Brecknell HS-250, Инструкция пользователя

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24 HS-250 Medical Scale User Instructions
7.2 Error codes
7.3 Determine the problem
Determine whether the problem is in the PCB or the Load Cell
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Remove power from the system, and disconnect the load cell connection
from the PCB
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Connect the PCB to a load cell simulator
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Reapply power and test the PCB
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If problem goes away, its source is probably in the load cell. Check the
wiring, connecter, load cell and mechanical components of the load cell.
If problem persists, its source is probably in the PCB. Check the PCB voltages,
connectors, cables and function programs
7.4 Check the load cell
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Remove power from the system, and disconnect the PCB from the load cell
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Check for moisture or foreign material inside.
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Make sure all leads are connected correctly.
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Check load cell for proper input and output resistances
Load Cell Connections
7.5 Check PCB Voltages
If the problem is in the PCB, use a multimeter to check the following voltages
7.5.1 AC Power
Check the AC power socket out put voltage.
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Voltage must be between -20% and +10% of the normal AC voltage.
Error Code Description Possible Causes
Err 4
Zero range exceeded, due to turning
on or by pressing
Goods on the platform
Overload, when zeroing the scale
Improper calibration
Load cell problem
PCB problem
Err 6
A/D Count out of the range Platform not installed
Load cell problem
PCB problem
Measuring Points Resistance
Red (+ Exc) to White (–Exc) 420 ±20 Ω
Green (+Sig) to Black (–Sig) 350 Ω ±5 Ω