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T154 WS
The T series equipment boasts an innovative control function combined with the dynamic status of the Pt100 sensor.
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 (ΔT) from a minimum of 1°C/sec up to a maximum of 30°C/sec.
If the
measured value is higher than the value set by t
he user, the control unit inhibits any activation of the ALARM and TRIP
alarms and activates the switching of the FAULT relay (11-12), signalling on the display
"fault for Fcd".
e.g. setting the function to 5°C, the fault switching for FCD will only be activated if the control unit detects an increase
ΔT
higher than 5°C in one second on the monitored system.
Setting "no" the FCD function is disabled.
When a channel is in Fault for FCD, the relative alarm and trip signals are inhibited on the single channel; therefore only
the anomaly of excessively rapid increase of the temperature is signalled.
Press Reset to cancel the FCD signals of all the channels and reset the relay fault.
Possible applications of FCD
Identification of a possible induced interference on the Pt100 sensor line
If the installation instructions are not complied with (see page 15), any interference on the Pt100 sensor line can 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 measurement signal transfer 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.
Corrective actions: check the terminals the sensor is connected to 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.
In this specific case, it is advisable to set the FCD function in a temperature range of between 20°C and 30°C
.
This setting
is recommended in order to avoid activation of the FCD function during the motor starting phase, i.e. where the increase
ΔT/sec.
has a very rapid variation.
(*)
The ΔT value shows the temperature range for each second.
NOTE: it is advisable not to enable the FCD function with VOTING active.
FCD FUNCTION
T154 WS WI-FI CONNECTION
The T154 WS control unit has a built-in
WEB SERVER
that is accessible via Wi-Fi connection.
What is needed to access the
T154 WS
control unit?
To access the web server a device with a Wi-Fi connection and an Internet browser is needed.
How to connect on the first start? “
Access Point”
mode
Power the control unit by keeping the button on the back pressed
for approximately 5 seconds.
NOTE: Access point key
The access point key allows the user to temporarily access the web server in the
"
Access Point
" mode, forcing operation with the IP address 192.168.8.8.
How it works:
With the control unit off, keep the access point button pressed, then power the
device and release the button after approximately 5 seconds
