DVG IOM-ITVC-Basic-05, Installation, Set-Up, Operating & Service Manual

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ITVC Series – Intelligent Total Valve Controller IOM-ITVC-Basic-05
DVG AUTOMATION S.p.A.
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SHEET 17 DI 64
 Remote control type
o Digital input : the hardwired digital signals control the actuator
o
Bus : the commands by Modbus control the actuator
o
Digital input and Bus
: digital inputs and bus can control the actuator. The Bus commands have the
priority over the digital inputs.
o Function 2-Wires : hardwired digital control by two wires

Remote control mode:
o Push to run : the open and close commands is active for as long as the input signal is present. When
the signal disappears the action of command ends
o Auto-maintained : the command open or close is activated by the signal on the digital inputs OPEN
and CLOSE. Even if the signal is removed the command remains active. When the actuator reaches
the end of travel the command is cleared. The commands can also be cleared by a digital input if
configured as “ Remote STOP ”.

Remote stop:
o
Enabled:
the remote STOP digital signal clears both remote and local open/close commands
o
Disabled
: the remote STOP digital signal clears only the remote open/close commands
9.7.2 ESD Emergency Shutdown
The ESD , E mergency S hut D own, command overrides any existing command and allows the actuator executing the
emergency action to reach the safe position . The reaction time is less than 600 ms . The configuration options, in the
ADMINISTRATOR menu, allows setting:

ESD Safety position: close, open, inhibit all (stay in position)
 ESD control signal polarity: ESD active when the signal is present (active HIGH or ETT : E nergize- T o- T rip)
or absent (active LOW or DETT : D e- E nergize- T o- T rip)

ESD command type: push to run or self-maintained
 ESD command mode: active only in REMOTE or both in LOCAL and REMOTE control mode

ESD latch: hold the ESD action until the signal is present or until a manual RESET , available in
ADMINISTRATOR menu of HMI, is entered.
 ESD both active: two options are available:
inactive ( 1oo2 )
and
active ( 2oo2 )
ESD signalling: While ITVC performs an ESD shutdown, it raises an alarm. This is signalled remotely, by the switch-
over of monitor relay, and locally, by the LED red colour and the icon in the Home page of display. In the
detailed alarm list appear:
Performing ESD
,
Microprocessor 2 alarm
and
Safety action
.
ESD Redundancy:
The ITVC has 2 independent, separated, ESD1 and ESD2, input channels and carries out the emergency action
according to the configuration options described below:
 Active and signal polarity HIGH : ESD starts if the signal is HIGH in both inputs
 Active and signal polarity LOW : ESD starts if the signal is LOW in both inputs

Active , any signal polarity: if the signals are different, a warning appears, no action is done, the LED
is colour fuchsia and icon is in the
HOME
display
 Inactive and signal polarity HIGH : ESD starts if signal is HIGH at least in one input

Inactive and signal polarity LOW : ESD starts if signal is LOW at least in one input
ESD is one of the ITVC safety functions (the other ones are Panic Button and Line Break). The Diagnostics function of
the digital inputs can detect short circuit and open circuits in the ESD1/2 input channels. If the above failures occur in
2oo2 mode, the ITVC raises an “ MRT timer” alarm (Fault opto ESD1 or ESD2) and switches to 1oo2 operation. When
the MRT time expires and if the alarm is still present, the ITVC performs the safe action. If the above failures occur in
1oo2 mode, the ITVC raises an alarm and performs the safe action. See “Alarm, MRT alarm and Warning”,
“Visualization of Alarms and Warnings” and “Instantaneous measures sub-menu, MRT” paragraphs.
If one only input channel is used it is mandatory to put a jumper between the terminals ESD1 and ESD2 .
ETT:
in the
E
nergize-
T
o-
T
rip applications the optional battery must be present.
.
A