KERN MPE 250K100HNM, Руководство по обслуживанию

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MPE_HNM / MPE_PNM -SH-e-1810 21
8.4 Check the Load cell

Remove power from the system, and disconnect the PCB from the Load cell

Check the moisture, or foreign material inside.

Make sure all leads are connected and correctly.

Check load cell for proper input and output resistances
Load Cell Connections
Signal + Green
Supply + Red
Signal -
Black
Supply -
White
Shield
Measuring Points Resistance
Red (+ Exc) to White (
–Exc) 420 ±20Ω
Green (+Sig) to Black (
–Sig) 350Ω ±5Ω
8.5 Checking the different Voltages
I
f the problem is in the PCB, use a multimeter to check the following voltages
AC Power
Check the AC power socket out put 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 9VDC in to the pin AD+
Check Battery Voltage and Charging Voltage
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