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KERN AEJ-C Service Manual

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Servicemanual
KERN AEJ-C/AES-C/PLJ-C
Version 1.0
10/14
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

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Summary of Contents for KERN AEJ-C

  • 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 KERN AEJ-C/AES-C/PLJ-C Version 1.0 10/14...

  • Page 2: Table Of Contents

    KERN AEJ-C/AES-C/PLJ-C Version 1.0 04/2014 Servicemanual Conntent Basic Information ......................4 Introdution ........................4 BASIC SERVICE EQUIPMENT ..................5 Indispensable part of PLJ-C series precision balances service is qualified personnel as well ........................ 5 Tools and equipment ..........................5 Weights ..............................5 Weighing bench ............................
  • Page 3 11.5 Set of commands ..........................47 11.6 Format of a response to a computer querry ..................48 11.7 ERRORS ..............................48 UNDERSLUNG LOADS WEIGHING ......Fehler! Textmarke nicht definiert. AEJ-C/PLJ-C-SH-e-1410...

  • Page 4: Basic Information

    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. AEJ-C/PLJ-C-SH-e-1410...

  • Page 5: Basic Service Equipment

    Control weights set, which is indispensable for the possible balance adjustment and control must be chosen depending on the balance weighing capacity. Weighing bench The weighing bench must be stable, resistant to any shocks and vibrations. It also must be levelled and placed away from any heat sources. AEJ-C/PLJ-C-SH-e-1410...

  • Page 6: Terms Of Use

    (1), assemble a weighing pan (2) on the rubber bumpers (1), after components assembly, check whether the weighing pan is firmly placed on the rubber bumpers. AEJ-C/PLJ-C-SH-e-1410...

  • Page 7: Levelling

    Unplug the balance before connecting any additional equipment or before replacing it with a new one (printer, PC computer). Only recommended by the producer additional equipment can be connected to the KEYBOARD AND DISPLAY balance. After the connection has been carried out plug the balance. AEJ-C/PLJ-C-SH-e-1410...

  • Page 8: Keyboard (Example: Aej)

    Weighing unit “g“ Button Function  Turn on/off  Invoke data bases  Function key  Selection of operating mode  Invoke adjustment  Call up menu  Taring  Switch-over weighing unit  In menu: Return to weighing mode AEJ-C/PLJ-C-SH-e-1410...

  • Page 9: Display

    During the stabilization process the display readouts may vary. Correct operation of the balance is possible within a temperature range specified in technical parameters and on a data plate. It is recommended to find such a place for balance in operation where the ambient temperature changes are insignificant. AEJ-C/PLJ-C-SH-e-1410...

  • Page 10: Operating The Menu

    Menu can be operated with the use of the balance keyboard: Button Designation Function  Increase flashing digit Navigation button  Decrease flashing digit Navigation button  Digit selection to the right Navigation button Navigation button  Digit selection to the left Confirm entry Navigation button Cancel input AEJ-C/PLJ-C-SH-e-1410...

  • Page 11: Balance Construction - General Description

    • digital module (main board with a screen and a keyboard) • current generator module • interfaces and power supply module Balances are protected against mechanical overload, therefore they are resistant to accidental, small overloads. 7 SCHEMATIC DIAGRAM AEJ-C/PLJ-C-SH-e-1410...

  • Page 12: Balance Assembly

    8 BALANCE ASSEMBLY Balance mechanism AEJ-C/PLJ-C-SH-e-1410...
  • Page 13 No. Number Name of items. Body assembly S40 Solenoid actuator washer Bottom horizontal rocker Bottom horizontal rocker Coil S40 Vertical tare weight Nut M3 Ms Pin M3x30 Body subassembly Position sensor sleeve Position sensor board Screw M3x20 Ms Washer Washer with two holes Spring Screw M3x6 Ms/Ni Sleeve...

  • Page 14: Level Indicator Assembly

    Level indicator assembly Name Diagram number or standard number Level indicator Φ 18x20 Standard level indicator AEJ-C/PLJ-C-SH-e-1410...

  • Page 16: Mechanism And Electronics Assembly

    Mechanism electronics assembly AEJ-C/PLJ-C-SH-e-1410...
  • Page 17 Number Name of items. Foot Reducer sleeve Balance base Screw M4x12 Screw M3x8 Nylon sleeve Driving assembly Nylon sleeve Screw M3x6 Power adapter board Power adapter board Screw M3x20 Fe/Zn Connecting board shield Countersunk screw M3x6 Countersunk screw M3x5 Level indicator base Level indicator washer Level indicator Φ18x20 Connecting wire holder...

  • Page 18: Ballance Assembly

    Ballance assembly AEJ-C/PLJ-C-SH-e-1410...
  • Page 19 Number of items. Name Draft shield for pan 128 Square pan 128 Pan assembly 195 Contact spring Elastic bumper with a hole PS lid for a small pan with a draft shield Lid assembly 128 Lid assembly 195 Transparent square washer Back sleeve –...

  • Page 20: Draft Shield Assembly

    Draft shield base Front glass assembly PS pad Screw for thermoplastics 3x6 Draft shield frame assembly Post Back glass Left glass assembly Screw M8x12 Hole plug Top glass assembly Right glass assembly Adjusting washer Teflon strip Angle section Crimping nut AEJ-C/PLJ-C-SH-e-1410...

  • Page 21: Electrical Connection Diagram

    Electrical connection diagram 360RXlO<X tape T3 A-coil wire E- tape T1 temperature sensor F -wire PSK1 C -tape T2 - 21 RADWAG- January 2014...

  • Page 22: Typical Errors Removal

    If –NULL- message occurs a detailed conversation with a user is required in order to settle down the reason. Such an error usually appears once and it is caused by mistakes during the activation process of the balance: • balance activated without a pan • improperly installed pan Before service works a technician must: AEJ-C/PLJ-C-SH-e-1410...
  • Page 23 -LH- – means too great coil deflection, lack of the coil operation control (in a position sensor) and lack of a reading of the coil CAUTION: All of these above mentioned errors may be caused by a single shock or by a permanent mechanism failure. AEJ-C/PLJ-C-SH-e-1410...

  • Page 24: The Most Frequent Problems Location, Ways Of Control And Solutions

    Repositioning of the the springy elements. Replace faulty internal calibration Inspect the mechanism elements with the new weights. elements to evaluate if ones. they have not seized. *Set the weights. AEJ-C/PLJ-C-SH-e-1410...
  • Page 25 LACK OF Incorrectly set balance Set transmission Replace BALANCE- transmission parametres connecting wire. COMPUTER parameters. Broken correctly. Replace TRANSMISSI Cable RS. Broken Check the RS cable. electronics board. cable. Broken RS Check the RS connecting wire. connecting wire. AEJ-C/PLJ-C-SH-e-1410...

  • Page 26: Service Mode

    9. After the balance activation procedure has been carried out the icon will be displayed, to enter a service mode press the <SETUP> button, which is to be found on a balance keyboard. 10.Name of the parameter group, Parameter P0, will be displayed. AEJ-C/PLJ-C-SH-e-1410...
  • Page 27 In menu: Return to weighing mode Navigation button  Increase flashing digit Navigation button  Decrease flashing digit Navigation button  Digit selection to the right Navigation button  Digit selection to the left Navigation button Confirm entry Cancel input AEJ-C/PLJ-C-SH-e-1410...
  • Page 28 P0.1.6 – READ. DIV 1 Selection of a reading unit for a single range balance  0,00002 or a 1st range reading unit for a dual range balance.  0,00005  0,0001  0,0002  0,0005  0,001    AEJ-C/PLJ-C-SH-e-1410...
  • Page 29 P0.1.14 – MASA KAL. Z. Mass of an external calibration weight. Mass of an internal calibration weight. If <0> value is P0.1.15 – MASA KAL. W. set, the program accepts the balance as a balance with an external calibration only. AEJ-C/PLJ-C-SH-e-1410...
  • Page 30 (over ±10% of a max weighing capacity) a right error sign is displayed. The error sign informs if the mass is too great or too low. In such a case balance will not activate. Error reason must be AEJ-C/PLJ-C-SH-e-1410...
  • Page 31 Not used for balanced with an internal calibration.  NONE P0.1.22 – CLIENT In case of products exported for KERN, „D” value  D must be chosen – a parameter changing the  A balances names: AS-AE, PS-PL, APP-IL, it blocks...
  • Page 32 AEJ-C/PLJ-C-SH-e-1410...
  • Page 33 P0.2 - CALIBRATION Service calibration procedure with the use of an internal P0.2.1 – INT. CALIB. Function calibration weight AEJ-C/PLJ-C-SH-e-1410...
  • Page 34 Start mass value given in units taken from digital P0.2.5 – FCT. S. MASS converter and read during service calibration Value of a calibration coefficient, which was P0.2.6 – FCT. CAL. CF. calculated during service calibration AEJ-C/PLJ-C-SH-e-1410...
  • Page 35  0.4 temperature value is reached.  0.5  0.6  0.8  1  1.5  2  2.5  3  4  5  6  8  10 AEJ-C/PLJ-C-SH-e-1410...
  • Page 36 Time measured from a moment of the balance operation start to the 2 forced internal calibration, given in minutes. P0.2.16 – CAL. TIME 3 Time measured from a moment of the balance operation start to the 3 forced internal calibration, given in minutes. AEJ-C/PLJ-C-SH-e-1410...
  • Page 37 It must be remembered that a balance has to stay for an accordingly long amount of time (about 8 hours) in a   given temperature conditions (either 15 C or 35 C) for stabilization of the balance inside temperature. AEJ-C/PLJ-C-SH-e-1410...
  • Page 38 It must be remembered that a balance has to stay for an accordingly long amount of time (about 8 hours) in a given   temperature conditions (either 15 C or 35 C) for stabilization of the balance inside temperature. AEJ-C/PLJ-C-SH-e-1410...
  • Page 39 P0.4.4 – T.L.C. UP Correction for TCL function for 35C. P0.4.5 – T.L.C. TDN Correction for TCL function for 15C. funkcja Function allowing for assigning the current P0.4.6 – READ ,REF_T temperature of a balance as a reference temperature AEJ-C/PLJ-C-SH-e-1410...
  • Page 40 Max balance and ½ of Max balance. Example procedure below. Before getting back to the weighing procedure the balance must be calibrated. P0.5.2 - COEFF. A parabolic linearity coefficient A P0.5.3 - COEFF. B parabolic linearity coefficient B AEJ-C/PLJ-C-SH-e-1410...
  • Page 41 P0.6 - SECTION LINEARITY Function Parameter allows for declaring mass for each step of the linearity. Corrections made for P0.6.1 - DETERMINE inserted points get zero values. Edition of corrections is possible at the next parameter level: P0.6.2 – CHANGE COR. AEJ-C/PLJ-C-SH-e-1410...
  • Page 42 Function allows for edition of the correction P0.6.2 – CHANGE COR. values for a particular linearity points. AEJ-C/PLJ-C-SH-e-1410...
  • Page 43 Parameter allows for deleting of all the points P0.6.3 – DEL. COR. and their corrections. P0.9 - BOOTLOADER Function allowing for the balance program update with the use of a <STMicroelectronics flash loader> program. Only for KERN service engineer possible. AEJ-C/PLJ-C-SH-e-1410...

  • Page 44: Cooperation With A Printer Or With A Computer

    12.1 Interfaces cables - diagrams Cable balance - PC (RS232) CAUTION: Cables connected to all balance communication interfaces must be screened cables, as it has been shown in the picture above. Cables delivered by the producer assure correctness of operation and electromagnetic compatibility. AEJ-C/PLJ-C-SH-e-1410...

  • Page 45: Format Of Data Sent After Pressing A Print Button

    - [^] – if error of ‘+’ range exciding occurs - [v] – if error of ‘-‘ range exciding occurs - [space] – for positive values or [-] for negative values character - 9 characters – right justification mass - 3 characters – left justification unit AEJ-C/PLJ-C-SH-e-1410...

  • Page 46: Format Of Data Sent For Commands Generated By The Computer

    - [^] – if error of ‘+’ range exciding occurs - [v] – if error of ‘-‘ range exciding occurs - [space] – for positive values or [-] for negative values character - 9 characters – right justification mass - 3 characters – left justification unit AEJ-C/PLJ-C-SH-e-1410...

  • Page 47: Communication Protocol

    Turn off the permanent transmission in current unit Send the balance settings (parameters values) Send all the implemented commands CAUTION: 1. Each of the commands must be finished with CR LF characters; Space characters given in formats must be omitted, they serve only for clarity purposes. AEJ-C/PLJ-C-SH-e-1410...
  • Page 48 12.7 ERRORS -Err2- Value not within the zeroing range, -Err3- Value not within the taring range, -Err8- Exceeded taring/zeroing time limit, -NULL- Zeroing value from the transducer/converter, -FULL- Exceeded weighing range, -HI- Exceeded display state, -LH- Start mass error, AEJ-C/PLJ-C-SH-e-1410...

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