Ramsey Oretronic IV Tramp Metal Detector REC 4479C
Page 47
moving the frame does not help balance, proceed to section titled
“Finding the Source of
Mechanical or Electrical Noise”.
For a single coil TMD IV:
•
Loosen the plastic bolts that hold the coil to the frame.
•
Move the coil from side to side. The slots in the coil will limit the travel.
•
As the coil is moved, the bar graph will change. Find the position where the minimum number
of bars is displayed. Retighten the plastic bolts.
•
If the previous operation improved the balance significantly, proceed to Step 8 in order to fine
tune the coil balance.
•
If adjusting the coil did not affect the balance significantly, proceed to the section titled
“Finding the Source of Mechanical or Electrical
Noise.
8.
Navigate to the Coarse Sensitivity screen and manually set the value to 5. This increases the sensitivity
of the TMD IV so you can fine-tune the coil balance.
9.
Navigate back to the Coil Balance screen and observe the bar graph again. The bar graph may be
“noisier“
than it was in Step 6. This is because the sensitivity is set higher.
10.
Repeat Steps 7 and 8, increasing the coarse sensitivity value each time.
11.
When you are satisfied with the coil balance, navigate to the Coarse Sensitivity screen and manually
set the value back to the number recorded in Step 5.
Finding the Source of Mechanical or Electrical Noise
False tripping often occurs from mechanical vibrations that produce background noise. The TMD IV software
has signal processing to recognize the difference between a signal from metal passing through the coils and a
signal from metal vibrating in the region of the coils. However, severe metal vibrations can sometimes produce
the same signal as the metal passing through the coils.
Electrical disturbances from the conveyor belt motor or the wiring from the motor may also produce noise that
interferes with TMD IV operations. Even other electrical systems near the TMD IV may be generating the noise.
Follow this procedure to find the source of mechanical or electrical noise.
1.
Balance the coils as evenly as possible using the procedure from the section
titled “Co
rrecting Coil
Imbalance”.
2.
Navigate to the fine sensitivity screen and write down the “As found” value, then manually set the
value to 950.
