Salter Brecknell 7620U User Manual
Model 7620U
Bench Scale
User’s Manual
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
specifications at any time.
10/23/03 7620U_U.P65 PN 7424-16232E e1 Printed in USA
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Model 7620U Bench Scale User’s Manual
Table of Contents
Specifications ..................................................... 4
Initial Setup ......................................................... 7
Operation ............................................................ 8
7620U Menu Structure...................................... 11
Diagnostics Mode ............................................. 12
Configuration Mode .......................................... 15
Calibration Mode .............................................. 17
Gravity Mode .................................................... 19
Review Scale Settings ...................................... 20
Communications ............................................... 21
Error Codes ...................................................... 23
Troubleshooting ................................................ 24
Spare Parts Listing ........................................... 27
Model 7620U Bench Scale User’s Manual
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Specifications
Capacity/Resolution
Agency Certificates
of Conformance
7620-30 (6-30)
0-6 kg x 0.001 kg n1 =6000 d
6-30 kg x 0.005 kg n2 =6000 d
7620-30 (5-30)
0-5 kg x 0.001 kg n1 = 5000 d
5-30 kg x 0.005 kg n2 = 6000 d
7620-35(6-35)
0-6 kg x 0.001 kg n1 =6000 d
6-35 kg x 0.01 kg n2 =3500 d
7620-50
0-5 kg x 0.005 kg n1 =1000 d
5-50 kg x 0.01 kg n2 =5000 d
The Model 7620 is approved as legal for trade:
United States - NTEP COC #95-071
Canada - Ministry of Industry #AM 5074
Europe – EEC (OIML) #UK 2476
Dimensions
Power Supply
Frequency
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Model 7620U Bench Scale User’s Manual
For use as a Class III device from +5ºC to 40ºC
356 mm L x 318 mm W x 104 mm H
14" L x 12.5" W x 4.2" H
UL/CSA and CE approved inline power supply
with universal adapter pigtail.
Input: 230 VAC + 10% -15%
Output: 15 VDC @ .3 Amps
50 (±3) Hz Standard
Power Requirements
0.1 amp maximum
Operating Temperature
Construction
Overload Protection
Display
Scale Leveling
Zero Window
Under Capacity Limits
+5º C to + 40º C
10% to 95% RH (non-condensing)
Die cast aluminum base and load bridge.
Plastic ABS weigh platter
Aluminum quartz digital load cell
Adjustable center stop
Fixed corner stops
400% static loading
200% dynamic loading
13mm (0.5") high seven-digit LCD
Key panel with ZERO and F1 function keys
Optional remote display with 2m (7ft) cable
Level bubble under weigh platter
Adjustable feet in each corner
Automatic zero setting is ±10% of maximum
capacity—active at power up. Manual zero
setting range is ± 2% of maximum capacity—
active using the ZERO key.
Under capacity indication will be given with
dashes appearing on the bottom line of the
display whenever the display is more than 2
percent below the initial zero value.
Over Capacity Limits
Sealing
Model 7620U Bench Scale User’s Manual
Over capacity indication will be given with dashes
appearing in the upper line of the display whenever the weighed item exceeds 9 divisions over
the rated capacity of the unit. The scale will use
the initial zero value for reference for over
capacity determination.
Access to the calibration switch can be secured
with a lead wire or pressure sensitive security
seal. The remote and primary indicators have no
metrological features that require the use of a
security seal.
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Internal Resolution
1 part in 2,000,000
Dynamic Response
Communications
The time interval of weight applied to scale until
stable weight is displayed.
0 - 1000d, 350 msec
1000d+, 500 msec
Maximum mean average
Factory default settings: 9600 baud, 7 data bits,
even parity, 1 stop bit.
Standard 9-pin pass through RS-232 interface
cable included. Not a null modem.
RS-232 bidirectional configurable 1200 to 19.2 K
baud. Transmits weight and scale status whenever ASCII “W” <CR> is sent by a remote device.
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Model 7620U Bench Scale User’s Manual
Initial Setup
Unpacking the Scale
Installing the Scale
1. Check container for any obvious evidence of
damage.
2. Remove contents of the shipping container.
3. Inspect the scale for shipping damage.
Immediately report any damage to the
shipper.
1. Mount the scale on a stable, level surface
free from air currents and vibration. Be sure
the scale platter does not touch any adjacent
surfaces.
2. If you want to install the scale surface flush
with a countertop, use these dimensions to
guide construction:
7620U Platform Minimum Cutout
Dimensions Dimensions
356 mm Wide 375 mm Wide
318 mm Deep 337 mm Deep
104 mm Minimum Height
3. Loosen the plastic collars on the leveling
feet. Level the scale by using the level bubble
under the scale platter as a guide. Be sure all
four feet are in firm contact with the counter,
then tighten all collars.
4. Make sure all power cords, remote display
cables, etc. are not touching the live weighing
surface.
5. Plug the unit into an appropriate voltage
outlet, properly grounded.
Model 7620U Bench Scale User’s Manual
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Operation
Power Up
Test Sequence
If RAM or ROM error is
reported, you must
press the F1 key to
acknowledge the
condition.
Performing a Normal
Weighment
If the scale is outside
the ±10% zero
window, center dashes
are displayed.“
Reapply power to
reset the initial zero
setting.
_ _ _ _
When the unit is first powered on it will perform a
test sequence. During this sequence the display
will show the following:
• The model number and software revision
level
• A numeric counting test to all segments of
the display
• A test of Random Access Memory (RAM)
• A test of Read Only Memory (ROM)
If everything is OK, the display will show zero
weight and the scale is ready for use.
1. With the scale powered on, make sure the
scale platter is empty and the display is at
zero. If it is not, press the ZERO key…
“0.000” is displayed.
”
2. Place an item to be weighed on the scale
platter…
The scale will display the gross weight.
3. Remove the item from the scale platter.
Model 7620 U
Resident Display
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Model 7620U Bench Scale User’s Manual
Operational Controls
Remote Display
ZERO Key – The ZERO key will zero the scale
if weight is stable, functions as the NO or
SCROLL key in the Menu mode, and as the
INCREASE key in the Gravity mode.
F1 Key – The F1 key can be used to recall the
scale configuration information during the
initial power-up test sequence. This key also
functions as YES or ACCEPT in the Menu
mode, and as the DECREASE key in the
Gravity mode.
All NCI 7620 bench scales can have an
optional remote display (shown above with no
keyboard function). If a remote display with
keyboard is used, then Switch 3 (shown in
Figure 1) determines which display keyboard
is functional.
Accessing the
Menu Mode
Accessing the
Gravity Setting Mode
Model 7620U Bench Scale User’s Manual
Switch 3 Settings
Closed= internal display keys operational
Open = external display keys operational
The 7620 family powers up in normal weighing
mode ready for weighing operations. You can
access the Menu mode by setting Switch 1
shown in Figure 1 to the OPEN or Menu mode
position.
Access the GRAVITY setting mode by setting
Switch 2 shown in Figure 1 to the OPEN or
GRAVITY mode position.
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Figure 1
7620 U Switch Location
Menu Mode
Gravity Mode
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There are three modes available to you with
Switch 1 in the MENU Mode or OPEN position.
They are as follows:
1. DIAG Mode – To test areas of the scale’s
function
2. CONFIG Mode – To configure your scale for
your application
3. CAL Mode – To calibrate the scale
With Switch 2 in the GRAVITY Mode or OPEN
position, you may increase the “Local” gravity
value by pressing the ZERO key or decrease the
value by pressing the F1 key.
The structure for these menus is shown in
Figure 2. Specific information about each mode
and step-by-step instructions for accessing them
follow.
Model 7620U Bench Scale User’s Manual
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