KERN & Sohn GmbH
Ziegelei 1
D-72336 Balingen
email: info@kern-sohn.com
Phone: +49-[0]7433- 9933-0
Fax: +49-[0]7433-9933-149
Internet: www.kern-sohn.com
Operating Instructions
Pallet scales
KERN UFB/UFN
Version 1.1
02/2010
GB
UFB/UFN-BA-e-1011
GB
KERN UFB/UFN
Version 1.1 02/2010
Operating Instructions
Pallet scales
Table of Contents
1 Technical Data ................................................................................................... 4
2 Appliance overview display device.................................................................. 6
2.1 Keyboard overview .......................................................................................................7
2.1.1 Numeric input via navigation keys ..................................................................................... 8
2.2 Overview of displays.....................................................................................................8
3 Basic Information (General) ............................................................................. 9
3.1 Proper use ....................................................................................................................9
3.2 Improper Use................................................................................................................9
3.3 Warranty .......................................................................................................................9
3.4 Monitoring of Test Resources.......................................................................................9
4 Basic Safety Precautions................................................................................ 10
4.1 Pay attention to the instructions in the Operation Manual ..........................................10
4.2 Personnel training.......................................................................................................10
5 Transportation & Storage ............................................................................... 10
5.1 Testing upon acceptance ...........................................................................................10
5.2 Packaging / return transport .......................................................................................10
6 Unpacking and implantation .......................................................................... 10
6.1 Installation Site, Location of Use ................................................................................10
6.2 Unpacking...................................................................................................................11
6.3 Scope of delivery / serial accessories: .......................................................................11
6.4 Placing........................................................................................................................11
6.5 Mains connection........................................................................................................12
6.6 Storage battery operation (optional) ...........................................................................12
6.7 Adjustment..................................................................................................................13
6.8 Verification..................................................................................................................15
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7 Operation ......................................................................................................... 17
7.1 Start-up.......................................................................................................................17
7.2 Switching Off ..............................................................................................................17
7.3 Zeroing .......................................................................................................................17
7.4 Simple weighing .........................................................................................................17
7.5 Weighing with tare ......................................................................................................18
7.6 Weighing with tolerance range ...................................................................................18
7.7 Manual totalizing.........................................................................................................21
7.8 Automatic adding-up...................................................................................................23
7.9 Animal weighing .........................................................................................................24
7.10 Lock keyboard ............................................................................................................24
7.11 Display background illumination .................................................................................24
7.12 Automatic switch-off function “AUTO OFF“ ...................................................................25
8 Menu................................................................................................................. 26
9 Service, maintenance, disposal ..................................................................... 28
9.1 Cleaning .....................................................................................................................28
9.2 Service, maintenance .................................................................................................28
9.3 Disposal......................................................................................................................28
9.4 Error messages ..........................................................................................................28
10 Data output RS 232C ................................................................................... 29
10.1 Technical Data............................................................................................................29
10.2 Printer mode ...............................................................................................................30
10.3 Continuous data output ..............................................................................................30
11 Instant help................................................................................................... 31
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1 Technical Data
KERN UFB 600K200M UFB 1.5T0.5M
Readability (d) 200 g 500 g
Weighing range (max) 600 kg 1500 kg
Minimum load (Min) 4 kg 10 kg
Verification value (e) 200 g 500 g
Verification class III III
Reproducibility 200 g 500 g
Linearity ± 200 g ± 500 g
Recommended
adjustment weight, not
added (class)
600 kg
(M2)
1.5 t
(M2)
Warm-up time 10 minutes.
Stabilization time (typical) 2-3 sec.
Weighing unit kg
Auto Off Available options 5, 15 min.
Ambient temperature -10°C – 40°C
Moist environment 0 %- 80 % (non-condensing)
Input voltage 220 V – 240 V, 50 Hz
Electric Supply
Power pack secondary voltage 9V, 800mA
Dimensions display unit
(B x D x H) mm
250 x 160 x 58
Dimensions platform
(B x T x H) mm
1100 x 1460 x 90
Weighing surface mm 1100 x 1300
Interface (Standard) RS 232
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KERN UFN 600K200IPM UFN 1.5T0.5IPM
Readability (d) 200 g 500 g
Weighing range (max) 600 kg 1500 kg
Minimum load (Min) 4 kg 10 kg
Verification value (e) 200 g 500 g
Verification class III III
Reproducibility 200 g 500 g
Linearity ± 200 g ± 500 g
Recommended
adjustment weight, not
added (class)
600 kg
(M2)
1.5 t
(M2)
Warm-up time 10 minutes
Stabilization time (typical) 2-3 sec.
Weighing unit kg
Auto Off Available options 5, 15 Min.
Ambient temperature -10°C – 40°C
Moist environment 0 %- 95 % (non-condensing)
Input voltage 220 V – 240 V, 50 Hz
Electric Supply
Power pack secondary voltage 9V, 800mA
Dimensions display unit
(B x D x H) mm
266 x 165 x 96
Dimensions platform
(B x T x H) mm
840 x 1350 x 90
Weighing surface mm 840 x 1190
IP protection IP 67 as per DIN 60529
Interface (Option) RS 232
2 Appliance overview display device
UFB: Plastic version
UFN: Stainless steel version
1. Battery status display
2. Keyboard
3. Weight display
4. Tolerance tag, see chpt 7.6
5. Weighing unit
6. RS-232
7. Input terminal load cell cable
8. Guide rail support base / stand
9. Stop support base / stand
10. Mains adapter connection
11. Adjustment switch
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2.1 Keyboard overview
Button Function
Turn on/off
• Zeroing
Navigation key
• Confirm entry
• Taring
Navigation key
• At numeric input increase flashing digit
• Scroll forward in menu
• Display sum total
Navigation key
• Digit selection to the right
• Add weighing value in summation memory
Navigation key
• Digit selection to the left
• Calculate weighing data via interface
C
• Delete
• Switch-over gross weight net weight
ESC
• Back to menu/weighing mode
Activate animal weighing function
• Activate weighing with tolerance limits
• Delete total added memory
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2.1.1 Numeric input via navigation keys
Press ; current setting appears. The first digit is flashing and can be
changed.
If the first digit is not to be changed, press and the second digit will start
flashing. Each time you press , the display unit jumps to the subsequent
digit, returning to the first digit after the last digit has been pressed.
To change the selected (flashing) digit, press
repeatedly until the desired
value appears. Then select by using additional digits and change these by
using
Finish entry with
2.2 Overview of displays
Display Significance
Rechargeable battery very low
STABLE Stability display
ZERO Zero display
GROSS Gross weight
NET Net weight
AUTO Automatic add-up enabled
Kg Weighing unit
M+ Adding
LED
+ / / -
Indicators for weighing with tolerance limits
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3 Basic Information (General)
3.1 Proper use
The display unit acquired by you is used in combination with a weighing plate and
serves to determine the weighing value of material to be weighed. It is intended to
be used as a “non-automatic weighing system”, i.e. the material to be weighed is
manually and carefully placed in the centre of the weighing plate. As soon as a stable
weighing value is reached the weighing value can be read.
3.2 Improper Use
Do not use display unit for dynamic weighings. In the event that small quantities are
removed or added to the material to be weighed, incorrect weighing results can be
displayed due to the “stability compensation“ in the display unit. (Example: Slowly
draining fluids from a container on the balance.) Do not leave permanent load on the
weighing plate. This may damage the measuring system.
Impacts and overloading exceeding the stated maximum load (max) of the weighing
plate, minus a possibly existing tare load, must be strictly avoided. Both, the weighing
plate and the display unit may be damaged during this process.
Never operate display unit in explosive environment. The serial version is not
explosion protected.
Changes to the display unit's design are not permitted. This may lead to incorrect
weighing results, safety-related faults and destruction of the display unit.
The display unit may only be operated in accordance with the described default
settings. Other areas of use must be released by KERN in writing.
3.3 Warranty
Warranty claims shall be voided in case
• Our conditions in the operation manual are ignored
• The appliance is used outside the described uses
• The appliance is modified or opened
• Mechanical damage or damage by media, liquids, natural wear and tear
• The appliance is improperly set up or incorrectly electrically connected
• The measuring system is overloaded
3.4 Monitoring of Test Resources
In the framework of quality assurance the measuring-related properties of the display
unit and, if applicable, the testing weight, must be checked regularly. The responsible
user must define a suitable interval as well as type and scope of this test. Information
is available on KERN’s home page (www.kern-sohn.com with regard to the
monitoring of display units’ test substances and the test weights required for this. In
KERN’s accredited DKD calibration laboratory test weights and display units may be
calibrated (return to the national standard) fast and at moderate cost.
4 Basic Safety Precautions
4.1 Pay attention to the instructions in the Operation Manual
Carefully read this operation manual before setup and commissioning, even if you
are already familiar with KERN balances.
4.2 Personnel training
The appliance may only be operated and maintained by trained personnel.
5 Transportation & Storage
5.1 Testing upon acceptance
When receiving the appliance, please check packaging immediately, and the
appliance itself when unpacking for possible visible damage.
5.2 Packaging / return transport
Keep all parts of the original packaging for a possibly
required return.
Only use original packaging for returning.
Prior to dispatch disconnect all cables and remove
loose/mobile parts.
Reattach possibly supplied transport securing devices.
Secure all parts such as glass wind screen, weighing
platform, power unit etc. against shifting and damage.
6 Unpacking and implantation
6.1 Installation Site, Location of Use
The display units are designed in a way that reliable weighing results are achieved in
common conditions of use.
Precise and fast work is achieved by selecting the right place for your display unit
and your weighing plate.
On the installation site observe the following:
• Place the display unit and the weighing plate on a stable, even surface.
• Avoid extreme heat as well as temperature fluctuation caused by installing
next to a radiator or in the direct sunlight;
• Protect the display unit and the weighing plate against direct draft from open
windows or doors.
• Avoid jarring during weighing;
• Protect the display unit and the weighing plate against high humidity, vapours
and dust.
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• Do not expose the display unit to extreme dampness for longer periods of
time. Non-permitted condensation (condensation of air humidity on the
appliance) may occur if a cold appliance is taken to a considerably warmer
environment. In this case, acclimatize the disconnected appliance for ca. 2
hours at room temperature.
• Avoid static charge of goods to be weighed or weighing container.
Major display deviations (incorrect weighing results) may be experienced should
electromagnetic fields (e.g. due to mobile phones or radio equipment), static
electricity accumulations or instable power supply occur. Change location or remove
source of interference.
IP 67 protection type as per DIN EN 60529 (KERN UFN only)
Suitable for short-term use in wet areas.
6.2 Unpacking
Carefully remove the display unit from packaging, remove plastic cover and
place it in the designated work area.
6.3 Scope of delivery / serial accessories:
• Scale
• Mains power supply
• Operating instructions
6.4 Placing
Mount the display unit in a way that facilitates operation and where it is easy to see.
Accurate weighing results require a weighing bridge with perfect horizontal alignment.
During initial installation and after each change of work area it is necessary to level
the weighing bridge.
Use with stand (optional)
An optional stand (KERN BFS-07) is available for raising the display unit.
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6.5 Mains connection
Power is supplied via the external mains adapter. The stated voltage value must be
the same as the local voltage. Only use original KERN mains adapters. Using other
makes requires consent by KERN.
6.6 Storage battery operation (optional)
Before the first use, the battery should be charged by connecting it to the mains
power supply for at least 12 hours.
The symbol appearing on the weight display indicates that the battery is
getting low. Approximately 10 h of instrument usage are left; afterwards it will shut off
automatically. Use the supplied battery charger for charging the battery.
Charge status of rechargeable battery is indicated by the LED display.
red:
Voltage has dropped below prescribed minimum.
green:
Rechargeable battery is completely charged
yellow:
Charging storage battery
To save battery life, you can enable the automatic switch-off function "AUTO OFF",
see chpt 7.12.
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6.7 Adjustment
As the acceleration value due to gravity is not the same at every location on earth,
each display unit with connected weighing plate must be coordinated - in compliance
with the underlying physical weighing principle - to the existing acceleration due to
gravity at its place of location (only if the weighing system has not already been
adjusted to the location in the factory). This adjustment process must be carried out
for the first commissioning, after each change of location as well as in case of
fluctuating environment temperature. To receive accurate measuring values it is also
recommended to adjust the display unit periodically in weighing operation.
• Access to menu block “P2 CAL” is locked in verified weighing systems.
KERN UFB
Access to menu requires breaking of seal and activation of adjustment
switch (See chpt 6.8).
KERN UFN
In order to access the menu you will have to short-circuit the two
contacts of the circuit board with a jumper (See chpt 6.8).
Attention:
The instrument will have to be reverified by a bureau of standards and a
new seal attached if a seal was broken before applications subject to
verification can be recommenced.
Please follow verification instructions (See chpt 6.8.).
• The applied adjustment weight depends on the weighing system's
capacity. Carry out adjustment as near as possible to the maximum
weight of the weighing system. Info about test weights can be found on
the Internet at: http://www.kern-sohn.com
• Observe stable environmental conditions. Warm-up time required for
stabilization.
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Switch on instrument and press during self-test.
Press , , in turn and the first menu block “PO
CHK“ will appear.
Press repeatedly until “P2 CAL“ appears.
Press and the first menu item “COUNT“ will appear.
At verified scales (KERN UFB), press first the
adjustment switch.
Press repeatedly until “CAL“ appears.
Press .
Wait for stability display, then press . Ensure that there
are no objects on the weighing plate.
The currently set adjustment weight will be displayed.
Change by pressing the navigation keys (See chpt 2.1.1);
select desired setting; currently enabled digit will be flashing.
Acknowledge by .
Carefully place adjusting weight in the centre of the weighing
plate. Wait for stability display, then press .
After successful adjustment the appliance automatically
returns to weighing mode.
• An adjusting error or incorrect adjusting weight will be indicated by the error
message, repeat adjustment procedure.
• KERN UFN
Prior to the next adjustment you will have to relock the access to menu
block “P2 CAL“ by disabling the jumper.
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6.8 Verification
General introduction:
According to EU directive 90/384/EEC balances must be verified if they are used as
follows (legally controlled area):
a) For commercial transactions if the price of goods is determined by weighing.
b) For the production of medicines in pharmacies as well as for analyses in the
medical and pharmaceutical laboratory.
c) For official purposes.
d) For manufacturing final packages.
In cases of doubt, please contact your local trade in standard.
Verification notes:
An EU Qualification Approval is in existence for verified weighing systems. If a
balance is used where obligation to verify exists as described above, it must verified
and re-verified in regular intervals.
Reverification is carried out according to relevant national statutory regulations. The
validity for verification of balances in Germany is e.g. 2 years.
The legal regulation of the country where the balance is used must be observed!
• Verification of the weighing system is invalid without the "seal".
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Notes on verified weighing systems
UFB:
Position for seals and adjustment switches
1. Self-destructing seal
2. Adjustment switch
3. Cover adjustment switch
4. Self-destructing seal
UFN:
Access to conductor plate:
• Remove seal
• How to open the display unit
• For adjustment / access the menu, the jumper [J] has to be set on both pins as
shown in the picture.
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7 Operation
7.1 Start-up
Press , and the instrument will carry out a self-test.
The instrument is ready for weighing when a weight display appears.
7.2 Switching Off
Press until the display disappears.
7.3 Zeroing
Resetting to zero corrects the influence of light soiling on the weighing plate.
Resetting range ± 2 % max.
The instrument comprises an automatic zero setting function, however, the
instrument can be reset to zero whenever needed as described below.
Remove load from weighing system
Press , and the zero display as well as the ZERO indicator will appear.
7.4 Simple weighing
Place goods to be weighed on balance.
Wait for stability display
STABLE.
Read weighing result.
Overload warning
Overloading exceeding the stated maximum load (max) of the device, minus a
possibly existing tare load, must be strictly avoided. The instrument may be
damaged by overloading.
Exceeding of maximum load is indicated by “----“ as well as a signal sound.
Remove load from weighing system or reduce preload.
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7.5 Weighing with tare
Deposit weighing vessel. After successful stop check press the button.
The zero display and the indicator NET appear.
The weight of the container is now internally saved.
Weigh the material, the net weight will be indicated.
The weight of the weighing container will be displayed as a minus number after
removing the weighing container.
The tare procedure can be repeated as many times as necessary, for example
with initial weighing of several components for a mix (add-on weighing). The limit
is reached when the total weighing range capacity is full.
Switch between gross weight and net weight by pressing the key.
To delete the tare value, remove load from weighing plate and press .
7.6 Weighing with tolerance range
You may determine an upper and lower limit for weighing with tolerance limits in
order to ensure that the weighed load remains exactly within the fixed tolerance
limits.
During tolerance checks such as dispensing, portioning and sorting, the instrument
will indicate any lower deviation or exceeding of limits with the help of a visual signal
or acoustic signal.
Acoustic signal:
The acoustic signal depends on the setting of the menu block “BEEP“.
Options:
• no
Acoustic signal turned off
• ok
Acoustic signal sounds when load is within tolerance
limits
• ng
Acoustic signal sounds when load is beyond tolerance
limits
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Optical signal:
Three colour pilot lamps indicate whether load is within the two tolerance limits.
The signal lamps provide the following information:
+
Goods to be weighed above tolerance limit
Red signal lamp
glowing
Goods to be weighed within tolerance range
Green signal lamp
glowing
-
Goods to be weighed below tolerance limit
Red signal lamp
glowing
Settings for tolerance weighing may be set either by calling up menu block “P0 CHK“
(See chpt 8) or by applying the faster option of pressing the key combination
Settings
Press and at the same time in weighing mode.
Press , the display used for entering the lower
limit
SET L appears.
Press , current setting appears.
Use the navigation keys (See chpt 2.1.1) for entering the
lower limit, e.g. 1000 kg; the currently active digit will be
flashing.
Confirm input by .
Select SET H using
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Press , and the current setting for the upper limit will be
shown.
Use the navigation keys (See chpt 2.1.1) to set the upper
limit, e. g. 1100 kg; the currently active digit will be flashing.
Confirm input by .
Select BEEP by .
Press , and the current setting for the acoustic signal will
be shown.
Use (no, ok, ng) to select the desired setting.
Confirm input by .
Press and the weighing system will go into tolerance
weighing mode. From here evaluation takes place whether
the goods to be weighed are within the two tolerance limits.
Weighing with tolerance range
Tare, if using a weighing container.
Put on goods to be weighed, tolerance control is started
• The tolerance control is not active when the weight is under 20d.
• To delete limits enter a value of “00.000 kg“.
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7.7 Manual totalizing
With this function the individual weighing values are added into the summation
memory by pressing and edited, when an optional printer is connected.
• Menu settings:
„P1 COM“ „MODE“ „PR2““, s. Kap. 8
• The totalisation function is not active when the weight is under 20d.
Add up:
Place goods to be weighed A.
Wait until the stability display STABLE appears, then press . The weight value
will be saved and a printout received if an optional printer is connected.
Remove the weighed good. More weighed goods can only be added when the
display = zero.
Place goods to be weighed B.
Wait until the stability display appears, then press . The weight value will be
added to the summation memory and possibly printed. The number of weighing
processes followed by the total weight will be shown for 2 sec.
Add more weighed goods as described before.
Please note that the weighing system must be unloaded between the individual
weighing procedures.
This process can be repeated until the capacity of the weighing system is
exhausted.
Display of the saved weighing data:
Press and the number of weighings followed by the total weight will be
shown for 2 sec. To receive a printout, press during this display.
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Delete weighing data:
Press and at the same time. The data in the summation memory are
deleted.
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1
2
3
4
Printout example:
1 First weighing
2 Second weighing
3 Third weighing
4 Number of weighings / total +
***************
NO. 1
1.000kg
***************
NO. 2
0.500kg
***************
NO. 3
0.700kg
***************
total
NO. 3
2.200kg
7.8 Automatic adding-up
With this function the individual weighing values are automatically added into the
summation memory when the balance is unloaded without pressing and edited,
when an optional printer is connected.
• Menu settings:
„P1 COM“ „MODE“ „AUTO““, see chpt 8
Indicator AUTO is displayed.
Add up:
Place goods to be weighed A.
After the standstill control sounds a signal tone. The weighing value is added to
the summation memory, followed by printing.
Remove the weighed good. More weighed goods can only be added when the
display ≤ zero.
Place goods to be weighed B.
After the standstill control sounds a signal tone. The weighing value is added to
the summation memory, followed by printing. The number of weighings, followed
by the total weight, will be shown for 2 sec.
Add more weighed goods as described before.
Please note that the weighing system must be unloaded between the individual
weighing procedures.
This process can be repeated until the capacity of the weighing system is
exhausted.
Display and delete the weighing data, as well as printout examples see chpt.
7.7.
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7.9 Animal weighing
The animal weighing function is ideal for unstable loads.
The weighing system calculates and displays a stable mean average from several
weighing values.
The animal weighing program may either be enabled by calling up menu block “P3
OTH“ „ANM“ „ON“ (See chpt 8) or by using the faster option of a key
combination.
Place the load onto the weighing system and wait until it is fairly stable.
Press and at the same time, a signal sounds, meaning that the animal
weighing function is enabled.
During the calculation of a mean average you can add or remove loads as the
mean average will be continuously updated.
To disable the animal weighing function press and at the same time.
7.10 Lock keyboard
Go to menu item “P3 OTH“ „LOCK“, see chpt 8, and enable/disable the keyboard
interlock. The enabled function will be locked after 10 minutes of inactivity. “K-LCK“
will be displayed as soon as a key is pressed.
To cancel locking, keep pressed , and at the same time (2s) until “U
LCK“ appears.
7.11 Display background illumination
Keep pressed (3s) until “setbl“ appears.
Press again and the current setting will be displayed.
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Use to select desired setting.
bl on
Background lighting is on continuously
bl off
Background illumination off
bl Auto
Automatic background illumination on when weighing plate is
loaded
Enter by , using save or cancel by .
7.12 Automatic switch-off function “AUTO OFF“
The instrument will switch off automatically after a set time when the display unit or
weighing bridge has been idle.
Keep pressed (3s) until “setbl“ appears.
Call up AUTO OFF function using
Press
current setting appears.
Use to select desired setting.
of on
AUTO OFF function disabled
of 5
Weighing system will switch off after 5 min
of 15
Weighing system will switch off after 15 min
Save entry by or cancel using .
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8 Menu
Navigation in the menu:
Call up menu
Switch on instrument and press during self-test.
Press in turn , , and the first menu block
“PO CHK“ will appear.
Select menu block
With help of , the individual menu items can be
selected one after the other.
Select setting
Confirm selected menu item with . The current
setting will be displayed.
Change settings
Use the navigation keys, see chpt 2.1 to switch between
the available settings.
Acknowledge setting /
exit the menu
Save entry by
or cancel using .
Return to weighing
mode
To exit menu, press repeatedly.
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Overview:
Menu block
Main menu
Menu item
Sub-menu
Available settings / definition
SET H Upper limit, for entry see chpt 7.6
SET L Lower limit, for entry see chpt 7.6
no
Acoustic signal turned off for weighing with
tolerance limits
ok
Acoustic signal sounds if load is within tolerance
limits
PO CHK
Weighing with
Tolerance limits,
see chpt 7.6
BEEP
ng
Acoustic signal sounds if load is beyond
tolerance limits
CONT
Continuous data output
ST1
One output for stable weighing value
STC
Continuous data output of stable
Weighing values
PR1
Output after pressing
PR2
Manual add-up, see chpt 7.7
After pressing
, weighing value will be
added to summation memory and issued.
AUTO
Automatic add-up, see chpt 7.8
This function is used to automatically add and
send individual weighing values to the
summation memory whilst weighing instrument
is being unloaded.
MODE
ASK
Remote control instructions:
R, “read“
T, “tare“
Z, “zeroing“
BAUD Available Baudrate 600, 1200, 2400, 4800, 9600
7E1 7 bits, even parity
7o1 7 bits, odd parity
Pr
8n1 8 bits, no parity
tPUP Standard printer setting
P1 COM
Interface
parameters
PTYPE
LP50 Not documented
COUNT Display internal resolution
DECI Position of the decimal dot
DUAL Weighing scale type, capacity and readability (non-
verified) or verification value (verified).
CAL Adjustment, see chpt 6.7
P2 CAL
Configuration
data
GrA Not documented
on Keyboard interlock enabled
LOCK
off Keyboard interlock disabled
on Animal weighing enabled
P3 OTH
see chap. 7.9 /
7.10
ANM
off Animal weighing disabled
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9 Service, maintenance, disposal
9.1 Cleaning
Before cleaning, disconnect the appliance from the operating voltage.
Please do not use aggressive cleaning agents (solvents or similar agents), but a cloth
dampened with mild soap suds. Take care that the device is not penetrated by fluids
and polish it with a dry soft cloth.
9.2 Service, maintenance
The appliance may only be opened by trained service technicians who are authorized
by KERN.
Before opening, disconnect from power supply.
9.3 Disposal
Disposal of packaging and appliance must be carried out by operator according to
valid national or regional law of the location where the appliance is used.
9.4 Error messages
Error message Description Possible causes
- - - - -
Maximum load exceeded
• Remove load from
weighing system or
reduce preload.
Zeroing range exceeded
due to switching-on balance
or pressing (normally 4%
max)
• Object on the weighing
plate
• Overload when zeroing
• Improper adjustment
• Damaged weighing cell
• Damaged electronics
Value outside the A/D
changer range
• Weighing plate not
installed
• Damaged weighing cell
• Damaged electronics
Should other error messages occur, switch balance off and then on again. If the error
message remains inform manufacturer.
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10 Data output RS 232C
Standard features for display unit (KERN UFB) include an RS 232C interface.
Weighing data can be edited according to menu setting or automatically or by
pressing via the interface.
This data exchange is asynchronous using ASCII - Code.
The following conditions must be met to provide successful communication between
the weighing balance and the printer.
• Use a suitable cable to connect the moisture analyser to the interface of the
printer. Faultless operation requires an adequate KERN interface cable.
• Communication parameters (baud rate, bits and parity) of display unit and
printer must match. For detailed description of interface parameters see chpt
8, menu block „P1 COM“
10.1 Technical Data
Connector 25 pin d-subminiature bushing
Pin 2 input
Pin 3 output
Pin 5 signal earth
Baud rate 600/1200/2400/4800/9600
Parity 8 bits, no parity / 7 bits, even parity / 7 bits, odd parity
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10.2 Printer mode
• Standard printout “weighing data“
ST Stable value
US Instable value
GS Gross weight
NT Net weight
<lf> Space line
<lf> Space line
• Printout “summation memory“
**************
<lf> Space line
TOTAL NO: 3 Number weighing processes
TOTAL wgt.: 0.447KG Total of all individual weighings
**************
10.3 Continuous data output
con1: Weighing mode
HEADER1: ST=STABLE， US=UNSTABLE
HEADER2: NT=NET， GS=GROSS
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11 Instant help
In case of an error in the program process, briefly turn off the display unit and
disconnect from power supply. The weighing process must then be restarted from the
beginning.
Help:
Fault Possible cause
The displayed weight does
not glow.
• The display unit is not switched on.
• Mains power failure (mains cable defective).
• Power supply interrupted.
• (Rechargeable) batteries are inserted incorrectly or
empty
• No (rechargeable) batteries inserted.
The displayed weight is
permanently changing
• Draught/air movement
• Table/floor vibrations
• Weighing plate has contact with other objects.
• Electromagnetic fields / static charging (choose
different location/switch off interfering device if
possible)
The weighing result is
obviously incorrect
• The display of the balance is not at zero
• Adjustment is no longer correct.
• Great fluctuations in temperature.
• Warm-up time was ignored.
• Electromagnetic fields / static charging (choose
different location/switch off interfering device if
possible)
Should other error messages occur, switch display unit off and then on again. If the
error message remains inform manufacturer.
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