THS – FI022GB2K8v3 --- V - MAINTENANCE
47
Inputs
Make all connections relating to input lines using screened cable, connecting the
shielding only at the THS system end to the contacts marked with the symbol
which are provided on the various connectors.
Bar-code reader
The bar-code reader is supplied upon request: for connection, follow the indications in the plan on the previous pages.
Downstream belt authorisation (Following conveyor - Conveyor Control System only)
When active, this input indicates that the downstream belt is operating and can accept the product.
Photocell
When active, this input indicates the passage of the product in front of the photocell. The input is monitored by the self-
diagnosis system.
Ejection confirmation (Eject confirmation)
When active, this input indicates the passage of the product into the set-aside container. The input is monitored by the
self-diagnosis system.
Container full (Full bin)
When active for at least 5 seconds, this input indicates that the set-aside container is full (the malfunction relay is
activated).
Impulse encoder (Encoder)
This input is used to measure the speed of the conveyor belt if an encoder has been installed. The sensor must provide
impulses, the amplitude of which is indicated in the table “Electrical connections”, with a minimum frequency of 2 Hz and
a maximum frequency of 1kHz. It may be contact type, open collector (NPN o PNP) or push-pull. For correct operation a
coefficient KE must be determined during installation and set-up, as per the procedure described in the para. “ Transit
speed “.
Alarm reset (Reset)
When active, this input forces the Metal Detector to exit from the alarm state (used in the case of operation with belt
block and manual reset).
Inhibition
When active, this input disables the detector: it is generally used to avoid false alarms caused by the start-up of the
conveyor belt when it is not possible to adjust the mechanical structure of the belt.
Alarm inhibition when belt is switched on
If the start-up of the belt is accompanied by interference which is serious enough to cause a false alarm, the alarm can
be inhibited:
• Control Power Box
:
• connect a contact which is activated at start-up to the inhibition input;
• set the IN parameter to a suitable value determined by experiment (see “Programming” section).
• Conveyor Control System
: simply set the IN parameter to a suitable value determined by experiment (see
“Programming” section).
Air pressure sensor
When active, this input indicates that the compressed air pressure is sufficient for the ejector.
Container absent (Bin absent)
When active for at least 5 seconds, this input indicates that the set-aside container is not in its place (the malfunction
relay is activated).
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