FI002K0018v1530hUK – THS/21 Instruction manual for installation, use and maintenance
3
INSTALLAZIONE
ORIGINAL
INSTRUCTION 137
3.10.3 EM = R
Generic example
S: Metal Detector Probe
N: Conveyor belt
PL: Pack length
DW: Detector width
Conveyor Control System
Waveform
Description
Signal over the alarm threshold
with transport activated
-
Conveyor belt status
Movement of the belt in the
direction indicated by the arrows
ED = Distance to be moved backward; BS = Transit speed set on BS parameter or, in presence of an encoder (KE>0),
measured; TA = Minimum activation time of the alarm relay; a = time due to the belt deceleration, at the 1 second stop
and next acceleration.
If an Alarm is still present after the belt moved backward for a space ED, the belt will move another ED space backward.
3.10.4 EM = F
Generic example
S: Metal Detector Probe
N: Conveyor belt
C: Contaminated product
DW: Detector width
ED: Ejection distance
Waveform
Description
Signal over the alarm threshold
with transport activated
Metal alarm
ALARM RELAY
External alarm signalling
EJECT RELAY
Ejection signal
YELLOW LAMP
Alarm beacon operation
ED = Ejection distance; BS = Transit speed set on BS parameter or, in presence of an encoder (KE>0), measured;
ET = Ejection relay activation time; AT = Minimum activation time of the alarm relay
t1 = Alarm time, generally corresponding to the transit of the metal mass through the Probe
ALARM RELAY and YELLOW LAMP can be programmed to stay activated, after an Alarm, until a manual reset
(parameter AT)
