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KERN MWB series Service Manual

Wheelchair scale
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Service Manual
Wheelchair scale
KERN MWB
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
Importør:
Impex Produkter AS
Gamle Drammensvei 107
1363 Høvik
www.impex.no
info@impex.no
Tel.: 22 32 77 20
MWB-SH-e-1810

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Summary of Contents for KERN MWB series

  • 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 Service Manual Wheelchair scale Importør: Impex Produkter AS KERN MWB Gamle Drammensvei 107 1363 Høvik Version 1.0 www.impex.no 03/2018 info@impex.no Tel.: 22 32 77 20...

  • Page 2: Table Of Contents

    KERN MWB Wheelchair scale Version 1.0 04/2018 Service manual Content Basic Information ....................4 Introdution ......................4 Appliance overview.................... 5 Details ............................6 Overview display ........................7 Overview Keyboard .......................8 Basic Information (General) ................9 Proper use ..........................9 Improper Use .........................9 Warranty ..........................9 Monitoring of Test Resources ....................9...
  • Page 3 13.5 Load Cell Connections ......................19 13.6 Check PCB Voltages ......................20 13.7 PCB Input Voltage ....................... 20 13.8 Check Battery Voltage......................20 13.9 Replace Main Board ......................21 13.10 Replace Battery ....................... 21 Drawing......................22 Schematic ...................... 23 MWB-SH-e-1810.docx...

  • 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 MWB 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.

  • Page 5: Appliance Overview

    3 Appliance overview 1. Cover of weighing cell feet 2. Weighing surface 3. Bubble level 4. Hand grip 5. Connection cable 6. Display Unit Bubble level and handle (2x) Conveyor roller (2x) MWB-SH-e-1810.docx...

  • Page 6: Details

    3.1 Details Display unit rear side Battery compartment Connecting cable display unit - platform MWB-SH-e-1810.docx...

  • Page 7: Overview Display

    3.2 Overview display Display Designation Description GROSS Gross weight display Lights up during indication of the gross weight Net weight display Lights up during indication of the net weight Illuminated after weighing scale was tared ZERO Zeroing display Should the balance not display exactly zero despite empty scale pan, press the button.

  • Page 8: Overview Keyboard

    3.3 Overview Keyboard Button Designation Function ON/OFF button Turn on/off HOLD button Hold function BMI key Calculation of the Body Mass Index In menu:  Confirm selection For numeric entry:  Confirm numerical value In menu: Function key  Call up menu ...

  • Page 9: Basic Information (General)

    Information is available on KERN’s home page (www.kern-sohn.com) with regard to the monitoring of balance test substances and the test weights required for this. In KERN’s accredited DKD calibration laboratory test weights and balances may be calibrated (return to the national standard) fast and at moderate cost.

  • Page 10: Basic Safety Precautions

    5.1 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. 6 Transport and storage 6.1 Testing upon acceptance When receiving the appliance, please check packaging immediately, and the appliance itself when unpacking for possible visible damage.

  • Page 11: Unpacking, Setup And Commissioning

    7 Unpacking, Setup and Commissioning 7.1 Place of installation / place of operation The balances are designed in a way that reliable weighing results are achieved in common conditions of use. You will work accurately and fast, if you select the right location for your balance.

  • Page 12: Menu

    8 Menu 8.1 Navigation in the menu Call up menu  In weighing mode, press and the first function [F1 oFF] will be displayed. Select function  With help of , the individual functions can be selected one after the other. Change settings ...
  • Page 13 Gravity Gravity not documented MWB-SH-e-1810.docx...

  • Page 14: Error Messages

    9 Error Messages Display Description Zero range exceeded (on start-up or when pressing the key)  Load on weighing pan  Excess load, during zero setting of weighing scale  Incorrect adjusting process  Fault on load cell Value outside the A/D converter range ...

  • Page 15: Servicing, Maintenance, Disposal

    10.3 Servicing, maintenance The appliance may only be opened by trained service technicians who are authorized by KERN. Disconnect the scales before opening. 10.4 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.
  • Page 16  The weighing result is The display of the balance is not at zero.  obviously incorrect Adjustment is no longer correct.  Great fluctuations in temperature.  The balance is on an uneven surface.  Electromagnetic fields / static charging (choose different location/switch off interfering device if possible) Should other error messages occur, switch balance off and then on again.

  • Page 17: Adjustment

    1. Carry out adjustment as closely as possible to admissible maximum load of weighing scale. Info about test weights can be found on the Internet at: http://www.kern-sohn.com.  Observe stable environmental conditions. For warm-up time required for...

  • Page 18: Maintenence

    MAINTENENCE 13.1 General If the scale does not operate properly, find out the problem as possible. Determine whether the problem is constant or alternate. Be aware that problems can be caused by mechanical or electrical influences. Check the following.  Water ...

  • Page 19: Load Cell Connections

    13.5 Load Cell Connections Signal Green Supply + Signal Black Supply - White Shield Measuring Points Resistance Red (+ Exc) to White ( –Exc) 420 ±20Ω Green (+Sig) to Black ( –Sig) 350Ω ±5Ω Load cell connection for the 4 load cell’s.

  • Page 20: Check Pcb Voltages

    13.6 Check PCB Voltages If the problem is in the PCB, use a multimeter to check the following voltages 13.7 PCB Input Voltage Check the PCB input power connecter voltage Voltage must be minimum 9VDC in to the pin AD+ 13.8 Check Battery Voltage Check the Battery Voltage The battery voltage below the 1.5VDC, replace the battery and install new...

  • Page 21: Replace Main Board

    13.9 Replace Main Board Release 4 pcs screw from bottom of the scale by using cross screw driver. Open the top cover, the main board lie on top cover, use cross screw driver loose 4 screw for main board, pull out all connector on the main board, then you can bring out main board carefully.

  • Page 22: Drawing

    14 Drawing MWB-SH-e-1810.docx...

  • Page 23: Schematic

    15 Schematic MWB-SH-e-1810.docx...

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