Ramsey Oretronic IV Tramp Metal Detector REC 4479C
Page 49
WARNING.
The coil wiring must be run in a separate conduit from any power wiring.
If the system appears to be installed and wired correctly and there is still a high level of noise when the
conveyor is run, other electrical systems may be generating the noise.
8.
With the conveyor running empty, turn off other systems near the TMD IV one at a time while
observing the bar graph. Turning off the source of the electrical noise will cause the number of bars to
decrease, identifying that system as the one causing the problem.
9.
If you identify a definite source of the electrical noise, correct the problem.
A typical solution may be re-routing wiring carrying large currents. In some instances, the only practical
solution may be relocating the TMD IV to some other less noisy location. If you cannot identify a
definite source of the electrical noise, it may be helpful to change the operating frequency of the TMD
IV.
10.
Navigate to the Settings menu, and change the operating frequency to the other value (A or B).
11.
Observe the bar graph on the Home screen. If the number of bars has decreased, this is a better
operating frequency for the TMD IV. If the number of bars has not decreased, set the operating
frequency back to the original value and continue on.
Adjusting for High Product Noise (Mineral Ores)
With some highly conductive ores, the default measurement window for detecting metal will cause false
tripping similar to high electrical noise when the ore is conveyed. The typical indication of this situation is a low
noise level when the conveyor is run empty and a higher level when it is run loaded (as indicated by the bar
graph).
This noise signal can be overcome by changing the location of the measurement window, which determines
the timing of the measurement. Because the magnetic field from mineral ore takes longer to decay, you need
to move the measurement window farther out on the time scale so the instrument will not be as sensitive to
the signal from the ore. To move the measurement window farther out on the time scale, you increase the
material type code number.
Follow this procedure to adjust the sensitivity of the TMD IV for mineral ores
1.
Balance the coils as evenly as possible using the procedure fr
om “Correcting Coil Imbalance”.
Make
sure that the Material code (in the Settings screen) is set to 4.
2.
Navigate to the Coarse Sensitivity screen and perform an auto-
calibration (“Learn”).
