the
weight value. Pressing and holding will accelerate the weight scroll.
4. Press ZERO to save the value or press PRINT to exit without saving
5. saVed is displayed if saved or abort is shown if aborted
NOTE: To digitally adjust the platform weight for OVER and UNDER limits, the
parameter C.E. must be set to SCS.
Weight Reference and Digital Entry of Checkweigh Limits (
9.2 C.E.
set to
SCS
)
1. Press ZERO
2. Place a target item on the scale
3. Press OVER or UNDER
4. The display will briefly read over or under followed by the weight on the platform
5. Press either OVER to increase the weight value or press UNDER to decrease the
weight value. Pressing and holding will accelerate the weight scroll.
6. Press ZERO to save the value or press PRINT to exit without saving
7. saVed is displayed if saved or abort is shown if aborted
NOTE: To digitally adjust the platform weight for OVER and UNDER limits, the
parameter C.E. must be set to SCS.
Weight Reference Entry of Checkweigh Limits (
9.2 C.E.
set to
Pb
)
1. Press ZERO
2. Place a weight equal to the desired OVER or UNDER limit on the platform
3. Press OVER or UNDER
4. over or under is displayed and then saVed to indicate the new OVER limit was
saved.
NOTE: To enable Push-button entry of OVER and UNDER limits, the C.E. parameter
must be set to pb.

6
Five Band Checkweighing
Five band checkweighing classifies weighments into high, over, accept, under and low.
Note that lb:oz is not supported for checkweighing limits.
Five Band Checkweighing (
9.1 C.o.
set to operation starting with
S
)
1. Press ZERO
2. Place an item on the scale
3. Checkweigh status is indicated as follows
a. Flashing OVER = HIGH
b. Solid OVER = OVER
c. Solid ACCEPT = ACCEPT
d. Solid UNDER = UNDER
e. Flashing UNDER = LOW
Enter and Display of High and Low Limits (
9.2 C.E.
default value
SCr
)
1. Press and hold the OVER or UNDER until the display reads High or louu
respectively
2. The current weight value of the saved limit is displayed and checkweigh status
annunciators will flash
3. Press either OVER to increase the weight value or press UNDER to decrease the
weight value. Pressing and holding will accelerate the weight scroll.
4. Press ZERO to save the value or press PRINT to exit without saving
5. saVed is displayed if saved or abort is shown if aborted
NOTE: To digitally adjust the platform weight for OVER and UNDER limits, the
parameter C.E. must be set to SCr.
Weight Reference and Digital Entry of High and Low Limits (
9.2 C.E.
set to
SCS
)
1. Press ZERO
2. Place an item of the desired weight on the scale platform
3. Press and hold the OVER or UNDER until the display reads High or louu
respectively
4. The current weight value of the saved limit is displayed and checkweigh status
annunciators will flash
5. Press either OVER to increase the weight value or press UNDER to decrease the
weight value. Pressing and holding will accelerate the weight scroll.
6. Press ZERO to save the value or press PRINT to exit without saving
7. saVed is displayed if saved or abort is shown if aborted
NOTE: To digitally adjust the platform weight for OVER and UNDER limits, the
parameter C.E. must be set to SCS.

7
Weight Reference Entry of High and Low Limits (
9.2 C.E.
set to
Pb
)
1. Press ZERO
2. Place an item of the desired weight on the scale platform
3. Press and hold the OVER or UNDER until the display reads High or louu
respectively
4. The display will briefly read over or under followed by the weight on the platform
and checkweigh status annunciators will flash
5. Press either OVER to increase the weight value or press UNDER to decrease the
weight value. Pressing and holding will accelerate the weight scroll.
6. Press ZERO to save the value or press PRINT to exit without saving
7. saVed is displayed if saved or abort is shown if aborted
NOTE: To enable Push-button entry of OVER and UNDER limits, the C.E. parameter
must be set to pb.
Zero Band Checkweighing
Basic checkweighing - simply set the desired weight on the platform, press zero and
checkweigh based upon the standard tolerances in the O.U. parameter (
9.3 O.U.
).
Zero Band Checkweighing (
9.1 C.o.
set to operation starting with
0
)
1. Remove all items from the scale platform
2. Place the target weight on the scale platform
3. Press ZERO and the display will read zero weight
4. Remove the target weight
5. Place an item on the scale platform and wait for the scale to stabilize
6. A zero weight will indicate the item is exactly the target weight. Any weight above
or below zero indicates the amount of weight away from the target weight.
7. Accept, Over or Under will be displayed