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Related Manuals for KERN MWN-M
Summary of Contents for KERN MWN-M
- Page 1 KERN & Sohn GmbH Ziegelei 1 Tel: +49-[0]7433- 9933-0 D-72336 Balingen Fax: +49-[0]7433-9933- E-Mail: info@kern- sohn.com Internet: www.kern- sohn.com Service Manual Medical Wheelchair scale KERN MWN-M Type TMWN 300K-1M-A Version 2.0 06/2022 MWN-M-SH-e-2220...
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Page 2: Table Of Contents
KERN MWN-M Version 1.0 – 05/2022 Servicemanual Table of contents Basic Information................... 3 Introduction ....................3 Appliance overview ..................4 Feature overview ........................5 Keyboard overview ........................6 Installing the wheelchair scales ....................7 Mains connection ........................8 Safety cable ..........................8 Rechargeable battery operation with an optional battery power pack ........ -
Page 3: Basic Information
2 Introduction This service manual covers the MWN wheelchair scale 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. MWN-M-SH-e-2220... -
Page 4: Appliance Overview
3 Appliance overview 1. Adjustment switch 2. Terminal power supply unit 3. Connection cable "Display - Platform" 4. Battery compartment 5. KUP interface (Kern Universal Port) MWN-M-SH-e-2220... -
Page 5: Feature Overview
• Setup menu • Service menu • Kern Communication Protocol (KCP) • Kern Universal Port (KUP) interface, VGA-15 female connector • Built-in WiFi interface • Optional internal Memory / Real Time Clock module • Optional external RS-232 interface through KUP •... -
Page 6: Keyboard Overview
Function key Function quick key Quick call-up of a function stored before Weighing scale will be reset to „0.0“ Zeroing key In menu: • Confirm selection For numeric entry: • Change decimal digit • Confirm entry TARE key Tare balance MWN-M-SH-e-2220... -
Page 7: Installing The Wheelchair Scales
Check if the air bubble of the level is within the prescribed circle. If the air bubble of the bubble level is not in the required circle, level the balance using the adjustment feet as specified. Check levelling regularly. MWN-M-SH-e-2220... -
Page 8: Mains Connection
Power is supplied via the external mains adapter. The specified voltage must correspond to the local voltage. Only approved genuine KERN power supply units may be used in compliance with Directive EN 60601-1. The small sticker attached to the side of the display unit indicates the power port. -
Page 9: Rechargeable Battery Operation With An Optional Battery Power Pack
(charging time 12 h for a complete charging). • 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. MWN-M-SH-e-2220... -
Page 10: Battery Operation
„Lo bAt“ is displayed on the the batteries are exhausted, the symbol balance; replace the batteries. To save the battery, the balance switches automatically off. Capacity of batteries exhausted. Lo bAt Capacity of batteries will soon be exhausted. Batteries completely charged MWN-M-SH-e-2220... -
Page 11: Insert Batteries
Remove the battery holder (2) Insert the batteries into the battery holder Insert batteries with the battery holder into the battery compartment and lock it with battery compartment cover. Insert batteries in the battery container and lock them with battery compartment cover. MWN-M-SH-e-2220... -
Page 12: Initial Commissioning
(mains, accumulator or battery) and be switched on. The accuracy of the balance depends on the local acceleration of gravity. The value of gravity acceleration is shown on the type plate. MWN-M-SH-e-2220... -
Page 13: Calibration And Sealing Information
The weighing result of the balance is outside the error limit. Therefore, • in regular intervals load balance with known test weight (ca. 1/3 of the max. load) and compare with displayed value. The reverification deadline has been exceeded. • MWN-M-SH-e-2220... -
Page 14: Position Adjustment Switch And Seals
Rehab clinics and health authorities are treated as hospitals. (4 years of verification validity) Not treated as hospitals (verification validity not limited) are dialysis stations, nursing homes and doctor’s surgeries. (Details derived from: „Information by the verification authority, weighing scales applied in medical use“) MWN-M-SH-e-2220... -
Page 15: Service Menu
1st id ID of starting memory init Initialize memory record number of records in memory info information querry SERIAL Serial number Software version B 1.2.16 vera Software version approved a 1.0.0 advalu show A/D value reset reset reset all MWN-M-SH-e-2220... -
Page 16: Software Identification
Carry out adjustment as closely as possible to admissible maximum load of weighing scale. Information about test weights can be retrieved on the KERN website (http://www.kern-sohn.com). • Observe stable environmental conditions. For warm-up time required for stabilisation MWN-M Instruction manual. -
Page 17: Adjustment Procedure
• In case the scale will be used at different location, set the gravity of adjustment location and gravity of use location. Follow the paths below in the Service Menu: Service Menu ➔ Adjust➔ CAL➔ GRAADJ Service Menu ➔ Adjust➔ CAL➔ GRAUse MWN-M-SH-e-2220... -
Page 18: Maintenance
6 Maintenance 6.1 Service, maintenance The appliance may only be opened by trained service technicians who are authorized by KERN. Disconnect the scales before opening. 6.2 Error Codes Error message Explanation zerohi Zero too high at power up zerolo Zero too low at power up... -
Page 19: Check The Load Cell
Check the AC power socket output voltage. Adaptor Voltage Check the adaptor output cable connecter voltage Compare the value with the name plate on the scale PCB Input Voltage Check the PCB input power connecter voltage Voltage must be minimum 6VDC into the pin AD+ MWN-M-SH-e-2220... -
Page 20: Trouble Shooting
If cannot reach full capacity, check weighing platform, overload stopper, load cell. ↓ Buttons functioning? If some buttons not working, check connection wires. Replace keyboard if needed. ↓ Interface functioning? If interface not working, check the connection wires. ↓ Normal operation. MWN-M-SH-e-2220... -
Page 21: Exchange Of Components
To open / close the device, break the seal, and unscrew / screw in the 4 tap. screws, M4x16, on the bottom housing. Note: Open the housing of the KMH gently to avoid damaging the connection between main board and back display board. MWN-M-SH-e-2220... -
Page 22: Exchange Of Components
5. Fix the main board with the 6 screws 6. Connect the main board as per the Wiring Diagram 7. Install the 4 screws to close the device 8. Perform Linearization and Adjustment 9. Seal the indicator 2.51.01.16850100 Main board TKMH 2.51.03.16850100 Main board TKMG MWN-M-SH-e-2220... -
Page 23: Technical Drawings
8 Technical drawings 8.1 Exploded view wheelchair platform construction MWN-M-SH-e-2220... -
Page 24: Exploded View Indicator
8.2 Exploded view indicator MWN-M-SH-e-2220... - Page 25 34 4.37.06.1685000 BATTERY DOOR 35 5.50.52.16850000 36 5.51.01.16820300 ON/OFF PCBA 37 5.51.01.16850000 PCBA01 38 5.51.02.16850000 LCD DISPLAY ASM 1 39 5.85.03.03010000 ZEBRA Rubber 40 5.87.40.06267201 LCD DISPLAY 104x45x2.8mm 41 5.94.23.01510601 BATTERY SUPPER HEAVY DUTY AA 42 6.01.45.16850000 OVERLAY01 MWN-M-SH-e-2220...
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Page 26: Tkmg/Tkmh Wiring Diagram
8.3 TKMG/TKMH Wiring Diagram MWN-M-SH-e-2220... -
Page 27: Tkmg/Tkmh Functional Block Diagram
8.4 TKMG/TKMH Functional Block Diagram MWN-M-SH-e-2220... -
Page 28: Tkmg/Tkmh Schematic Diagram
8.5 TKMG/TKMH Schematic Diagram MWN-M-SH-e-2220... - Page 29 MWN-M-SH-e-2220...
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