Load Cells - Ravas iForks Service Manual

T
ROUBLESHOOTING

Load Cells

2.4-3
NOTE: Cascade recommends using Debug Mode first.
If further troubleshooting is required, follow this flow chart.
Start
Place a weight on each
of the bolts of the iFork
assemblies
The difference
between each
cell is large
YES
Dismantle the iFork assembly.
Place capscrews in the
assembly holes of the load
cells. Balance a test weight that
is 1% of their capacity of each
load cell on the capscrews.
Verify display is not creating
the problem. Replace the
touch panel and then
calibrate.
Display
NO
still shows
an error
YES
Check load cells separately.
Refer to "Testing Individual
Load Cells".
6823346-R3
NO
Load cell is not the
problem
Check iFork assembly,
refer to Section 2.4-1.
YES
Each load
cell gives the
same weight
YES Display
still shows
an error
NO
Testing Individual Load Cells –
With a load cell disconnected from the iFork system:
• Measure resistance. The resistance between
the power + (red) and signal + (green) should
be equal, within 2 ohms, of the resistance
between power - (black) and signal - (white). The
resistance between the wires and load cells should
be infinite.
OR
• To determine if one load cell is the problem,
connect each load cell to the display (using it as
a voltmeter) and compare the values shown for
each load cell. The separate values should be
close in value. If one value differs from the other
by a considerable amount, the load cell should be
replaced. Verify that the cables are not damaged.
NO
The difference
NO
is larger then 1/2
graduation
Calibrate load cells.
Refer to Service
Section 3.1.
NO
Display is
instable
YES
Check display, refer
to Section 2.4-4
Calibrate load cells.
YES
Refer to Service
Section 3.1.
With or
without a load
display show over
YES
or underload error message
and system will not
reset to zero
NO
Complete
FK0122.eps
15