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

8
Installation Guide
Fig. 2: Motherboard Layout
Removing and Replacing the Rear Panel
Before you remove the rear panel, remove AC power. Power down the scale if the
optional battery power is present. Removing the rear panel requires a 5/16” nut driver.
To replace the rear panel and achieve a tight seal, each screw requires a rubber
bonded washer and the gasket needs to be in place. Tighten screws to 20 in-lb to
achieve proper sealing. Tighten all watertight glands until the cable exiting the watertight
can no longer slide through the watertight – this is usually finger tight plus a quarter turn
with a wrench for a seal.

9
Load Cell Connection
Load cell connections are made through terminal block TB1. The power cord connects
to terminal block TB5 adjacent to the transformer.
Fig. 3: Load Cell and Power (lower left of board)
4 wire load cell
6 wire load cell
J1 Jumper
In
Out
J2 Jumper
In
Out
Load Cell Input (TB1)
Description
Load Cell Color Code
+ SIG
+ Signal
Red
- SIG
- Signal
White
+ EX
+ Excitation
Green
- EX
- Excitation
Black
+ SEN
+ Sense Signal
Blue
- SEN
- Sense Signal
Brown

10
Power Connection and Fuse
Power input is located at terminal block TB5, next to the fuse and black transformer.
Neutral
Ground
Line (Hot)
N
G
L
Make sure power is off before replacing the fuse. The scale's fuse (F1) is located next
to the power terminal (J1).
The scale has a filtered power supply to reduce the effects of normal line noise, but it
cannot limit severe fluctuations. Be sure the AC power is not excessively noisy. If
problems occur, noise producing devices may have to be suppressed to minimize their
effect.
RS232 and Remote Switch Connection
The Remote Switch and Serial Communications are located in the TB3 terminal block.
Option cables are passed through watertight glands mounted on the rear cover of the
indicator.
Fig. 4: Output Serial and Remote Switch Connection (upper right of board)

11
TB3 RS232 and Remote Switch Connections
Description
RX1
RS232 Port 1 Receive (RXD)
TX1
RS232 Port 1 Transmit (TXD)
GND
Common Ground
SW1
Remote Switch 1 Input
SW2
Remote Switch 2 Input
RX2
RS232 Port 2 Receive (RXD)
TX2
RS232 Port 2 Transmit (TXD)
GND
Remote Switch Common
VDC
4.7Vdc
RS232 Output
DB9 Female Connector Wiring
RS232 Output
DB9 Male Pin Wiring
Female Description
Male Description
2
(TXD) Transmitted Data
(RXD) Received Data
3
(RXD) Received Data
(TXD) Transmitted Data
5
(GND) Ground
(GND) Ground

12
Output Connections
Each output point consists of a current-sinking Darlington pair with a transient –
suppression diode connected to +V. Jumpers JU7 and JU3 control whether +V is
board-supplied 4.7 VDC or 12 VDC. One or the other jumper needs to be installed for
output operation, but never both. The maximum current sinkable through a single
output is 500mA. If using board-suppled voltage, the maximum total current available is
800 mA.

13
Calibration Guide
Note: To calibrate, remove the backplate and use the internal button board, which gives
access to the PRINT, UNITS, OVER, and UNDER buttons.
Entering Calibration and Parameter Setup Mode
The calibration push button is located near the center of the board and labeled CAL.
Press this button to enter calibration and setup.
Exit Calibration and Parameter Setup Mode
The calibration push button is located near the center of the board and labeled CAL.
Press this button to exit calibration and save settings.
Set Scale Capacity
The Capacity selection is displayed after entering the Calibration and Setup mode.
1. 1 CAL is displayed
2. Press ZERO
3. The display will alternate between CAP Aj and the currently selected capacity
4. Press ZERO to change the capacity
5. The units annunciator will flash indicating the unit of measure for the capacity.
Press ZERO to change the unit of measure if required.
6. Press PRINT
7. The right most digit will flash. Press ZERO to change this number from 0 to 9.
8. Press PRINT to move to the next digit to the left.
9. Repeat until all digits have been set to the desired scale capacity.
10. Once the digits have been set, the display will return to alternately displaying CAP
Aj and the new capacity value.
Set Scale Count By
After the capacity has been entered, count by (resolution) will automatically be set for a
legal for trade 5000 division level.
1. After calibration, press UNITS.
2. The display will alternate between Cnt by and the current count by
3. Press ZERO to select the desired count by
4. To exit and save changes, press UNITS until donE n is displayed.
5. Press ZERO
6. donE y will be displayed
7. Press UNITS to return to the run mode

14
Calibration
After count by has been set, calibration is required
1. Press UNITS until CAL 0 appears on the display
2. Remove all weight from the scale platform
3. Press ZERO and wait for the display to count down to 0
4. The display will alternate between CAL FS and the scale capacity
5. Place the calibration weight on the scale platform (2% of capacity to full capacity)
6. If calibrating at scale capacity, press ZERO to begin calibration and move to step
12. If not calibrating at the scale capacity, continue to step 7.
7. Press PRINT
8. The right most digit will flash. Press ZERO to change this number from 0 to 9.
9. Press PRINT to move to the next digit to the left
10. Repeat until all digits have been set to the desired calibration weight
11. Press PRINT and the calibration process will begin and the display will count
down to zero.
12. The display will momentarily display done, followed by saved and return to the
normal weighing mode
13. Verify scale calibration
NOTE: Calibration at 2% of capacity has been provided as a convenience to customers
with scales in inaccessible locations. Scales calibrated at 2% will not be as accurate at
full capacity compared to scales calibrated at full capacity. It is the responsibility of the
installer to ensure that scale accuracy is achieved after any calibration.
Calibration Error Codes
Code
Solution
rg Err
The calibration zero is out of range. Press ZERO to clear error. Refer to
the Scale Calibration Error Troubleshooting section.
Er nEg
The calibration span is in a negative range. Check polarity of load cell
connection and repeat calibration.
SPAn E
The calibration span is out of range. Press ZERO to clear this error.
Refer to the Scale Calibration Error Troubleshooting section.
er nna
The scale is sensing an unstable weight. Remove any vibration or air
currents to continue calibration.

15
Scale Calibration Error Troubleshooting
The allowable load cell signal input range is 0.30 mV/V to 5.0 mV/V.
1. Calculate scale divisions by dividing the scale capacity by the count by.
Example: For a 50 x 0.01 lb scale, divide 50 by 0.01 for a result of 5000d
2. Enter the calibration and parameter setup mode.
3. Press PRINT until the configuration menu 2 Cnfg is displayed.
4. Press ZERO to enter the configuration menu.
5. Press UNITS until the scale counts are displayed.
6. Remove all items from the platform and record the zero load scale counts
reading.
7. Place full capacity on the platform and record the scale counts.
8. Subtract the zero load counts from the full load counts to calculate the span.
9. The span number, from step #7, must be higher than the scale divisions found in
step #1.
The maximum span, at full load is 750,000. If the span is higher, the span calibration
will not be accepted.
If the span counts are too low or too high, check the load cell connections. If the
connections are correct, replace the load cell.

16
Scale Parameter Setup
Note: To enter parameter setup, remove the backplate and use the internal button
board, which gives access to the PRINT, UNITS, OVER, and UNDER buttons.
Entering Calibration and Parameter Setup Mode
The calibration push button is located near the center of the board and labeled CAL.
Press this button to enter calibration and setup.
Exit Calibration and Parameter Setup Mode
The calibration push button is located near the center of the board and labeled CAL.
Press this button to exit calibration and save settings.
Navigating Parameter Menu
Press UNITS and PRINT to navigate to the desired top level parameter group. Enter
the group by pressing ZERO. Once within a group, press UNITS to advance, PRINT to
back up and ZERO to change the currently displayed parameter setting.
Parameter Groups
The scale parameters are divided up into eight parameter groups. Each group contains
related parameters. Below is a brief list describing each parameter group.
1 CAL Capacity and Calibration
2 CnFg General Settings
3 SEr1 Serial port #1
4 SEr2 Serial port #2
9 OPEr Checkweigh Operation
99 don Exit Setup

17
Legal for Trade Restrictions
When the Legal for Trade mode is enabled, it automatically disables some menus and
parameter options. This is done to comply with NTEP and CWM requirements. The
menus and parameter sections are shown on the following pages. Menus and
parameters not available when in the Legal for Trade mode are marked by an asterisk.
Audit Counters
When entering calibration mode, the Parameter audit counter and the Calibration audit
counter will momentarily be displayed. The Parameter audit counter increments when
legal for trade values are changed. The Calibration audit counter increments when the
scale is calibrated.
Software Part Number and Revision Level
During the front panel access procedure, the scale will display the software number and
revision. The software number is Su 191 followed by the software revision level rEv
0.0 or higher.
Please have the software number 191 and the revision level available when contacting
our technical support department.