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Gravimetric Batch Blenders w/Mitsubishi Control Chapter 6: Troubleshooting 75
Problem Corrective action
I can’t calibrate the Scale
without an error message.
This Is caused by the difference in bits not being large enough.
Using the Direct Scale Readout, examine current loadcell bits with
and without the calibration weight. If the bits do not change
significantly, then check for pellets jamming the loadcells and
check the loadcell circuit. You might have a bad loadcell.
Do other feeders calibrate correctly? Is the feeder I’m trying to
calibrate a large gate? If these are true, then lower the Batch % for
Feeder Cal setting under Feed Calibration Options. This can be
observed by looking at the Hopper Weight display.
I can’t calibrate the feeder
without an error message.
None of the feeders calibrate? Check the Scale Calibration. If this
is correct, then lower the Batch% for Feeder Cal setting under Feed
Calibration Options for each feeder. This can be observed by
looking at the Hopper Weight display.
Weigh hopper does not empty
completely.
Check the dump time setting. It may be set too short.
If this does not correct the problem, clean the weigh hopper and
recheck the scale diagnostics readout. If not showing (0) zero when
empty, re-calibrate the scale.
Blender does not make rate.
Verify application is not exceeding blender capacity.
Verify additive percentage is not higher than designed, resulting in
excessive dispense time.
Verify all materials are feeding freely through the metering gates
or augers.
I have changed the recipe entry
mode, metering order, batch
size, inventory shutdown,
weigh every batch mode, or
feeder type and alarm flags, but
the change hasn’t taken place.
All of these settings are part of the current running recipe. This
makes it easy for the operator to load a stored recipe without
having to reconfigure all of these parameters for the new recipe.
All you have to do is touch “Accept New Recipe” to load these
values into the running recipe.
A feeder always puts too much
material in the batch.
Check that the Gate Cycle Time is set correctly. If it is then lower
the Initial % of Target to Meter. These are found under Feed
Algorithm Options. Make small adjustments and retest.
Increase the Gate Cycle Time. This is found under Feed
Algorithm Options. Make small adjustments and retest.
Increase the Allowed Underfeed value under Feed Algorithm
Options.
A feeder is retrying more than
2-4 times.
Decrease the Retries before Double Gate Time.
Other service problems or questions can be answered by contacting the Service Department.