BIFFI IMVS2000v2 - Page 29

Installation, Operation and Maintenance Manual
September 2019
MAN720_IMVS2000v2_IOM Rev. 6
Section 5: Working Principle
Working Principle
Figure 9
During the SOV TEST, the SOV B is briefly used for a short period of time to generate a pressure drop
inside the cylinder (detected by pressure sensor) without generating the actuator’s movement.
The “SOV TEST Time” is automatically set by the IMVS2000v2.
In this configuration:
• SOV A is used for the PST
• SOV B is just used for its own SOV TEST (picture above).
The SOV TEST is executed only on to the SOV B.
The SOV B is not involved in the other commands of the IMVS2000v2 (Calibration, Signatures and PST),
for these commands the SOV A is used.
“PST St.” doesn’t describe the result of the last “SOV B TEST."
If the command is received, but:
- “Cal. Status” ≠ “Passed” or
- “Base. S. St.” ≠ “Passed” or
- “B. PST St.” ≠ “Passed” or
- “Pr. S. 1-2” = “None” or
Then:
- The command is not executed
- The PSB Alarm is activated (if enabled)
- The graph is not stored
If the command is received, but:
- “Cal. Status” = “Passed” and “CAL Alarm” is active or
- “POS Alarm” is active or
- “HSP Alarm” is active or
- “LSP Alarm” is active or
- The start position is not valid
Then:
- The command is not executed
- The PSB Alarm is activated (only if the start position is not valid)
- The graph is not stored
If a problem is verified during the SOV B TEST execution:
- The PSB Alarm is activated (if enabled)
- A new graph is stored (the Status is “Failed”)
If the SOV B TEST is successfully executed:
- The PSB Alarm is cleared
- A new graph is stored (the Status is “Passed”)
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