DVG IOM-ITVC-Basic-05, Инструкция по установке, настройке, эксплуатации и обслуживанию

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ITVC Series – Intelligent Total Valve Controller IOM-ITVC-Basic-05
DVG AUTOMATION S.p.A.
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SHEET 16 DI 64
9.7 Operating principle
9.7.1 Actuator control
The ITVC collects the commands from control room and HMI, the feedback sensors signals from H/PCU, Actuator
and Pipeline and
drives the Solenoid Operated Valves
of the
H/PCU
(Hydraulic or Pneumatic Control Unit)
to open
and close the process valve by means of the single or double acting actuator . Three actuator control mode are
available: LOCAL , REMOTE and OFF . On request the OFF option can be removed.
In LOCAL , the actuator can be controlled by the local pushbuttons , and of HMI. If the display is in the
Local Command page , they work as open , close and stop actuator commands (see par. Actuator Control mode).
In REMOTE , the actuator is remotely controlled by the OPEN and CLOSE digital inputs. Further digital inputs (ESD,
PST, etc.) are available to carry out special actions (safety valve positioning, command inhibit, etc.).
In OFF no command to move the actuator is available.
Both in
REMOTE
and
OFF
the local pushbuttons , , and are available to navigate in the HMI menu. In
LOCAL they are available to menu operation only in HOME page. (see par. Actuator Control mode)
The Control Logic block handles the different source of inputs, drives the outputs, monitors the operation of the
complete system “ITVC-H/PCU-Actuator” and in case of malfunction generates Alarms , MRT Alarms , and
Warnings
and carries out the configured actions. The condition of Alarm/MRT Alarm is remotely signalled by the
Monitor Relay. Four additional relay are available to signal configurable status (end of travel, warnings, etc.). ITVC
status is also locally signalled by the HMI. The minimum duration of each Local and Remote controls is 300ms
In case of “ single acting spring return” actuator, when the actuator reaches the electrical end of travel (by limit switch
or analogue position transmitter), the coil of the Solenoid Operated Valve controlling the process valve is kept
energized (or de-energized). In case of “ double acting ” actuator, when the actuator reaches the electrical end of travel
(by limit switch or analogue position transmitter), the coil of the Solenoid Operated Valve controlling the valve is kept
energized 5 sec and then it is released.
By the ADMINISTRATOR menu, in the SETUP chapter, the following control options can be set:

Local control mode:
o
Push to run
: the open and close commands is active for as long as the pushbutton or is
pressed. When the pushbutton is released the action of command ends
o Auto-maintained : by pressing the or pushbutton the command open or close is activated.
Even if the pushbutton is released the command remains active. It is reset by the pushbutton or if
the actuator reaches the end of travel.
H/PCU : Hydraulic or
Pneumatic Control Unit:
made of Solenoid
Operated Valves,
hydraulic and pneumatic
valves, filter, directional
valves, etc. to drive the
Actuator in open and
close direction.