FI002K0018v1530hUK – THS/21 Instruction manual for installation, use and maintenance
5
MAINTENANCE
ORIGINAL INSTRUCTION 187
5.5.3 Compatibility checks result
For each step the procedure records the peak (pk) and the average (av) value of the signal read by
the Metal Detector. In case of SUFFICIENT or INSUFFICIENT results, and based on the measured
data values, the Metal Detector can give also an indication on how to fix some of the noises detected:
-
Improve electromagnetic compatibility
: electrical noise in the installation environment.
-
Improve transport electromagnetic compatibility
: electrical noise due to the transport
system or to a machine activated during the compatibility check procedure.
-
Improve transport general compatibility
: electrical and/or mechanical noise due to the
transport system or to a machine activated during the compatibility check procedure.
At the end of the procedure, a list with maximum (pk) and average (av) values of the signal received
on each of the four steps performed, are shown. These values are expressed in relation to the alarm
threshold (i.e. pk=1 maximum value equal to the alarm threshold).
If the Metal Detector does not give any indication, the nature of the detected noise can be located
using the indicative table below. For each step, the peak value and the average value can suggest if
the noise is due to transient effects or not.
Possible causes
Steps with higher measured values
1/4 2/4 3/4 4/4
Electrical noise due to the transport (i.e. inverter and motor connection)
Generic electrical noise (due to any machine other than the one activated
during the procedure)
Generic mechanical noise (i.e. due to vibrating or moving parts in the Probe
nearby).
Mechanical noise due to the transport (i.e. uninsulated cylinders, vibrations,
belt contamination)
5.5.3.1 Corrective actions
Check that the minimum requirements and the General Notes on Installation are respected, as
indicated on the chapter Installation, and perform the proper corrective actions.
If to locate the possible noise source, or to eliminate its effects, is not possible, increase the Metal
Detector immunity to environmental noises performing one or more of the following general actions:
- Adjust the valus of
BL
and
BM
the most nearest to the range of expected operating speeds; if
this is not enough, gradually decrease of parameter
ADS
from 0 to the minimum negative
value (absolute) to guarantee a noise level compatible with the Metal Detector operative
working: in this case, successively perform a verification of the correct detection and ejection
of the Test Samples, at the minimum and maximum operating speed provided;
- Compatibly with any other adjacent Metal Detector, check the noise level in the other
transmission channels (CH) available;
- Where applicable, perform the product Autolearn disabling the automatic selection of band or
detection mode, by selecting it manually in order to eventually find the one that leads to the
best noise reduction, compatibly with the required performances;
- As last, reduce the Sensitivity (
SE
) to a value that guarantee a noise reduction and the best
detection performances.
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