ITVC Series – Intelligent Total Valve Controller IOM-ITVC-Basic-05
DVG AUTOMATION S.p.A.
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SHEET 21 DI 64
9.7.13 Test of coils of Solenoid Operated Valves
This function allows setting the type of test of Solenoid Operated Valve coils. Two options are available: Automatic and
Manual. In Automatic the test is performed every 8 hours, in Manual the test is performed immediately, by executing
the procedure “
Coil test
” in the ADMINISTRATOR menu of SETUP chapter. The test compares the current of each
coil with the values measured with the procedure “
Test coil absorption
” in the ADMINISTRATOR menu. If the
comparison is OK the test is passed. If the test fails, the ITVC raises an Alarm that can be viewed in the Alarm list.
9.7.14 Measure of closing time
At the end of every valve closure, the closing time is compared with the reference “closing time” set by DVG
Automation. If the comparison fails the ITVC raises an Alarm. The user can measure the closing time by the procedure
described in the paragraph “Stroking time test”, SETUP menu (it can be useful in the start-up phase to calibrate the
pneumatic or hydraulic adjustable flow control valves).
9.7.15 Date and time
The function Date and Time is used to set the present date and time of ITVC. The function can be set by the sub-menu
with icon of the SETUP menu . No password is requested to set it.
9.7.16 Digital input repetition
This function is used to retransmit the status of one digital input (chosen between IN1,…, IN4) by an output relay
(chosen between R1,…, R4). See paragraphs “Configurable Remote controls” and “Output signalling relays”. The
configuration option to use is:
Digital input = Pressure switch
Output relay = Pressure switch
The setting procedures are described in the paragraphs “Digital inputs” and “Output relays” of the Administrator menu,
SETUP chapter.
9.7.17 CPU’s and Diagnostics
Safety functions
(Emergency Shutdown, Panic Button and Line Break) are managed by two independent CPU’s working in parallel.
They manage input reading, logic processing, output enabling and fault detection and reaction
Logic block
and
Output block
are realised in
1oo2
redundant architecture
CPU Diagnostic
:
Diagnostics processed by each CPU includes: Comparison between the two CPUs, Software
flow diagnostics, Watchdog, System clock monitor etc. In case of fault an MRT alarm is generated. In case of
faults not imputable to an identified channel, like Power supply, Temperature, etc., the system switches to
failsafe state.
Digital input Diagnostics:
See Emergency Shutdown and Panic Button paragraphs
Analogue input diagnostics:
See Annex B: Line break function
21-12-2012
Summary of Contents for IOM-ITVC-Basic-05
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