Rice Lake Combination System - Precision Loads PL9700 Indicator - Manual (Page 16)

12 PL9700 Installation Manual
6.0 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.
I f y o u n o t i c e o n e o f t h e t e s t n u m b e r s s l o w l y
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.
Channel 1 Red = __________ Black = __________
Channel 2 Red = __________ Black = __________
6.1 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 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.
4. Press the CH-1 softkey to display the channel
1 test numbers.
5. Record the test numbers.
6. Press the CH-2 softkey to display the channel
2 test numbers.
7. Record the test numbers.
8. Press the Cancel softkey to return to the
normal weighing mode.
The display will briefly show CANCEL - Test
Mode.