KERN KFB-TM Service Manual
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KERN KFB-TM Service Manual

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Servicemanual
Display Unit
KERN KFB/KFN-TM
Version 1.0
03/2018
GB
KERN & Sohn GmbH
Ziegelei 1
D-72336 Balingen
E-Mail: info@kern-sohn.com
Tel: +49-[0]7433- 9933-0
Fax: +49-[0]7433-9933-149
Internet: www.kern-sohn.com
Distributør:
Impex Produkter AS
Gamle Drammensvei 107
1363 Høvik
www.impex.no
info@impex.no
Tel.: 22 32 77 20

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  • Page 1 KERN & Sohn GmbH Ziegelei 1 Tel: +49-[0]7433- 9933-0 D-72336 Balingen Fax: +49-[0]7433-9933-149 E-Mail: info@kern-sohn.com Internet: www.kern-sohn.com Servicemanual Display Unit Distributør: Impex Produkter AS Gamle Drammensvei 107 1363 Høvik KERN KFB/KFN-TM www.impex.no info@impex.no Tel.: 22 32 77 20 Version 1.0...

  • Page 2: Table Of Contents

    INSTALLATION ....................- 4 - Installation ..........................- 4 - Appliance overview ..................- 5 - KFB-TM: Synthetic finish ...................... - 5 - KFN-TM: Stainless steel finish ..................... - 6 - Keyboard overview ........................ - 7 - Numerical input via the navigation buttons ..............- 8 - Overview of display .....................

  • Page 3: Basic Information

    11.3 Unstable ..........................- 43 - 11. CIRCUIT DIAGRAM ................- 44 - DRAWING ....................- 48 - 13.1 Drawing KFB-TM ........................- 48 - 13.2 Parts List ..........................- 49 - 13.3 Drawing KFN-TM ........................- 50 - 13.4 Parts List ..........................

  • Page 4: Installation

     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. KFB-TM/KFN-TM-SH-e-1410 - 4 -...

  • Page 5: Appliance Overview

    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.

  • Page 6: Kfn-Tm: Stainless Steel Finish

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

  • Page 7: Keyboard Overview

    Calculate weighing data via interface  Delete  Change between gross  and net weight  Back to menu/weighing mode  Call up animal weighing function  Call up weighing with tolerance range  Delete total added memory - 7 - KFB-TM/KFN-TM-SH-e-1410...

  • Page 8: Numerical Input Via The Navigation Buttons

    Overview of display Display Significance Battery very low STABLE Stability display ZERO Zero indicator GROSS Gross weight Net weight AUTO Automatic add-up enabled Weighing unit Totalisation Indicators for weighing with tolerance range + / / - KFB-TM/KFN-TM-SH-e-1410 - 8 -...

  • Page 9: Menu

    To change to the available settings, press the navigations keys as described in chap. 2.1. Acknowledge setting /  Either save by pressing or cancel by pressing exit the menu Return to weighing  Press repeatedly to exit menu. mode - 9 - KFB-TM/KFN-TM-SH-e-1410...

  • Page 10: Overview Non Verifiable Weighing Systems (Contacts Of Circuit Board [K1] Not Short- Circuited)

    Zero point setting P2 COM MODE S0 off Continuous data output, CONT selectable “send zero” yes / no Interface S0 on parameter One output for stable weighing value Continuous data output of stable weighing values Output after pressing KFB-TM/KFN-TM-SH-e-1410 - 10 -...
  • Page 11 DUAL Setting balance type, capacity (Max) and readability (d) see chap. 12.4 Single-range balance R1 inc Readability R1 cap Capacity Dual range balance R1 inc Readability 1st weighing range R1 cap Capacity 1st weighing range - 11 - KFB-TM/KFN-TM-SH-e-1410...
  • Page 12 Animal weighing disabled P5 Unt Switch-over weighing unit, see chap. 7.5 off* off* off* P6 xcl Not documented P7 rst to reset balance settings to factory default. P8 uwb Not documented Factory settings are marked by *. KFB-TM/KFN-TM-SH-e-1410 - 12 -...

  • Page 13: Overview Verified Weighing Systems (Contacts Of Circuit Board [K1] Short-Circuited By Means Of Jumper)

    (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.
  • Page 14 Details see following table 1 Prt x Lang Eng* Standard setting English P2 mode SiGr Single-range balance COUNT Display internal resolution DECI Position of the decimal dot Konfigurations- daten Div. Readability [d] / verification value[s] Balance capacity [Max] KFB-TM/KFN-TM-SH-e-1410 - 14 -...
  • Page 15 COUNT Display internal resolution DECI Position of the decimal dot Readability [d] / verification value [e] div. div 1 1. weighing range - 15 - KFB-TM/KFN-TM-SH-e-1410...
  • Page 16 Follow up tare switched on Follow up tare St off Follow up tare switched off P6 SP 7.5, 15, 30 Not documented Tab. 1. Printout examples Standard printer ******************* ******************* ********************** ********************** 5.000kg 5.000kg 5.000kg 5.000kg KFB-TM/KFN-TM-SH-e-1410 - 16 -...

  • Page 17: Service, Maintenance, 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 Description Possible causes message - - - - - Maximum load exceeded  Unload weighing system or reduce - 17 - KFB-TM/KFN-TM-SH-e-1410...
  • Page 18 Err P Printer error Check communication parameters Ba lo /  Battery very low Recharge battery Lo ba Should other error messages occur, switch balance off and then on again. If the error message remains inform manufacturer. KFB-TM/KFN-TM-SH-e-1410 - 18 -...

  • Page 19: Data Output Rs 232C

     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.

  • Page 20: Output Log (Continuous Output)

    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 KFB-TM/KFN-TM-SH-e-1410 - 20 -...

  • Page 21: Instant Help

     Electromagnetic fields / static charging (choose different location/switch off interfering device if possible) The weighing result is  The display of the balance is not at zero obviously incorrect  Adjustment is no longer correct. - 21 - KFB-TM/KFN-TM-SH-e-1410...

  • Page 22: Installing Display Unit / Weighing Bridge

    4 % of the scale’s capacity. The addition of weighing scales capacity, preload and the total zero setting range give the required capacity for the weighing cell. To avoid overloading of the weighing cell, include an additional safety margin. KFB-TM/KFN-TM-SH-e-1410 - 22 -...

  • Page 23: How To Connect The Platform

    9.3 How to connect the platform  Disconnect the display unit from the power supply.  Solder the individual leads of the load cell cable onto the circuit board. See diagrams below. EXC+ SEN+ SIG+ SIG- LOAD CELL SEN- SHIELD EXC- - 23 - KFB-TM/KFN-TM-SH-e-1410...
  • Page 24 Loadcell 6- conductor 4- conductor EXC+ EXC+ SEN+ EXC- EXC- SEN- SHIELD SHIELD SIG- SIG- SIG+ SIG+ KFB-TM/KFN-TM-SH-e-1410 - 24 -...

  • Page 25: Configure Display Unit

    „PO Press CHK“ will be displayed.  repeatedly until „P2 mode“ will be displayed. Press  Operate the adjustment switch (models KFB-TM).  Press and use to select the weighing scales type.  Single-range balance Dual range balance ...
  • Page 26 Readability  Press and current setting will be displayed. Select desired setting by Options 1, 2, 5, 10, 20, 50. Confirm entry by  Press to select the next menu item. KFB-TM/KFN-TM-SH-e-1410 - 26 -...
  • Page 27 Position decimal point  Press , the currently set position of the decimal dot is displayed.  to select the desired setting. Options 0, 0.0, 0.00, 0.000, 0.0000. Confirm input by - 27 - KFB-TM/KFN-TM-SH-e-1410...
  • Page 28  Press and current setting will be displayed.  Select desired setting with and acknowledge by  Press , the unit will return to the menu  Press to select the next menu item. KFB-TM/KFN-TM-SH-e-1410 - 28 -...
  • Page 29 6 or chap. Fehler! Verweisquelle konnte nicht gefunden werden. for linearisation  Acknowledge using , the current setting is displayed.   Acknowledge by , select desired setting with = Adjustment = Linearisation - 29 - KFB-TM/KFN-TM-SH-e-1410...

  • Page 30: Non Verifiable Weighing Systems (Contacts Of Circuit Board [K1] Not Short-Circuited

     Press repeatedly to exit menu. Parameter selection Display internal resolution  Press , the internal resolution will be shown.  Return to menu by  to select another menu item. Position decimal point KFB-TM/KFN-TM-SH-e-1410 - 30 -...
  • Page 31 , the current setting will be shown (such as max. = 2000kg).  Using the navigation buttons (see chap. 2.1.1) select the desired setting, the active digit is flashing.  Acknowledge with In a single-range balance the entry of capacity / readability is - 31 - KFB-TM/KFN-TM-SH-e-1410...
  • Page 32 For carrying out adjustment see chap. Fehler! Verweisquelle konnte nicht gefunden werden./step 4 or chap. Fehler! Verweisquelle konnte nicht gefunden werden. for linearisation  Acknowledge using , the current setting is displayed.   Press to confirm, press to select the desired setting KFB-TM/KFN-TM-SH-e-1410 - 32 -...

  • Page 33: Maintenence

    CAUTION  Permit only qualified persons to service the instrument  Before connecting or disconnecting any components, remove the power.  Failure to observe these precautions bodily harm or damage to or destruction of the equipment. - 33 - KFB-TM/KFN-TM-SH-e-1410...

  • Page 34: General

    The values of the A/D converter are outside Err 6 from the normal range. Remove the weight from the scale if overloaded and make sure the pan is attached. Load cell or the electronics may be faulty. 9.3. Determine the Problem KFB-TM/KFN-TM-SH-e-1410 - 34 -...

  • Page 35: Check The Load Cell

    Check the AC power socket out put voltage.  Voltage must be a -20% and +10% of the normal AC voltage. Adaptor Voltage Check the adaptor output cable connecter voltage  Voltage must be minimum 9VDC and maximum 15VDC - 35 - KFB-TM/KFN-TM-SH-e-1410...

  • Page 36: Pcb Input Voltage

    The battery voltage below the 5.5VDC, replace the battery and install new 6V/4Ah battery. 2. Check the Battery Charging Voltage;  Remove the battery connection terminals (Red and Black) from the battery.  Connect the power and turn on the Indicator  Voltage into the terminal minimum 6.5VDC KFB-TM/KFN-TM-SH-e-1410 - 36 -...

  • Page 37: Problems And Solutions

    Weight value Calibration error. Use accurate weight for to do the incorrect calibration Platform of load cell touching somewhere. Check the pan and load cell is installed Wrong weighing unit proper and touching. Check the parameter settings. - 37 - KFB-TM/KFN-TM-SH-e-1410...
  • Page 38 Use accurate weight for to do the Load cell or mechanism calibration damaged Check the load cell. Battery not Mains voltage problem Check the mains and adaptor. charging Charging circuit problem Check the battery. Battery Problem Check the charging circuit KFB-TM/KFN-TM-SH-e-1410 - 38 -...

  • Page 39: 10. Trouble Shooting

    1 Out put 5V circuit CHK M/B DU3 Check ST and around circuit pin 8 high level Not good when power on and return to low level later. Check ST Not good (11.0592Mhz) Check M/B DU1 and around circuit - 39 - KFB-TM/KFN-TM-SH-e-1410...

  • Page 40: No Display

    Replace IC power problem Check U3 Not good pin 17 Out put 5V Check U1 and around circuit Press key board beeper Check ST and around circuit Not good Not good Check U3 and KFB-TM/KFN-TM-SH-e-1410 - 40 -...

  • Page 41: Battery Not Charging

    Not good Check C1 +9 V Check BR, C1, C2 and around circuit CHK M/B U5 Not good pin2 Check M/B DU5 and around circuit Output > 7V. Check M/B D1, R1 and around circuit - 41 - KFB-TM/KFN-TM-SH-e-1410...

  • Page 42: Not Weighing

    15: 5V Check power circuit Not good Add load on pan, CHK output between Check M/B AU1 and around M/B AU1 pin1 and pin2 circuit signal change (mV) Not Good Check load cell and around circuit KFB-TM/KFN-TM-SH-e-1410 - 42 -...

  • Page 43: Unstable

    11.3 Unstable START Check after warm Humidity Check load cell Sole the touching problem and bracket touching something Check M/B AU1 and around circuit - 43 - KFB-TM/KFN-TM-SH-e-1410...

  • Page 44: 11. Circuit Diagram

    12 11. CIRCUIT DIAGRAM Power Display KFB-TM/KFN-TM-SH-e-1410 - 44 -...
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  • Page 46 KFB-TM/KFN-TM-SH-e-1410 - 46 -...
  • Page 47 - 47 - KFB-TM/KFN-TM-SH-e-1410...

  • Page 48: Drawing

    13 DRAWING 13.1 Drawing KFB-TM KFB-TM/KFN-TM-SH-e-1410 - 48 -...

  • Page 49: Parts List

    Self Thread Screw 3x10 Washer Battery bar Battery 6V/1.2AH Self Thread Screw M3, Hexagon RS-232 port D Connecter Star (+) Screw 3Mx20 Branch pipe Main Serial board Interface Module Back Cover Air Connecter Star (+) Screw M4x16 - 49 - KFB-TM/KFN-TM-SH-e-1410...

  • Page 50: Drawing Kfn-Tm

    13.3 Drawing KFN-TM KFB-TM/KFN-TM-SH-e-1410 - 50 -...

  • Page 51: Parts List

    Star (+) Big head Screw M4x12 Bracket Bracket Screw Water Proof Adaptor jack Interface Module Air connecter 5Pin Plug Rubber Spacer Air Connecter 7Pin Back Cover Air Connecter Water Proof Nut Battery 6V/4Ah M3x6 Main Serial board - 51 - KFB-TM/KFN-TM-SH-e-1410...

  • Page 52: Kfb-Tm/Kfn-Tm-Sh-E

    Spacer Star (+) Screw 3Mx20 Micro Switch Cap KFB-TM/KFN-TM-SH-e-1410 - 52 -...

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