Metal Detector - Operation

The metal detector will trip when the sensor signal is higher than the sum of the initial threshold (set by operator) and the average of sensor signal during normal operation (manual threshold).

When the metal detector trips, the buzzer comes on, and an indicator light (G) indicates the position of the piece of metal - seen in direction of travel.

A-Metal Detector Enable Switch - (To switch from sensor signal display to average value in diagnostic mode)
B-Metal Detector Initial Threshold Switch - (Diagnostic Mode)
C-Metal Detector Calibration Switch - (Emergency Mode)
D-Metal Detector Test Switch - (Self Test Mode)
E-Indicator Light - Operating Mode, Tripped Mode
F-Indicator Light - Self Calibration Mode (Emergency Mode)
G-Indicator Light - (Indicates approximate position of where metal has been found)

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Daily before harvesting and after any repair on metal detector components perform a metal detector self test on forage harvester.

Requirements:

• Main clutch on
• Feed rolls engaged forward

After pressing the metal detector test switch (A) the sensor, the wiring harness to metal detector control unit and the metal detector control unit are tested and at end of test the metal detector trips the locking pawl.

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Requirements:

• Main clutch on
• Feed rolls engaged forward
• Crop feeding

After pressing the metal detector calibration switch (A) the performance monitor is activated for metal detector information.

• Bar graph (B) shows the sensor signal
• Left arrow (C) shows the tripping point (it is moving slightly according to sensor signal)
• The right hand side of the display digital line (D) shows the inital threshold (set by operator) for 3 seconds followed by the highest sensor signal (displayed on the left hand side of the display digital line)

In this mode the initial threshold can be set according to the displayed sensor signal, using the input control knob.

If false tripping occurs during operation, set the initial threshold about 1000 mV higher than the highest displayed sensor signal.

Pressing the metal detector calibration switch (A) again, the performance monitor will exit the metal detector mode and the new initial threshold is temporarily stored until ignition key is switched off.

Press the enter switch to store the new initial threshold permanently. Store will be displayed in the display digital line (D).

A-Metal Detector Calibration Switch
B-Bar Graph
C-Left Arrow
D-Display Digital Line

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Requirements:

• Main clutch on
• Feed rolls engaged forward
• Crop feeding

After pressing the self calibration switch the metal detector control unit will record the highest sensor signal during a period of 15 seconds of operation. The recorded highest sensor signal will be added to the inital threshold. The tripping point in self calibration mode (emergency mode) results from the sum of these two values. During recording of the sensor signal both LEDs (B) will flash (15 seconds) and will stay on during further operation in this mode.

NOTE: This mode should be considered as an emergency mode, if false tripping cannot be eliminated by setting threshold in diagnostic mode. This might be necessary to finish a day of operation with a damaged feed roll or damaged bearing.

In this mode the metal detector sensitivity will be reduced, but will still protect the machine. However, the forage harvester should be repaired as soon as possible. The metal detector will return to standard mode as soon as the ignition key is switched off.

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