Installation, Operation and Maintenance Manual
September 2019
MAN720_IMVS2000v2_IOM Rev. 6
Section 5: Working Principle
Working Principle
Section 5: Working Principle and
Detailed Description
5.1
Working Principle
The IMVS2000v2 is a PST device designed to diagnose an actuator/valve system. It directly manages the
SOVs of the control panel (up to two). It offers the possibility to check all the parts of the system: Valve,
Actuator and SOVs (Solenoid Valves).
The IMVS2000v2 can automatically find the mechanical stoppers through the “Calibration” command
(see Section 5.1.1 for details).
The IMVS2000v2 can perform both Partial Stroke (PST) and to the Full Stroke (FST) in opening and
closing and also a SOV Test (in some particular configurations).
For every FST and PST the IMVS2000v2 stores the following data:
•
Time (seconds)
•
Pressure 1 (bar or psi) – pressure sensor S1 (*)
•
Pressure 2 (bar or psi) – pressure sensor S2 (**)
•
Process pressure (bar or psi) – pressure sensor S3 (***)
•
Position (%)
•
Pr. 1 – Pr. 2| - absolute value of the difference between Pressure 1 and Pressure 2 (**)
It is possible to set tolerances on time, pressure and position of both FST and PST. During the
commissioning procedure (see 10.7) the IMVS2000v2 stores:
•
the “ideal” opening FST and closing FST (
Baseline Signature
)
•
the “ideal” PST (
Baseline PST
)
The further FSTs (
Maintenance Signature
,
Opening FST
or
Closing FST
) are compared with the
Baseline Signature and further PSTs (
Manual PST
). It is possible to set tolerances on time, pressure
and position of both FST and PST and if the measured values compared to the Baseline ones, overtake
these settings the IMVS2000v2 generates dedicated alarms (see Sections 5.2.7 and 8 for details).
See Sections 5.1.2, 5.1.6, 5.1.8, and 5.1.9 for details about Signature, FST and PST.
The IMVS2000v2 offers the possibility to monitor:
•
Actuator Pressure
•
Actuator Position
•
Pipeline Pressure (Pressure Sensor S3)
•
PST cycles number
•
FST cycles number
•
Sensors Status (pressure and position)
Dedicated alarms are provided (see Sections 5.2.7 and Section 8 for details).
(*):
if the pressure sensor 1 is enabled.
(**): if the pressure sensor 2 is present and enabled.
(***): if the process pressure sensor is present and enabled.
15
Содержание IMVS2000v2
Страница 2: ......