Thermo Scientific Oretronic III, Operating & Service Manual

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Maintaining & Troubleshooting
4-20 Maintaining & Troubleshooting Thermo Fisher Scientific
REC-4105 Rev L
4. When 5 LEDs are lit, record the COARSE and FINE values.
5. Scroll to the MAT CODE display and decrease the value shown in
the counter by 1. Press ENTER.
6. Balance the coils again using the procedure in Correcting Coil
Imbalance on page 4-4.
7. Scroll to the COARSE display and enter the value recorded in Step
4.
8. Scroll to the FINE display and enter the value recorded in Step 4.
9. Scroll to the COIL BAL display and observe the LED bar graph.
If fewer then 5 LEDs are lit, the TMD is functioning properly at this
material type code and the sensitivity will be greater that it was with
the previous material type code.
Note
: The lower the material type code number, the greater the
sensitivity to conductive materials other than tramp metal. In most
instances, this will not be a problem: If a problem should occur, refer
Adjusting for High Product Noise (Mineral Ores) on page 4-10.
If more than 5 LEDs are lit, the TMD may still function properly at
this material code setting.
10. Perform an auto-calibration for coarse and fine metal sensitivity as
described in Section “Initial Setup Procedure” and test the system to
see if it trips on tramp correctly.
11. If still greater sensitivity is required, repeat this procedure until you
have the sensitivity you need.
If you suspect that coil or junction box (if used) damage may be causing
the TMD to operate improperly, follow the procedures in this section to
test for damage.
These procedures involve testing wiring on the CPU board (and in the
junction box, if your system uses one) using an ohm meter.
Figure 4-1 shows the location of the terminals on the bottom left of the
CPU board.
Testing for Coil
or Junction Box
Damage