Thermo Scientific Oretronic III, Operating & Service Manual

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Operating the TMD
Thermo Fisher Scientific Operating the TMD 3-5
REC-4105 Rev L
The ENTER key is also used to clear error and fault messages (refer to
Section “Error Messages”).
The RESET key is used to reset the ALARM output after metal
detection. It also resets the coast count to zero. Pressing this key returns
the TMD to normal Run mode after an alarm.
Four LED indicators on the TMD front panel provide information about
the detector’s current operating status. Figure shows these indicators on
the front panel.
The NORMAL LED (green) indicates that the TMD is in normal Run
mode, has not determined a fault or error exists, and has not detected
metal since the RESET key was pressed. It is never on when the
ALARM LED is on.
The ALARM LED (red) indicates that metal was detected and the TMD
has not been reset since the detection. This LED will also be on if a
fault or error is present. It is never on when the NORMAL LED is on.
The BYPASS LED (yellow) indicates that the alarm output relay is
disabled by the SW2/SW3 switch settings on the CPU board (see
Section (“CPU Board Switch Settings”) or by remote bypass input.
Alarm output is also disabled (and the BYPASS LED lit) when the TMD
is in Setup/Calibrate mode (CALIB. LED lit). This allows you to set up
and calibrate the detector without generating alarms during the process.
BYPASS disables the alarm even if metal is detected and essentially
isolates the TMD from the rest of the system. The detector itself will
function normally otherwise.
The CALIB LED (red) indicates that the TMD is in Setup/Calibrate
mode. When it is lit, you can change setup variables or calibrate the
detector.
The bar graph is a vertical bank of 20 LEDs that indicates relative signal
strength from tramp metal. The more LEDs that are lit from the bottom
up, the stronger the signal. The bar graph is also used during coil
balancing.
RESET Key
Front Panel LED
Indicators
NORMAL
ALARM
BYPASS
CALIB
Bar Graph