TM 5-3895-374-24-2
Scale Rate - 0 At All Times
NOTE
Scale re-calibration may be required if components are replaced.
Inspect all sensor cables and connections.
1.
Verify that the scale moisture as indicated on the main operating screen is not at 100% wet.
2.
Verify the VirScale span value shown on screen 865 is a non zero value similar to the nominal value recorded for
this scale.
3.
Verify belt scale speed as shown in pulses per second on screen 865 as VirBelt xx.xx pps. Compare the reading
shown with the nominal rate recorded for this scale.
4.
If the indicated belt speed is 0 then verify that there is no apparent damage to the speed pickup, that it is securely
mounted and rotating and that its connecting cable has no visible damage.
5.
Measure the dc value of the speed pickup signal on the blend i/o card, aggregate scale terminal 3(+) to terminal
4(-).
6.
If the measured voltage is 0, replace the speed pickup unit. The belt scale calibration value may not change if the
correct replacement is properly installed.
7.
If the measured voltage is greater than 2 vdc then replace the DC Input module in line with terminals 3 and 4. The
belt scale calibration value may not change if the correct replacement is properly installed.
8.
If the measured voltage is more negative than 2 vdc, the leads from the speed pickup sensor to TB13 terminals 4
and 5 are probably reversed.
Scale Rate - Negative At AH Times
NOTE
Scale re-calibration may be required if components are replaced.
Inspect all sensor cables and connections.
1.
Measure scale input voltage on Blend I/O terminal strip, terminal 1 (+) to 2 (-).
2.
If the measured voltage is 0, go to PROCEDURE 3, Blending Control fails to respond)
page 4 - 12
