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Related Manuals for KERN MWA NM Series
Summary of Contents for KERN MWA NM 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 Multi-function weighing balance KERN MWA_NM Type MWA300K-1NM Type MWA300K-1PNM 07/2018 MWA_NM-SH-e-1810...
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Page 2: Table Of Contents
KERN MWA_NM Version 1.0 07/2018 Servicemanual Contents Basic Information................... 3 Appliance overview ..................4 Keyboard overview ..................7 Overview of display ..................8 Balance assembly and installation ..................... 9 Mains connection ........................9 Battery operation is possible by obtaining an optional battery power pack....... 9 Battery operation ........................ -
Page 3: Basic Information
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. -
Page 4: Appliance Overview
2 Appliance overview The wheelchair platform scale MWA-NM with folded and unfolded ramps and the display (serial The wheelchair platform scale fitting). MWA-PNM with folded and unfolded ramps, the display and the rail with a stand (serial fitting). The possibility of retrofitting with rail MWA-A02 (without a stand). - Page 5 Weighing balance suitable as wheelchair or stand assist balance. 1. Display Unit 2. Handrail optional MWA-A01with tripod (cannot be retrofitted) MWA-A02 without tripod 3. Ramps 4. Bubble level 5. Carrying handle Wheelchair balance Suitable as wheelchair and Handrail collapsible stand assist balance (Collapsible ramps) Assembly of the rail: Carefully mount the rail and fasten it...
- Page 6 Display unit back 6. Adjustment switch 7. Terminal power supply unit 8. Connecting cable ”display unit - platform" 9. Connector RS232 Display unit at rear 5 Rechargeable battery / battery compartment 6 Mains port 7 RS 232 C 8 Adjustment switch MWA_NM-SH-e-1810...
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Page 7: Keyboard Overview
3 Keyboard overview Type MWA 300K-1NM Type MWA 300K-1PNM Button Designation Function ON/OFF button Turn on/off Hold function /determination of stable weighing value Hold-key Print (press and hold for a while):Data transmission via Print-key interface RS 232 Determination of body mass index BMI key In the menu: ... -
Page 8: Overview Of Display
4 Overview of display Display Designation Description Stability display Scales are in a steady state Zeroing display Should the balance not display exactly zero despite empty weighing plate, press button.Your balance will be set to zero after a short standby time. Net weight display Illuminated when net weight is displayed Illuminated after weighing scale was... -
Page 9: Balance Assembly And Installation
The stated voltage value must be the same as the local voltage. Always use genuine approved KERN power pack units as per EN 60601-1 directive. The small sticker attached to the side of the display unit indicates the power port: The LED remains illuminated as long as the weighing scale remains connected to the mains. -
Page 10: Battery Operation
Rechargeable battery very low. Rechargeable battery completely reloaded If the balance is not used for a longer time, take out the rechargeable battery and store it separately. Leaking liquid could damage the balance. 4.4 Battery operation As an alternative to rechargeable battery operation, the balance may also be operated with 6x AA batteries. -
Page 11: Menu
5 Menu Access to service menu „tCH“ is locked in verified balances. To disable the access lock, destroy the seal and actuate the adjustment switch.For position of adjustment switch, see chap. 17. 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. -
Page 12: Menu Overview
5.2 Menu overview Function Settings Description oFF 0* Automatic shutdown off oFF 3 Automatic shutdown after 3 min. Automatic cutout oFF 5 Automatic shutdown after 5 min. Auto Off oFF 15 Automatic shutdown after 15 min. oFF 30 Automatic shutdown after 30 min. bl on Back lighting for display on bl oFF... - Page 13 Data output format (Setting P Prt, P Auto, P Cont only!) The currently set data output format will be displayed after the Baud rate has been confirmed.Select desired format by and confirm with Sd0 – on/off Cont 1 Default Continuous data output, selectable “Sending 0”...
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Page 14: Data Output Rs 232
Use a suitable cable to connect the weighing balance to the interface of the printer.Faultless operation requires an adequate KERN interface cable. Communication parameters (baud rate, bits and parity) of balance and printer must match.For detailed description of interface parameters see chap. -
Page 15: Verification
7 Verification Self-destroying seal mark Cover Adjustment switch 7.1 Verification validity period (current status in G) Personal scales (including chair and wheelchair scales) in 4 year hospitals Personal scales, when not located in hospitals (for example, unlimited doctor's offices and nursing homes) Baby weighing scales and mechanical birth weight scales 4 year Bed scales... -
Page 16: Adjustment
1. Carry out adjustment as closely as possible to admissible maximum load of weighing scale. Information about test weights you will find in the internet under http://www.kern-sohn.com Observe stable environmental conditions. For warm-up time required for stabilization see operating instructions corresponding to the device chap. -
Page 17: Procedure
8.1 Procedure: In weighing mode, press repeatedly until [tCH] appears. Press , [Pin] is displayed Press one after the other, [P1 SPd] will appear , „P2 CAL“ will be displayed Press Operate adjustment switch; for position see chap.16 ... -
Page 18: Maintenance
9 MAINTENANCE 9.1 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. ... -
Page 19: Determine The Problem
9.3 Determine the Problem Determine whether the problem is in the PCB or the Load Cell Disconnect the power supply from the scale, and disconnect the load cell connection from the PCB Reapply power and test the PCB ... - Page 20 Check the Battery Voltage, Voltage must be minimum 6VDC. If below the 6VDC connect the adaptor for charging the battery voltage below the 5.5VDC, replace the battery and install new 6V/3.4Ah battery. Check the Battery Charging Voltage; Remove the battery connection terminals (Red and Black) from the battery. Connect the power and turn on the scale Voltage into the terminal minimum 6.5VDC MWA_NM-SH-e-1810...
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Page 21: Trouble Shooting
9.6 Trouble Shooting Problems Possible cause Common Solutions Display is blank. Mains power is turned off. Check power is getting inside the scale and No self test Power supply faulty or not on/off switch is working. plugged. Internal battery is Verify the voltages, which is on the power not charged. -
Page 22: Parts Replacement
10 Parts Replacement 10.1 Replace load cell Turn over the platform and loosen the four feet. Loosen the screws on the load cell. Remove the BJ04board. Move the load cell line through the hole, Load cell 1and load cell 2 can be removed ... -
Page 23: Replace The Mainboard
10.2 Replace the mainboard Remove the 9 screws. Remove the battery switch , calibration switch,RS232 port line, colour cable,screws,then change the new main board MWA_NM-SH-e-1810... -
Page 24: Drawing
11 DRAWING MWA_NM-SH-e-1810...
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