19
NT210 K
NOTES ON THE FCD FUNCTION
The NT series equipment boasts an innovative control function combined with the dynamic status of the Pt100 sensor
inside the TPL503.
Activating FCD, the control unit analyses the increase in temperature ∆T (*) recorded in a second (
°C/sec
).
Enabling the function, the user can select the value (∆T) from a minimum of 1°C/sec (2°F) to a maximum of 30°C/ sec.
(54°F). If the value sensed is higher than the value set by the user, 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".
Example: if we set the function to 5°C, FAULT for FCD will switch only if the control unit senses an increase in ∆T of
over 5°C in a second on the monitored system.
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 on all channels and reset the FAULT relay.
Possible FCD applications
Identification of a possible induced disturbance on the sensor line
If the installation instructions are not complied with (see TPL503 connections on page 15), any disturbance on the Pt100
sensor line may cause false readings or anomalous alarms.
Setting the FCD function in a temperature range of between 1°C and 10°C (5°C recommended), the effects caused by
false readings can be suppressed and the alarm relay activation can be prevented, as shown above.
Corrective actions: check the installation of the sensor extension cable is in line with the instructions given in the
paragraph on the TPL503 connections on page 15.
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.
In this specific case we recommend the FCD function to be set in a temperature range of between 10°C and 20°C.
(*)
The ΔT value shows the temperature range for each second.
NOTES ON THE FPS FUNCTION
Activating the FPS function it is possible to monitor quick increases in pressure.
If the pressure exceeds the set value in a second, the FAULT relay switches and FPS is displayed on the pressure
channel.
This increase can be set in steps of 10 mbar up to a maximum of 200 mbar.
Sensitivity is controlled by the value set, setting "no" disables the FPS function. Excessively low values might cause
warnings too often, while excessively high values would do the opposite.
In case of FPS, the relative Alarm and Trip thresholds are always monitored. Press Reset to delete the FPS warnings
and reset the FAULT relay.
ATTENTION:
We recommend you check the control unit before starting the device.
The default parameters set by TECSYSTEM might not suit your requirements.
Programming the device is the end user’s responsibility: the set alarm thresholds and the
enabled functions described in this manual must be checked (by a specialized technician)
referring them to the application and system characteristics on which the control unit is
installed.
