4-4
Metal Detector
METARIDDER
D) The discharge damper is activated frequently or there is too much material discharged
improperly
Assumed Cause
Troubleshooting
Metal pieces have attached
inside the sensor unit.
Clean the inside (the path of the material) of the sensor unit. (*1)
Too many metal pieces are
mixed in the material.
If there are too many metal pieces mixed in the material, it is possible that most of the material
are discharged as NG material because the discharge damper always turns to the discharge
chute due to frequent detection response of the sensor. If that was the case, take following
actions.
If there are too many metal pieces mixed in the material, performing a
pre-processing of reducing metal pieces with a magnet will help increasing the
effectiveness of the machine.
•
Reduce the amount of material fed to the machine
In using the machine with the specified sensitivity, reduce the amount of material fed to the
machine to reduce the number of detection responses. The optimum amount to be loaded
depends on the level of metal pieces in the material. Try reducing the amount of the material
little by little to find the optimum amount.
Reduce the amount of material being fed to reduce the number of metal pieces passing
through the sensor.
•
Set a higher threshold (the sensitivity will drop)
Make the threshold higher than the current setting. (*2)
CAUTION
Setting a threshold higher than the recommended value may lead to a
detection performance lower than those described in the specifications.
The threshold is not set
properly.
Threshold can be arbitrarily set by user. (*2)
A recommended value for this machine has been set before shipment.
If the threshold is set considerably lower than the recommended standard value (*3), the
discharge damper frequently operates, causing a discharge error.
Material
Metal piece
