KERN KFB-TM User manual

KERN & Sohn GmbH
Ziegelei 1
D-72336 Balingen
E-Mail: [email protected]
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
[email protected]
Tel.: [phone]

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 -

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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

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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

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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