BIFFI IMVS2000v2 - Section 8: Table of Alarms

Installation, Operation and Maintenance Manual
September 2019
MAN720_IMVS2000v2_IOM Rev. 6
Section 8: Table of Alarms
Table of Alarms
Section 8: Table of Alarms
Table 9.
Alarm Acronym Composition Squelched By (*) (**) (***)
PST Cycle
Limit
PSCL
The “PST Cycle Count” exceeds the “PST Cycle Limit”
“PST Cyc. Cnt” >= “PST Cyc. Lim.”
It is cyclically check (period = 30 seconds)
The check is interrupted during Calibration, Signatures and PST
executions.
• “Al. PSCL En.” = “No”
• “Reset Alarms” command
• Power-on Reset
PST Cycle
Time Limit
PSCT
(***)
The PST Cycle Time is greater than the PST Maximum Time.
“B. PST B. T.” + “B. PST T. T.” > “PST Max. Time” or
“M. PST B. T.” + “M. PST T. T.” > “PST Max. Time” or
“Fail Mode”=“CL” and Start position <= 10 0% - “Op. Br. Pos” or
“Fail Mode”=“CL” and Last Position plotted <100%-“Op. Br. Pos.”
“Fail Mode”=“OP” and Start position >= “Cl. Br. Pos” or
“Fail Mode”=“OP” and Last Position plotted >0%+“Cl. Br. Pos.”
A new PST (without the above conditions) resets this alarm.
• “Al. PSCT En.” = “No”
• “Reset Alarms” command
• Power-on Reset
• Calibration
• Baseline Signature
PST Slow
Break Time
PSSB
Last “Manual PST Break Time” is slower than the “Baseline PST
Break Time” by more than “PST Time Hysteresis.”
“M. PST B. T.” > “B. PST B. T.” * (1 + “PST Time %” /100)
A new PST (without the above condition) resets this alarm.
• “Al. PSSB En.” = “No”
• “M. PST B. T.” = 0
• “Reset Alarms” command
• Power-on Reset
• Calibration
• Baseline Signature
• Baseline PST
PST Fast Break
Time
PSFB
Last “Manual PST Break Time” is faster than the “Baseline PST
Break Time” by more than “PST Time Hysteresis.”
“M. PST B. T.” < “B. PST B. T.” * (1 - “PST Time %” /100)
A new PST (without the above condition) resets this alarm.
• “Al. PFSB En.” = “No”
• “M. PST B. T.” = 0
• “Reset Alarms” command
• Power-on Reset
• Calibration
• Baseline Signature
• Baseline PST
PST Slow
Travel Time
PSST
Last “Manual PST Travel Time” is slower than the “Baseline PST
Travel Time” by more than “PST Time Hysteresis.”
“M. PST T. T.” > “B. PST T. T.” * (1 + “PST Time %” /100)
A new PST (without the above condition) resets this alarm.
• “Al. PSST En.” = “No”
• “M. PST T. T.” = 0
• “Reset Alarms” command
• Power-on Reset
• Calibration
• Baseline Signature
• Baseline PST
PST Fast Travel
Time
PSFT
Last “Manual PST Travel Time” is faster than the “Baseline PST
Travel Time” by more than “PST Time Hysteresis.”
“M. PST T. T.” < “B. PST T. T.” * (1 - “PST Time %” /100)
A new PST (without the above condition) resets this alarm.
• “Al. PFST En.” = “No”
• “M. PST B. T.” = 0
• “Reset Alarms” command
• Power-on Reset
• Calibration
• Baseline Signature
• Baseline PST
PST Set Point
Exceeded
PSSP
Last Manual PST exceeds the “extreme” position reached
during the Baseline PST by more than “PST Position Hysteresis.”
If “Fail Action” = “CL” : B < A - “PST Pos. %”
If “Fail Action” = “OP”: B > A + “PST Pos. %”
where:
A = “extreme” position reached during the “Baseline PST”
B = “extreme” position reached during the last “Manual PST”
A new PST (without the above condition) resets this alarm.
• “Al. PSSP En.” = “No”
• “Reset Alarms” command
• Power-on Reset
• Calibration
• Baseline Signature
• Baseline PST
PST Start
Position
PSSR
(***)
In case of Fail to Close actuator (“Fail Act.” = “CL”):
If one of the following conditions is true:
- the last PST start position differs from 100% by more than the
“Open Position Hysteresis” (“Op. Pos. %”).
- osition <= PST Setpoint
In case of Fail to Open actuator (“Act. Mode” = “FTO”):
If one of the following conditions is true:
- the latest PST start position differs from 100% by more than
the “Closed Position Hysteresis” (“Cl. Pos. %”).
- Position >= PST Setpoint
• “Al. PSSR En.” = “No”
• “Reset Alarms” command
• Power-on Reset
• Calibration
• Baseline Signature
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