JF FCT King Size 1260, Directions For Use Manual

Page: 67 / 114

5. METAL DETECTOR (MD)
PIGB-206X-02 FCT1460 0614
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The accuracy that the detector registers the metal is approx. 95 %. However, there
are several factors which influence the accuracy of the sensor: They are:

The size of the metal object.

The shape of the metal object.

The position of the metal in the feed intake section.

The cutting length and thus the feed intake speed.

The distance between the pawl and the ratchet wheel in the stop system.
REGISTRATION OF METAL
When a ferrous metal piece passes the magnet tub a voltage is induced which is
immediately registered by the microprocessor in the control unit which releases a
programmed stop sequence.
STOP OF THE FEED INTAKE SECTION
Fig. 5-3 When the metal has been detected, a signal will be sent so that the voltage on the
magnet coil
C is disconnected. Hereby the pawl A is activated and is engaged with
the ratchet wheel B which blocks the feed intake and releases the clutch D . At the
same time the reverse function goes to neutral position.
Since the feed intake is blocked faster than the reverse function goes to neutral, the
clutch
D is released briefly. It slips until the reverse has disengaged the belt
transmission.
The reverse slackens the V-belts and the drive of the feed intake is deactivated.
This means that the feed intake automatically goes into neutral in case of metal
detection, even though the switch on the control box is in feed intake position.
Of course, the system can only work if there is constant oil flow to the machine and
the control unit is turned on.
This neutral position is necessary at any disengagement as the friction clutch would
otherwise be damaged and would have to be replaced.
WARNING: Do not approach the machine when the feed intake is in neutral
position and the rotor is rotating. Neutral position does not
guarantee that the feed intake will not start.
Fig. 5-3
P
R
1
1
-1
8
2
1
B
A C
D