Rice Lake Combination System - Precision Loads On-Board Weighing Systems - Manual (Page 61)

Service and Troubleshooting 57
Bad signal Ch.2
The quality of the signal from the channel 2 transmitter is poor.
• Disconnect the channel 2 wires from the back of the indicator. Assuming channel 1 is working, move the
channel 1 wires from the channel 1 terminals to the channel 1 terminals. If the error message remains, then
check the voltage at the power cable. If should be between 11.5 and 16 volts.
• If the voltage is good, then make sure the power lead is connected directly to the battery. Power from any
other source may be too “noisy”.
• If the error message still remains, then the indicator may be defective.
• If the message is gone when the channel 1 wires are substituted for channel 2, then the channel 2 transmitter
is defective or the connector may not be plugged in correctly.
LOW POWER - Input Power required 11VDC to 16VDC
The power voltage to the indicator from the battery is less than 11 volts or greater than 16 volts.
• Make sure the power cable is adequately connected at the terminal strip on the back of the indicator.
• Measure the voltage at the power cable at the back of the indicator. It should be between 11 volts and 16
volts. If not, measure the voltage where the power cable is connected to the battery. If the voltage is greater
than 16 volts, check the charging system of the truck.
• Make sure the power cable connections at the battery are clean and tight. The cable must be connected
directly to the batteries and not to an accessory, ignition, or other connection in the dash.
5.11 Test Mode
Test numbers provide a way to verify that the system’s load cells are working as they should. Since the test number
is related to the actual output of the load cell, it will also give you a warning of impending load cell failure. With a
properly working system, the test numbers for all the load cells should be similar. Load cells that are perfectly
balanced (meaning no offset) will have test numbers very close to 32,767 when the truck is unloaded. Many load
cells are not perfectly balanced, which means the test numbers will be somewhere between 25,000 and 39,000. If
you record a test number outside of the 25,000 to 39,000 range, the load cell has an abnormal offset and may be
ready to fail.
As the truck is loaded, the test numbers should increase proportionately. For example, suppose the channel 1 test
numbers were 32,546 (black) and 33,275 (red) when the truck was empty. When loaded, the test numbers should
increase and the test number for the red load cell should still be slightly larger than the black load cell test number.
If you notice one of the test numbers slowly increasing or decreasing but the load is stable, that load cell output
may be drifting and the load cell may be failing. Another sign of impending failure would be if one of the test
numbers increase much greater or less than the other for that channel.
The following steps will show you how to get test numbers for each load cell. If the system is working properly,
record the empty weight test numbers for future reference. If you change load cells, be sure to change the
appropriate test number.
5.11.1 Recording Test Numbers
Use the following procedure to record test numbers.
1. Press the Menu key to get the Function menu.
Note
If you do not continue with the operating within 15 seconds, the indicator will reset to the normal weighing
mode and you will need to start again.
The information display will show Reset Empty weight.
2. Press the Menu key again to show Select Mode.
3. Press Test key to select the test mode.
The display will briefly show Select Test Mode.
The weight display will show Test during all of the following steps.
4. Press the Ch-1 key to display the channel 1 test numbers.
Record the test numbers.
5. Press the Ch-2 key to display the channel 2 test numbers.
Record the test numbers.
6. Press the Cancel key to return to the normal weighing mode.
7. The display will briefly show CANCEL - Test Mode.