KERN KFB-TM User manual

KERN & Sohn GmbH
Tel: +49-[0]7433- 9933-0
Fax: +49-[0]7433-9933-149
Internet: www.kern-sohn.com
Servicemanual
Display Unit
KERN KFB/KFN-TM
Version 1.0
03/2018
GB
Distributør:
Impex Produkter AS
Gamle Drammensvei 107
1363 Høvik
www.impex.no
Tel.: 22 32 77 20

KFB-TM/KFN-TM-SH-e-1410 - 2 -
GB
KERN KFB/KFN-TM
Version 1.0 01/2015
Servicemanual
Content
1Basic Information...........................................................................................- 3 -
2Introdution......................................................................................................- 3 -
3INSTALLATION...............................................................................................- 4 -
3.1 Installation..............................................................................................................................- 4 -
4Appliance overview........................................................................................- 5 -
4.1 KFB-TM: Synthetic finish......................................................................................................- 5 -
4.2 KFN-TM: Stainless steel finish.............................................................................................- 6 -
4.3 Keyboard overview................................................................................................................- 7 -
Numerical input via the navigation buttons................................................................ - 8 -
Overview of display ..................................................................................................... - 8 -
5Menu................................................................................................................- 9 -
5.1 Overview non verifiable weighing systems (contacts of circuit board [K1] not short-
circuited)...........................................................................................................................................- 10 -
5.2 Overview verified weighing systems (contacts of circuit board [K1] short-circuited by
means of jumper).............................................................................................................................- 13 -
6Service, maintenance, disposal..................................................................- 17 -
6.1 Clean.....................................................................................................................................- 17 -
6.2 Service, maintenance..........................................................................................................- 17 -
6.3 Disposal................................................................................................................................- 17 -
6.4 Error messages....................................................................................................................- 17 -
7Data output RS 232C....................................................................................- 19 -
7.1 Technical data......................................................................................................................- 19 -
7.2 Printer mode.........................................................................................................................- 19 -
7.3 Output log (continuous output) .........................................................................................- 20 -
7.4 Remote control instructions...............................................................................................- 20 -
8Instant help...................................................................................................- 21 -
9Installing display unit / weighing bridge....................................................- 22 -
9.1 Technical data......................................................................................................................- 22 -
9.2 Weighing system design ....................................................................................................- 22 -
9.3 How to connect the platform..............................................................................................- 23 -
9.4 Configure display unit.........................................................................................................- 25 -
Verified weighing systems (contacts of circuit board [K1] short-circuited by means of
jumper) - 25 -
Non verifiable weighing systems (contacts of circuit board [K1] not short-circuited ).... -
30 -
10 MAINTENENCE .........................................................................................- 33 -
10.1 General .................................................................................................................................- 34 -

- 3 - KFB-TM/KFN-TM-SH-e-1410
10.2 Error Codes..........................................................................................................................- 34 -
10.3 Check the Load cell.............................................................................................................- 35 -
10.4 Check Indicator Voltages....................................................................................................- 35 -
AC Power ................................................................................................................... - 35 -
Adaptor Voltage ........................................................................................................ - 35 -
PCB Input Voltage...................................................................................................... - 36 -
Check Battery Voltage and Charging Voltage............................................................ - 36 -
10.5 Problems and Solutions .....................................................................................................- 37 -
11 10. TROUBLE SHOOTING ........................................................................- 39 -
11.1 No Power ..............................................................................................................................- 39 -
No Display........................................................................................................................................- 40 -
Battery not charging .......................................................................................................................- 41 -
11.2 Not Weighing........................................................................................................................- 42 -
11.3 Unstable................................................................................................................................- 43 -
12 11. CIRCUIT DIAGRAM.............................................................................- 44 -
13 DRAWING..................................................................................................- 48 -
13.1 Drawing KFB-TM..................................................................................................................- 48 -
13.2 Parts List ..............................................................................................................................- 49 -
13.3 Drawing KFN-TM..................................................................................................................- 50 -
13.4 Parts List ..............................................................................................................................- 51 -
1 Basic Information
The device must be repaired only by trained specialist staff or personnel with professional formation
(such as a repair-specialist accredited by law concerning verification). The service manual is obligatory
for repair work. After repair, original conditions of the device have to be restored. Only original spare
parts should be used.
Instructions about conformity-evaluated scales:
Repair must be carried only at 100% compliance with the type approval. A violation of this
specification will result in a loss of the type approval! After successful repair the balance will have to
be reverified before it can be used again in a statutorily regulated field.
Detailed instructions about conformity-evaluated scales:
Repair must be carried only at 100% compliance with the type approval. A violation of this
specification will result in a loss of the type approval!
After successful repair the balance will have to be reverified before it can be used again in a statutorily
regulated field.
2 Introdution
This service manual covers the EOA series and is edited for the authorized servicing personnel.
Note all rights are reserved. Copying any part of this manual is prohibited without our permission.

KFB-TM/KFN-TM-SH-e-1410 - 4 -
In this lineup it is an eco product, Therefore, it is not intended to represent the repair manual in detail,
since the construction of the balance is very simple. It is therefore only referring to the list of related to
disposal spare parts.
3 INSTALLATION
Precautions
The weighing indicator is a precision electronic instrument, handle it
carefully.
Do not install the scale in direct sunlight.
Verify the local voltage and receptacle type are correct for
the scale.
Only use original adaptor, other could cause damage to the scale.
Pluggable equipment must be installed near an easily accessible
socket outlet.
Avoid unstable power sources. Do not use near large users of
electricity such as welding equipment or large motors.
Avoid sudden temperature changes, vibration, wind and water.
Avoid heavy RF noise.
Keep the indicator clean.
3.1 Installation
Place the Indicator on a table or connect with proper stand.
Connect the plat form load cell cable in to the indicator load cell connecter. Load cell
connecter is locating back side of the indicator.
Connect the adaptor pin in to the indicator adaptor jack.
Adaptor jack is locating, back side of the indicator.
Adaptor connects into your AC power socket. Pluggable
equipment must be installed near an easily accessible socket outlet with a protective
ground/ earth contact.
Turn on the On/Off key. If you want to turn off, press the key again.
Display will be show the scale capacity and will be starting self checking.
After self checking, display will be come to normal weighing mode.
Warm-up time of 15 minutes stabilizes the measured values after switching on.
Calibrate with exact calibration weights, minimum 1/3 of the scale capacity want to
use for calibration. For calibration see details in parameter.

- 5 - KFB-TM/KFN-TM-SH-e-1410
Then you can start your operation
4 Appliance overview
4.1 KFB-TM: Synthetic finish
1. Status of rechargeable battery
2. Keyboard
3. Weight display
4. Tolerance margin, see chap. 7.7
5. Weighing unit
6. RS-232
7. Input connection load cell cable
8. Guide rail support base / stand
9. End stop support base / stand
10. Mains adapter connection

KFB-TM/KFN-TM-SH-e-1410 - 6 -
11. Adjustment switch
4.2 KFN-TM: Stainless steel finish
1. Status of rechargeable battery
2. Keyboard
3. Weight display
4. For tolerance mark see chap. 7.7
5. Weighing unit
6. Input connection load cell cable
7. Mains adapter connection

- 7 - KFB-TM/KFN-TM-SH-e-1410
4.3 Keyboard overview
Key
Function
Turn on/off
Zeroing
Navigation button
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 to summation memory
Navigation key
Digit selection to the left
Calculate weighing data via interface
C
Delete
Change between gross and net weight
ESC
Back to menu/weighing mode
Call up animal weighing function
Call up weighing with tolerance range
Delete total added memory

KFB-TM/KFN-TM-SH-e-1410 - 8 -
Numerical input via the navigation buttons
Press and current setting will be displayed. The first digit will be flashing and is
ready for changing.
If you do not wish to change the first digit, press and the second digit will start
flashing.
Each time you press , the display will move to the subsequent digit, after the last
digit the display will return to the first digit.
To change the selected (flashing) digit, press repeatedly until the desired value is
displayed. Then press to access further digits and change them by .
Complete your entry by .
Overview of display
Display
Significance
Battery very low
STABLE
Stability display
ZERO
Zero indicator
GROSS
Gross weight
NET
Net weight
AUTO
Automatic add-up enabled
Kg
Weighing unit
M+
Totalisation
LED
+ / / -
Indicators for weighing with tolerance range

- 9 - KFB-TM/KFN-TM-SH-e-1410
5 Menu
The application of the display unit as a verified weighing system requires that you short-
circuit the two contacts [K1] of the circuit board, using a jumper. To that effect, a menu for
verified weighing systems is available. For menu layout see chap. 8.2.
There is no jumper for weighing systems that cannot be verified. To that effect, a menu is
available for weighing systems that cannot be verified, Menu layout
see chap. 8.1
Navigation in the menu:
Call up menu
Switch-on balance and during the selftest press .
Press , , subsequently, the first menu block
„PO CHK“ will be displayed.
Select menu block
With help of , the individual menu items can be selected
one after the other.
Select setting
Confirm selected menu item by pressing . The current
setting will be displayed.
Change settings
To change to the available settings, press the navigations
keys as described in chap. 2.1.
Acknowledge setting /
exit the menu
Either save by pressing or cancel by pressing .
Return to weighing
mode
Press repeatedly to exit menu.

KFB-TM/KFN-TM-SH-e-1410 - 10 -
5.1 Overview non verifiable weighing systems
(contacts of circuit board [K1] not short-circuited)
Menu block
Main menu
Menu item
Submenu
Available settings / explanation
PO CHK
Weighing with
tolerance range,
see chap. 7.7
nEt H
Upper limit value „Tolerance check weighing“, input see
chap. 7.7.1
nEt LO
Lower limit value „Tolerance check weighing“, input see
chap. 7.7.1
PCS H
Upper limit value „Tolerance check counting“, input see
chap. 7.7.2
PCS L
Lower limit value „Tolerance check counting“, input see
chap. 7.7.2
BEEP
no
Acoustic signal for weighing with tolerance range
switched off
ok
Audio sound when load is within tolerance limits
nG
Audio sound when load is beyond tolerance limits
P1 REF
Zero point
settings
A2n0
Automatic zero point correction (Autozero) by changing the
display, digits selectable (0.5d, 1d, 2d, 4d)
0AUto
Zero setting range
Load range where the display after switching-on the
balance is set to zero.
Selectable 0, 2, 5, 10, 20, 30, 50, 100 %
0rAGE
Zero setting range
Load range where the display is set to zero by pressing
. Selectable 0, 2, 4, 10 , 20* , 50, 100%.
0tArE
Automatic taring „on / off“, taring range adjustable in menu
item „0Auto“.
SPEEd
Not documented
Zero
Zero point setting
P2 COM
Interface
parameter
MODE
CONT
S0 off
Continuous data output,
selectable “send zero” yes / no
S0 on
ST1
One output for stable weighing value
STC
Continuous data output of stable weighing
values
PR1
Output after pressing

- 11 - KFB-TM/KFN-TM-SH-e-1410
PR2
Manual totalizing, see chap. 7.8.
Press and the weighing value will be
added to the summation memory and issued.
AUTO*
For automatic add-up see chap. 7.9.
This function is used to issue and add individual
weighing values automatically to the summation
memory on unloading of weighing scale.
ASK
For remote control commands, see chap. 10.4
wirel
Not documented
BAUD
Available Baudrate: 600, 1200, 2400, 4800, 9600*
Pr
7E1
7 bits, even parity
7o1
7 bits, odd parity
8n1*
8 bits, no parity
PTYPE
tPUP*
Standard printer setting
LP50
Not documented
Lab
Lab x
For data output format, see chap.8.2, tab. 1
Prt
Prt x
LAnG
eng*
Standard settings English
chn
P3 CAL
Configuration
data
see chap. 12.4
COUNT
Display internal resolution
DECI
Position of the decimal dot
DUAL
Setting balance type, capacity (Max) and readability (d)
off
Single-range balance
R1 inc
Readability
R1 cap
Capacity
on
Dual range balance
R1 inc
Readability 1st weighing range
R1 cap
Capacity 1st weighing range

KFB-TM/KFN-TM-SH-e-1410 - 12 -
R2 inc
Readability 2nd weighing range
R2 cap
Capacity 2nd weighing range
CAL
noLin
For adjustment, see chap. 6.9.2
Liner
For linearization, see chap. 6.10.2
GrA
Not documented
P4 OTH
LOCK
on
Keyboard lock enabled, see chap. 7.11
off*
Keyboard lock disabled
ANM
on
Animal weighing enabled, see chap. 7.10
off*
Animal weighing disabled
P5 Unt
Switch-over
weighing unit,
see chap. 7.5
kg
on*
off
g
on
off*
lb
on
off*
oz
on
off*
tJ
on
off
HJ
on
off
P6 xcl
Not documented
P7 rst
Use to reset balance settings to factory default.
P8 uwb
Not documented
Factory settings are marked by *.

- 13 - KFB-TM/KFN-TM-SH-e-1410
5.2 Overview verified weighing systems
(contacts of circuit board [K1] short-circuited by means of jumper)
In verified weighing systems the access to „P2 mode and „P4 tAr“ is locked.
KERN KFB-TM:
To disable the access lock, destroy the seal and actuate the adjustment switch.
Position of the adjustment switch see chap. 6.11.
KERN KFN-TM:
In order to unlock the access, the seal must be destroyed and both contacts of the
printed circuit board [K2] must be short-circuited by a jumper, see chap. 6.11.
Attention:
After destruction of the seal the weighing system must be re-verified by an
authorised agency and a new verification wire/seal mark fitted before it can be
reused for applications subject to verification.
Menu block
Main menu
Menu item
Submenu
Available settings / explanation
PO CHK
Weighing with
tolerance range,
see chap. 7.7
nEt H
Upper limit value „Tolerance check weighing“, input see
chap. 7.7.1
nEt LO
Lower limit value „Tolerance check weighing“, input see
chap. 7.7.1
PCS H
Upper limit value „Tolerance check counting“, input see
chap. 7.7.2
PCS L
Lower limit value „Tolerance check counting“, input see
chap. 7.7.2
BEEP
no
Acoustic signal for weighing with tolerance
range switched off
ok
Audio sound when load is within tolerance
limits
ng
Audio sound when load is beyond tolerance
limits
P1 COM
Interface
parameter
MODE
CONT
S0 off
Continuous data output,
selectable “send zero” yes / no
S0 on
ST1
One output for stable weighing value
STC
Continuous data output of stable weighing
values

KFB-TM/KFN-TM-SH-e-1410 - 14 -
PR1
Output after pressing
PR2
Manual totalizing, see chap. Fehler!
Verweisquelle konnte nicht gefunden
werden.
Press and the weighing value will be
added to the summation memory and issued.
AUTO
For automatic totalizing see chap. Fehler!
Verweisquelle konnte nicht gefunden
werden.
This function is used to issue and add
individual weighing values automatically to the
summation memory on unloading of weighing
scale.
ASK
For remote control commands, see chap. 7.4
wireless
Not documented
baud
Available Baudrate: 600, 1200, 2400, 4800, 9600
Pr
7E1
7 bits, even parity
7o1
7 bits, odd parity
8n1
8 bits, no parity
PtYPE
tPUP
Standard printer setting
LP50
Not documented
Lab
Lab x
Details see following table 1
Prt
Prt x
Lang
Eng*
Standard setting English
Chn
P2 mode
Konfigurations-
daten
SiGr
Single-range balance
COUNT
Display internal resolution
DECI
Position of the decimal dot
Div.
Readability [d] / verification value[s]
CAP
Balance capacity [Max]

- 15 - KFB-TM/KFN-TM-SH-e-1410
CAL
noLin
Adjustment, see chap. Fehler!
Verweisquelle konnte nicht
gefunden werden.
LinEr
Linearisation, see chap. Fehler!
Verweisquelle konnte nicht
gefunden werden.
GrA
Not documented
dUAL 1
Dual range balance
Balance with two weighing ranges and different maximum load
and weighing ranges and interval sizes but only one load-
supporting pan, whereby each range extends from zero to the
respective maximum capacity. When load is removed, weighing
scales will remain in 2nd range.
COUNT
Display internal resolution
DECI
Position of the decimal dot
div.
div 1
Readability [d] / verification value [e]
1. weighing range
div 2
Readability [d] / verification value [e]
2. weighing range
CAP
CAP 1
Weighing scale capacity [max]
1. Weighing range
CAP 2
Weighing scale capacity [max]
2. Weighing range
CAL
noLin
Adjustment, see chap. 6.9
LinEr
For linearization, see chap. Fehler!
Verweisquelle konnte nicht
gefunden werden.
GrA
Not documented
dUAL 2
Multi-interval balance
Weighing scales with one weighing range subdivided into partial
weighing ranges, each providing a different scale interval. The
scale interval depends on the applied load and is automatically
changed during loading and unloading.
COUNT
Display internal resolution
DECI
Position of the decimal dot
div.
div 1
Readability [d] / verification value [e]
1. weighing range

KFB-TM/KFN-TM-SH-e-1410 - 16 -
div 2
Readability [d] / verification value [e]
2. weighing range
CAP
CAP 1
Weighing scale capacity [max]
1. Weighing range
CAP 2
Weighing scale capacity [max]
2. Weighing range
CAL
noLin
Adjustment, see chap. Fehler!
Verweisquelle konnte nicht
gefunden werden.
LinEr
Linearisation, see chap. Fehler!
Verweisquelle konnte nicht
gefunden werden.
GrA
Not documented
P3 OTH
s. Kap. 7.10 / 7.11
LOCK
on
Keyboard lock enabled
off
Keyboard lock disabled
ANM
on
Animal weighing enabled
off
Animal weighing disabled
P4 tAr
Restricted taring
range
Press , the current setting will be displayed. Using the
navigation buttons (see chap. 2.1.1) select the desired setting, the
active digit is flashing.
Confirm input by .
P5 St
Follow up tare
St on
Follow up tare switched on
St off
Follow up tare switched off
P6 SP
7.5, 15, 30
Not documented
Tab. 1. Printout examples Standard printer
Lab
Prt
0
1
2
3
0~3
*******************
GS: 5.000kg
*******************
NT: 5.000kg
**********************
GS: 5.000kg
**********************
NT: 5.000kg

- 17 - KFB-TM/KFN-TM-SH-e-1410
*******************
TW: 5.000kg
GW: 10.000kg
*******************
TOTAL: 10.000kg
**********************
TW: 5.000kg
GW: 10.000kg
TOTAL: 10.000kg
**********************
4~7
*******************
No.: 1
GS: 5.000kg
*******************
*******************
No.: 1
NT: 5.000kg
TW: 5.000kg
GW: 10.000kg
*******************
**********************
No.: 1
GS: 5.000kg
TOTAL: 10.000kg
**********************
**********************
No.: 1
NT: 5.000kg
TW: 5.000kg
GW: 10.000kg
TOTAL: 10.000kg
**********************
GS / GW
Gross weight
NO
Number weighing processes
NT
Net weight
TOTAL
Total of all individual weighings
TW
Tare weight
6 Service, maintenance, disposal
6.1 Clean
Before cleaning, disconnect the appliance from the operating voltage.
Do not use aggressive detergents (solvents or similar).
6.2 Service, maintenance
The appliance may only be opened by trained service technicians who are authorized by
KERN.
Before opening, disconnect from power supply.
6.3 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.
6.4 Error messages
Error
message
Description
Possible causes
- - - - -
Maximum load exceeded
Unload weighing system or reduce

KFB-TM/KFN-TM-SH-e-1410 - 18 -
- - ol - -
preload.
Err 1
Incorrect data input
Follow format “yy:mm:dd“
Err 2
Incorrect time entry
Follow format “hh:mm:ss“
Err 4
Zeroing range exceeded due to
switching-on balance or pressing
(normally 4% max)
Object on the weighing plate
Overload when zeroing
Err 5
Keyboard error
Err 6
Value outside the A/D changer
range
Weighing plate not installed
Damaged weighing cell
Damaged electronics
Err 9
Stability display does not appear
Check the environmental conditions.
Err 10
Communication error
No data
Err 15
Gravitation error
Range 0.9 ~ 1.0
Err 17
Taring range exceeded
Reduce load
Fai l h /
Fai l l
Adjustment error
Repeat adjustment.
Err P
Printer error
Check communication parameters
Ba lo /
Lo ba
Battery very low
Recharge battery
Should other error messages occur, switch balance off and then on again. If the error
message remains inform manufacturer.

- 19 - KFB-TM/KFN-TM-SH-e-1410
7 Data output RS 232C
You can print weighing data automatically via the RS 232C interface or manually by pressing
via the interface according to the setting in the menu.
This data exchange is asynchronous using ASCII - Code.
The following conditions must be met to provide successful communication between the
weighing system and the printer.
Use a suitable cable to connect the display unit 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 a detailed description of interface parameters see chap. Fehler!
Verweisquelle konnte nicht gefunden werden., menu block „P1 COM“ or ‚“P2
COM“
7.1 Technical data
Connection
9 pin d-subminiature bushing
Pin 2 input
Pin 3 output
Pin 5 signal earth
Baud rate
Optional 600/1200/2400/4800/9600
Parity
8 bits, no parity / 7 bits, even parity / 7 bits, odd parity
7.2 Printer mode
Printout examples (KERN YKB-01N):
Weighing
ST, GS 1.000kg

KFB-TM/KFN-TM-SH-e-1410 - 20 -
Symbols:
ST
Stable value
US
Instable value
GS / GW
Gross weight
NT
Net weight
TW
Tare weight
NO
Number weighing processes
TOTAL
Total of all individual weighings
<lf>
Space line
<lf>
Space line
Counting
7.3 Output log (continuous output)
Weighing
HEADER1: ST=STABLE,US=UNSTABLE
HEADER2: NT=NET,GS=GROSS
7.4 Remote control instructions
Command
Function
Printout examples
****************************
PCS 100
****************************
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