KEENAN MechFiber 250 and
280 Operator’s Manual
62
Revision C01, 04
th
Dec 2019
12.2 Weighing troubleshooting
KEENAN troubleshooting tips on weighing
If you experience problems in the operation of the Weighing System, read through this
Troubleshooting section first before contacting KEENAN Service.
Reading drifting
If the reading on the weigh box is drifting or does not stay steady, the most likely cause of the
problem is dampness/moisture in or around the weigh box or cables. Please follow these steps
to locate and correct the problem.
•
Disconnect the cables on the weigh box. Ensure they are labelled correctly for
reconnection. Check both the plug on the cable and the connector on the weigh box
for dampness and/or corrosion of the terminals. If any dampness is found dry it off
thoroughly with a hair drier. If corrosion is found on the terminals, then clean
thoroughly with electrical cleaner & dry. Reconnect cable and test.
•
Check for loose wiring or dampness. Some machines are fitted with a junction box.
The procedure, as detailed above, applies.
•
Check Weigh cell plugs for dampness and also check Weigh cell cables for any breaks
and/or dampness.
If the above measures do not rectify the problem, then contact KEENAN Service for further
assistance.
System weighing inaccurately
If the machine is new or the weigh box has been replaced, it is possible that the weigh box may
have the incorrect calibration code for the model. Contact KEENAN service who can go through
the procedure to check (or alter) the code.
If you suspect that the system is weighing inaccurately, check all four weigh cells to make sure
that they are mounted correctly. If the bolt through the weigh cell has come loose or broken,
the weigh cell can rotate, resulting in that weigh cell giving an inaccurate reading. To check
that the system is weighing correctly, get some known weight (e.g. a bag of fertilizer) and place
it on each corner of the machine in turn. You should get the same reading for each corner. If
one corner returns a significantly different reading from the other three, then this points to a
faulty weigh cell on that corner. Also, if receiving a negative reading, it would indicate that the
Weigh cell is upside down
– rotate it 180° and repeat the test.
Weigh box will not switch ON
Check the power cable thoroughly and make certain that you are getting power from the tractor
to the display. Unscrew the power cable from the weigh box and ensure there is a good 10 to
13 volt supply across the internal pins of the cable. If the negative (-) and positive (+) are wired
the wrong way around, the weigh box will not switch on [Dinamica Generale weigh boxes power
cable - white (+) & black (-)].
