Trouble shooting
D3936-GB Rev C EZ3400VL User' s manual
29
CONTINUED
Disconnect all wires of the load cell cables
from the terminals in the J-Box;
Leave the weighing indicator switched on
while disconnecting and reconnecting the
wires. It will not damage the load cells and
weighing indicator if wires are shorted during
this step. Is the value displayed on the
weighing indicator stable?
YES
NO
Zero balance the weighing indicator.
(press and hold ZERO for 3 seconds).
The value 0 appears on the display of the
weighing indicator.
Note: Connect the load cells to the J-Box one at the time;
only one load cell connected at a time.
This will get a reading for each load cell. While performing this test,
watch for any other symptoms such as erratic/unstable readout,
flashing of [
±
RANGE
] on the display, negative value, etc.
If the readout appears abnormal with any load cell connected, this
load cell is probably bad.
Replace the J-Box;
Be aware of electrical interference that might
affect the weighing indicator, such as mobile
phones, CB radios, radio towers, electrical
motors etc.
Reconnect one load cell to the terminals in the
J-Box; the displayed value of each load cell depends on the type of
load cell and the weight over the load cell.
Usually this value should be positive and stable.
Note the value displayed on the weighing
indicator with the load cell connected.
Zero balance the weighing indicator and stand
or hang with your weight over the connected
load cell. Note the weight increase;
A weighing indicator with only one connected
load cell will give a too high readout.
Note: If the weighing indicator responded to your weight, the J-Box is
OK. If the weighing indicator did not respond, either the load cell or
the J-Box is bad. Try the other load cells.
If the weighing indicator still shows no response, the J-Box is bad.
Replace the J-Box.
Repeat previous steps for the other load cells.
Remember to note all readouts of these load
cells.
Disconnect the first load cell and zero balance the weighing indicator.
Connect the second load cell. Note the displayed value.
Zero balance the weighing indicator and stand or hang your weight
over the connected load cell. Note the weight increase.
If you hang your weight over a connected load cell after zero
balancing the weighing indicator, the displayed value is probably three
or four times your weight. The readout values of your weight over
each load cell should be similar.
Bad load cells give an unstable readout, [
±
RANGE
] flashes on the
display or the displayed value is lower or higher than three times the
average of the other load cells.
Any difference could be an indication of a bad load cell
or a structural problem.
Do not expect that all load cells
give the same readout at the moment you
connect them. Usually load cells give readout
values that vary by hundreds, even
thousands. Especially when there is more
weight on one load cell.
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