Rice Lake OB-350 Loadrunner Series Onboard Weight Indicator - Manual (Page 30)

26 OB-350 Operators Manual
8.2 Troubleshooting
8.2.1 Fusing
The OB-350 is fitted with a self-resetting thermal fuse. In the event of a fault or an electrical surge, the thermal fuse
will activate and cut power. The fuse will reactivate after a few seconds, once the fault has been removed. Trip
current is 300 mV or greater than 30 VDC.
Perform the following simple checks to determine that the system is working correctly.
1. If the readings are incorrect, but consistency is high or low, recalibrate the system.
2. If the weight values are erratic, check the power supply (9-30VDC). If the power supply is functional,
replace the indicator.
3. If the indicator is found to be defective, remove and contact RLWS service for a replacement. If the
problem has not been isolated, continue with the troubleshoot procedures.
Note
Recalibration at this stage could complicate the problem. However, once the problem has been identified and
corrected, it would be advisable to refer again to Section 7.0 for calibration details.
8.2.2 Diagnostics
The diagnostic tool displays the electronic signals coming in from load cells, sensors or CANbus enabled devices.
Values shown will vary according to tare weights, any load in the body of the vehicle and mechanical installation
integrity. Look for consistency, positive values, and pairs of cells showing similar or dissimilar readings. Typical
millivolts readings may range from 1 to 8 mV, (no load to full load).
8.2.3 Visual Checks
If no indicator defects can be found, the fault may be in the cables or load cells. A visual inspection of cables for
damage or chafing, crushing. Make sure the cables connections are secure and thumb tightened. Make sure
exposed connections are clean and dry.
8.2.4 Load Cell checks
If the display still shows an erratic reading or unusual high reading, disconnect one load cell from the junction box and note
its effect on the display. If the display shows a significant impediment, the load cell is probably at fault and will need
replacing. If no significant improvement is noticed, reconnect the load cell and repeat the procedure for the remaining load
cells.