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Chapter 6: Troubleshooting
6-1 Introduction
The utmost in safety precautions should be observed at all times when working on or around
the machine and the electrical components. All normal trouble-shooting must be
accomplished with the power off, line fuses removed, and with the machine tagged as out of
service.
The use of good quality test equipment cannot be over-emphasized when troubleshooting is
indicated. Use a good ammeter that can measure at least twice the AC and DC current that
can be encountered for the machine. Be sure that the voltmeter has at least minimum
impedance of 5,000 OHMS-per-volt on AC and 20,000 OHMS-per-volt on DC scales.
Popular combination meters, VOM and VTVM can be selected to provide the necessary
functions.
Before making haphazard substitutions and repairs when defective electrical components are
malfunctioning, we recommend that you check the associated circuitry and assemblies for
other defective devices. It is common to replace the obviously damaged component without
actually locating the real cause of the trouble. Such hasty substitutions will only destroy the
new component. Refer to wiring diagrams and schematics.
Locating mechanical problems, should they occur, is relatively straightforward. When
necessary, refer to the parts catalog section.
Problem
Nothing happens when I push
"Start Blender"
"E-STOP has been Activated"
is shown
"Interface has been Locked" is
shown
I've forgotten my User
Password
POWER INTERRUPTION
ALARM
PLC Battery Low
Gravimetric Batch Blenders w/Mitsubishi Control Chapter 6: Troubleshooting
Corrective action
Check to make sure that air is hooked up and the regulator gauge
reads at precisely 60 PSI.
Check that the access door to the mixer is shut properly.
Look on the Recipe Screen. If you see "Mixer Full", then check
the mixer. If the mixer is not full, then check that the mixer prox
is adjusted properly (small screw on back).
Check the E-Stop located on the front of the blender panel.
Click "Unlock" and enter in your User Password.
Contact the Service Department.
Power was lost during a batch. Check your power source unless
you intentionally killed the power during the batch.
Change out the PLC with your spare and reprogram new unit.
Send old PLC back to Mitsubishi for repair.
71
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