15
T412 SERIES
1.
Cable 20 x AWG 20/19 Cu/Sn
2.
Section 0.55 mm²
3.
Flame retardant insulation PVC 105
4.
CEI 20.35 IEC 332.1 regulations
5.
Maximum operating temperature: 90°C
6.
Conformation: 4 sets of three twisted and coloured conductors
7.
Shield in Cu/Sn
8.
Flame retardant PVC sheath
9.
External diameter 12mm
10.
Standard conformation in 100m coils
The T series equipment boasts an innovative control function combined with the dynamic status of the
Pt100 sensor.
NOTE: only for the Pt100 sensor.
Activating FCD, the control unit analyses the increase in temperature
∆T (*) recorded in a second (
°C/sec
).
By selecting YES, the use enables the function, the set value (ΔT) is 30°C/sec.
If the value detected is higher than the value set (30°C/sec.), the control unit inhibits the possible activation of the ALARM
and TRIP alarms and switches the FAULT relay (7-8-9), displaying the message
"Fcd fault".
Setting "no" disables the FCD function.
When a channel is in FAULT for FCD, the Alarm and Trip warnings are inhibited; therefore only the quick temperature
increase is highlighted.
Press Reset to delete the FCD warnings and reset the FAULT relay.
Possible FCD applications
Identification of a possible induced disturbance on the Pt100 sensor line
If the installation instructions are not complied with (see page 13), any disturbance on the Pt100 sensor line can cause false
readings or anomalous alarms.
Corrective actions: check the installation of the sensor extension cable is in line with the instructions given in the paragraph
on the measurement signal transfer on page 13.
Identification of a sensor fault or faulty connection
In case of a faulty connection or sensor fault, a quick positive or negative variation in temperature might occur, leading
to the system tripping or the alarms of the monitored system to be triggered.
Corrective actions: check the terminals are tightened and replace the faulty sensor, if required.
Identification of the electrical motor rotor block
In case of temperature control of the electrical motors, the quick temperature increase might be due to a blocked rotor.
(*)
The ΔT value shows the temperature range for each second.
FCD FUNCTION
Pt100 EXTENSION CABLE TECHNICAL SPECIFICATIONS
