Ceia THS - Page 94

THS – FI022GB2K8v3 --- V - MAINTENANCE
88
Symptom Probable cause Action
Power supply unit-
metal detector
system off
Malfunction of the power supply
section
No line voltage
Unstable or partial connections
Switch off, wait a few minutes to let any self-resetting
components inside cool down, then switch on the system
again. If the problem persists, replace card ALM
Check the power supply connections
Check insertion of the ALM card connectors
Power supply unit-
metal detector
system alternates
between on and
off
Malfunction of the power supply
section
As above
Metal detector
does not give an
alarm in the
presence of metal
masses of the
same type as the
reference sample
and of equal or
greater mass
Metal detector inhibition
Wrong detection parameters for the
current product
Product effect
SCD card malfunction
Carry out the following operations in sequence:
Set IN=0
Disconnect the ALM card connectors which do not link up to
the power supply or probe.
Select the “Default” product and check, with the sample
provided with the device, that the detector gives an alarm.
Carry out the autolearn procedure. Check the settings of the
detection parameters (SE, TP, etc.)
Carry out the autolearn procedure.
If the procedure is not successful, replace the SCD card.
Metal detector
gives false alarms
with no product in
transit
Environmental interference
SCD card malfunction
Line voltage insufficient or unstable
Carry out the “ Checking for environmental electromagnetic
interference” procedure.
Deactivate all electrical and mechanical devices surrounding
the detector, or move it into a place which is guaranteed free
of interference.
Disconnect the ALM card connectors which do not link up to
the power supply or probe.
If the interference signal remains the same, replace the SCD
card.
Check.
MDT card
motor
4
L1
L2
L3
Switch
I2
F5
F4
F3
ALM card
Voltage
regulators
Voltage
regulators
Controller
Metal
Detector
SCD card
Emergency
switch
Sensors/Actuators
L2
Switch I1
115/230V
STC card
Keyboard and signals
Forward /
backward
switching
module
MDT card
motor
4
L1
L2
L3
N
Switch
I2
F5
F4
F3
ALM card
Voltage
regulators
Voltage
regulators
Controller
Metal
Detector
SCD card
Emergency
switch
Sensors/Actuators
L2
Switch I1
115/230V
STC card
Keyboard and signals
Forward /
backward
switching
module
Fig. V-8a block diagram of the THS system with MDT card,
230V~ power supply
Fig. V-8b block diagram of the THS system with MDT card,
400V~ power supply