4
T2612 UNI
TECSYSTEM S.r.l ®
7) MEASURE SIGNALS TRANSPORT
All the transport cables of the Pt100 measure signals must absolutely:
•
be divided from the power ones
•
be realized with shielded cable with twisted conductors
•
have a section of min 0.5 mm²
•
be twisted if you have no shield
•
be firmly fixed in the terminal board
•
have tinned or silvered conductors
All the “T” series units have the sensors linearization with a max error of 1% v.f.s..
8) THERMOMETRIC SENSORS DIAGNOSTIC
In the event one of the thermometric sensors installed on the machine to protect is dam-
aged, the
FAULT
relay energizes immediately, the
ALARM
and
TRIP
LED’s of the dam-
aged channel lighten and the
FAULT
LED is lightening.
The screen will automatically display a message showing the fault condition:
•
Fcc
sensor is short circuited
•
Foc
sensor is open
9) FCD FUNCTION - DEFECTIVE SENSORS
During the unit normal operation, if the
Fcd-YES
function has been selected, the display will
show
Fcd
indicating that a sensor is damaged and the LED corresponding to the affected
channel will lighten.
The
FAULT
relay will energize giving a signal to the operator.
After the replacement of the damaged sensor, you can reset the alarm pushing
RESET
until
the display shows the message
rSt
.
10) TEMPERATURES DIAGNOSTIC
When one of the thermometric sensors surveys a temperature exceeding by 1°C the alarm
limit, after 4 seconds the
ALARM
relay will energize and the
ALARM
LED of the affected
channel will switch on.
The same occurs when the
TRIP
temperature limit is detected: the
TRIP
relay energizes
and the
TRIP
LED corresponding to the affected channel is lightening.
When the surveyed temperature declines of 1°C below the prefixed limit for the
ALARM
and
TRIP
switching , the relays de-energize and the respective LED’s switch off.
TECSYSTEM srl has realised a special cable for the measure signal transport
with all the protection requirements according to CEI Norms: mod. CT-ES
