4-5
Metal Detector
METARIDDER
The metal detection response
is caused by a constituent of
the material.
If frequent detection responses are observed without the presence of metal pieces, it is possible
that the machine is responding to some component contained in the material. If this was the case,
take following actions.
•
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 to the component contained in the material.
The optimum amount to be fed depends on the component of the material. Try reducing the
amount of the material little by little to find the optimum amount.
Adjust the amount of material so that the material passes closer to the center of the sensor.
* Because the sensitivity is the lowest at the center of 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 sensor has failed.
If above actions do not solve the problem, contact SAIKA.
[Table 7: Troubleshooting the problem of frequent discharge damper operation]
(*1): See Section 3.2.2 Points of Cleaning.
(*2):
Refer to “
Names and Functions of Various Sections of the Machine
” in Section 1.2.1. To ch
eck the threshold, an oscilloscope is required.
(*3): A value close to sensor signal (white noise)
Material
