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 18 DI 64
9.7.3 Optional Panic Button
On demand, the ITVC can be equipped with an emergency P anic B utton ( PB ) (push or pull operation can be set and the
procedure is described in the paragraph Administrator menu, SETUP chapter). When engaged, ITVC drives the valve-
actuator to its predetermined
safe position
. The reaction time is less than
600ms
. The PB action is set by the parameter
“
ESD safety position
”. The PB action can be momentary or latched. In case of “latched”, the PB action can be reset by
a local command or by any local and remote command, according to the configuration of parameters “Op after PB
action” and “Panic Button mode” in the Administration menu, SETUP chapter. PB is one of the ITVC safety functions
(the other ones are ESD Emergency Shutdown and Line Break). The
Diagnostics
function of the digital input detects
short circuit and open circuit on the PB input channels. If the above failures occur the ITVC drives the actuator in safe
position. Option ETT (Energize-To-Trip) or DETT (De-Energize-To-Trip) are available. In case of ETT applications
the optional battery must be present.
9.7.4 Failsafe function
The
Failsafe
function allows the actuator performing the configured action when a
Failsafe condition
occurs. The
Failsafe action overrides any existing commands and works like an internally generated ESD command. It is activated
by the ITVC Diagnostics function and its action is set by the parameter “ ESD safety position ”. The procedure to set
the “ESD safety position” is described in the paragraph ADMINISTRATOR menu (ESD shutdown), SETUP chapter.
9.7.5 Output signalling relays
The following output contacts of relays are available to signal the status of the system “ITVC-H/PCU-Actuator” to the
user
 1 Monitor relay, single side stable, voltage free SPDT contacts: it summarizes the status of
Alarm
and
MRT
Alarm .

4 relays, configurable, latched, voltage free SPST contacts (R1, R2, R3, and R4). The action of contac t and
the condition to switch are configurable. The procedure to set the relays is described in the paragraph
ADMINISTRATOR
menu in the SETUP chapter.
Action of contact: the option “ make” and “ break ” closes and opens the contact when the condition to trip occurs
Condition to trip : the table of configurable conditions to switch the R1, R2, R3, R4 relays is shown in the paragraph
ADMINISTRATOR menu, in the SETUP chapter.
9.7.6 Configurable Remote controls
The ITVC has 4 configurable digital inputs, IN1, IN2, IN3, and IN4, available on the user terminal block. Each input
can be individually associated to a control signal coming from control room. The configuration procedure is described
in the ADMINISTRATOR menu, Digital Inputs paragraph, SETUP chapter. The following options are available.
o No set : not used
o Interlock open : input to inhibit the open command
o
Interlock close : input to inhibit the close command
o
PST command
: input of PST command
o Remote STOP : input of STOP command
o LB action : remote command to inhibit the Line Break action once a pressure event has been detected (only if
the Valve Control is enabled). Line Break alarm is cleared.
o
Pressure switch
: input available for an optional pressure switch or any digital signal. The signal can be
repeated on the output relays (R1,…, R4). No ITVC function is associated to the input
o Aut-Man : automatic / manual
o Open command : additional open command, it work in parallel with the OPEN digital input
o
Close command : additional close commnad, it work in parallel with the CLOSE digital input