DVG ITVC Series, Manual

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ITVC Series – Intelligent Total Valve Controller IOM-ITVC-LB-04
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3.10 Diagnostics
3.10.1 CPU diagnostics
Diagnostics processed by each CPU includes: Diagnostics of comparison between the two CPUs, Software flow
diagnostics, Watchdog, System clock monitor and Detection of a fault not imputable to an identified channel:
o
Power supply diagnostics
o
Temperature diagnostics
o
Comparison diagnostics of redundant channels (1oo2 architecture)
o
CPUs Comparison diagnostic
In case of the above mentioned instances, system switches to safe state.
3.10.2 Analogue inputs diagnostics
The range-ability of the analogue input circuits is from 3 to 21 mA.
CPU’s 1 and 2 perform the following diagnostics:
 Under-range and Over-range

Both CPU’s assumes that if signal is <3mA or >21mA the transmitter or the acquisition stage is damaged
Action performed:
o
1oo1 architecture:

Valve Control (SOV energization and closure of actuator)

Local alarm and display of type of fault

Switch-over of Monitor relay
o
1oo2 architecture:

Local “MRT timer” alarm and display of type of fault

Switch-over of Monitor relay

Exclusion of damaged channel

Operation in 1oo1 architecture for a maximum time equal to MRT. Correct system must be
restored (repair or replace the device) or Valve Control will be carried out at the end of MRT
time. The menu option MRT, in the Measurement menu, displays the remaining time before
than MRT time ends
 Valve Control will be carried out if the surviving analogue channel fails in the MRT time
o
1oo3 architecture:

Local “MRT timer” alarm and display of type of fault

Switch-over of Monitor relay

Exclusion of damaged channel

Operation in 1oo2 architecture for a maximum time equal to MRT. Correct system must be
restored (repair or replace the device) or Valve Control will be carried out at the end of MRT
time. The menu option MRT, in the Measurement menu, displays the remaining time before
than MRT time ends
 In the MRT time, operation in 1oo1 architecture if a further analogue channel fails (due to
over-under range) and Valve Control if also the surviving analogue channel fails
 In the MRT time, Valve Control if comparison between the two channels fails
o
2oo3 architecture:

Local alarm and display of type of fault

Switch-over of Monitor relay

Exclusion of damaged channel

Operation in 1oo2 architecture for a maximum time equal to MRT. Correct system must be
restored (repair or replace the device) or Valve Control will be carried out at the end of MRT
time. The menu option MRT, in the Measurement menu, displays the remaining time before
than MRT time ends
- In the MRT time, Valve Control will be carried out if the remaining analogue channels
fail (due to over/under range or out of comparison)