ITVC Series – Intelligent Total Valve Controller IOM-ITVC-LB-04
DVG AUTOMATION S.p.A.
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3.6 Local signalling
In “Acquisition” and “Monitor” operating modes, the HOME page of the display shows the icon .
In “Acquisition + Valve Control” mode and Disable = , the HOME page of the display shows the icon .
In “Acquisition + Valve Control” mode and Enable = , the HOME page of the display shows the icon . If Valve
Control is performed, the ITVC signals Alarm by the red LED of the pushbutton , and the display of the HOME
page shows the icon . The Alarm page shows the message
“High press limit or Low press limit or Press drop”, “Linebreak action”, Safety action LB, and Micro 2 alarm
(see the paragraph Visualization of Alarms and Warnings in the document IOM-ITVC-Basic).
In “Acquisition” and in “Acquisition + Valve Control” modes, the conditions “Pressure increase and decrease / hour >
Max pressure increase/decrease” are signalled by Warning. The LED of the pushbutton is on, fuchsia colour, and
the display shows the icon . The Warning page of the display shows the message “Max pressure increase” or “Max
pressure decrease”. In Monitor operating mode the measured “Max pressure increase and decrease / hour” can be
viewed. The clear option in the above page resets the displayed values.
The option “Line Break Events” in the Measurement menu shows the list of the “Pressure events” with date and
time and the 24 hours graphs.
The option “Line Break Warnings” in the Measurement menu shows the list of the warnings with date and time. No
graph is available.
3.7 Analogue inputs architecture
The option “Sensor” in the Line Break menu page allows setting the architecture
of the analogue inputs connected to the pipeline pressure transmitters .
3 modes are available: 1oo1, 1oo2, 2oo3 and 1oo3.
1oo1 mode: one only pressure transmitter, only Sensor 1 or 2 or 3 = = ON,
no voting mechanism, one only analogue input channel
1oo2 mode: two pressure transmitters, Sensor 1-2 or 1-3 or 2-3 = = ON,
voting mechanism, two analogue input channels
2oo3 mode: three pressure transmitters, Sensor 1-2-3 = = ON,
voting mechanism, three analogue input channels
1oo3 mode: three pressure transmitters, Sensor 1-2-3 = = ON,
voting mechanism, three analogue input channels,
“1oo3 operating mode” = = ON
The analogue input channels should be previously enabled/disabled by the
Setup, Administrator, Analog inputs menu (see document IOM-ITVC-Basic).
The next paragraph “Diagnostics” describes the behaviour in case of failure.
3.8 Output to drive the SOV
According to the user request, the ITVC can be configured to control one or two SOV’s. ITVC functions include the
test of electrical continuity and absence of short-circuit of coil of SOV’s. It is described in the IOM-ITVC-Basic,
paragraph “Test of coil of Solenoid Operated Valves” and in the procedures “Coil test” and “Test coil absorption”,
Setup chapter, Administrator menu. Any fault must be detected three consecutive times, before confirmation.
3.9 CPU redundancy
Line Break and emergency safety functions are managed by two independent CPU’s working in parallel, in particular
they manage input reading, logic processing and output enabling.
LB
page
LB sensor
= ON
= OFF
