Rice Lake Combination System - Precision Loads PL9710 Indicator - Manual (Page 22)

18 PL9710 Installation Manual
9.0 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.
For 2 load cells per channel
Channel 1 Red = __________ Black = __________
Channel 2 Red = __________ Black = __________
For 4, 5, or 6 load cells per channel
Channel 1 Load cell 1 = __________ Load cell 2 = __________
Load cell 3 = __________ Load cell 4 = __________
Load cell 5 = __________ Load cell 6 = __________
Channel 2 Load cell 1 = __________ Load cell 2 = __________
Load cell 3 = __________ Load cell 4 = __________
Load cell 5 = __________ Load cell 6 = __________
9.1 Recording Test Numbers
Use the following procedure to record test numbers.
1. Press the
Menu
key to get the Function menu.
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.
2. The information display will show Reset Empty weight.
3. Press the
Menu
key again to show Select Mode.
4. Press
Test
softkey 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.
5. Press the
CH-1
softkey to display the channel 1 test numbers. Record the test numbers.
6. Press the
CH-2
softkey to display the channel 2 test numbers. Record the test numbers.
7. If one of the channels has more than 2 load cells, the information display will show the test numbers for each
load cell with its corresponding number, such as Lc1.
8. Press the
Cancel
softkey to return to the normal weighing mode.
The display will briefly show CANCEL - Test Mode.