September 2019
Installation, Operation and Maintenance Manual
MAN720_IMVS2000v2_IOM Rev. 6
MAN720_IMVS2000v2_IOM Rev. 6
Section 5: Working Principle
Working Principle
5.1.1
Calibration
The Calibration is a mandatory operation for using the IMVS2000v2. It must be performed as first
step of the Commissioning Procedure (see Section 10.7 for details). To performe the Calibration, the
IMVS2000v2 must be correctly connected and configured and it must be able to control the valve/
actuator system.
The Calibration is an operation that allows the IMVS2000v2 to find the mechanical stoppers.
The Calibration operation consists of: two Opening FST and two Closing FST and it is “automatically
managed by the IMVS2000v2.
During the execution of the Calibration the Digital Inputs status is not considered. The status of the
Calibration is stored in a dedicated parameter. The Calibration command can be inhibited
(see Section 6 for details). A new Calibration cancels all the stored signatures, FSTs and PSTs data.
The Calibration can be launched by the following interfaces:
•
Local Operator Interface
•
Biffi Assistant (Bluetooth and RS232)
•
Bus Interface
For using the IMVS2000v2 at its own best, it is suggested to perform the Calibration in the
following conditions:
•
Pressures and position stable
•
Valve in its “normal” working position (ex. Open position for a “fail to close” actuator)
5.1.2
Signature
There are two different types of signature:
•
Baseline Signature
•
Maintenance Signature
To performe the Baseline Signature and the Maintenance Signature, the IMVS2000v2 must be
correctly connected and configured and it must be able to control the valve/actuator system.
The Baseline Signature can be performed only if a Calibration is already successfully executed. The
Maintenance Signature can be performed only if a Baseline Signature is already successfully executed.
A new Baseline Signature cancels all the stored Maintenance Signatures, FSTs and PSTs data.
The Baseline Signature and the Maintenance Signature consist of one Opening FST and one Closing
FST and they are “automatically” managed by the IMVS2000v2; at the end of the operation the valve/
actuator system comes back to the starting position.
During the execution of the Baseline Signature or of the Maintenance Signature the Digital Inputs
status is not considered.
The Baseline Signature is a mandatory operation for using the IMVS2000v2. It must be performed as
second step of the Commissioning Procedure (see 10.7 for details).
It allows the IMVS2000V2 to record the reference times and pressures of the Opening FST and of the
Closing FST.
The Maintenance Signature allows the IMVS2000V2 to record the times and pressures of the Opening FST
and of the Closing FST; these values are compared to the ones of the Baseline Signature and if they overtake
the set tolerances, dedicated alarm are generated (see Sections 5.2.7 , 8, 5.1.6 and 5.1.8 for details).
The Baseline Signature and the Maintenance Signature can be launched by the following interfaces:
•
Local Operator Interface
•
Biffi Assistant (Bluetooth and RS232)
•
Bus Interface
16
Содержание IMVS2000v2
Страница 2: ......