Masoneilan SVI3 Installation and Maintenance Manual
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7.4.1 Online Valve Diagnostics
7.4.1.1 Overview
The SVI3 Digital Valve Positioner marks a new era in smart valve instrumentation with
the introduction of a full suite of Online Valve Diagnostics, designed to improve plant
efficiency and process uptime. The Online Valve Diagnostics consist of Key Performance
Indicators (KPI’s) which are continuously calculated while the valve is in service,
providing real insights to actual operating performance of the valve system without the
need to take a process offline. With simple configuration of alerts, the SVI3 will
automatically notify plant personnel as KPI’s begin to drift out of the allowable range,
bringing attention to specific situations before they become a problem. Additionally,
internal memory has been expanded, providing 1 years’ worth of KPI data storage for
trending and analysis – thus, collecting and storing data to give operators a safety
window for analysis even for those valves in the fleet that were excluded from a planned
diagnostic program. Maintenance activities can simply be prioritized across the fleet,
utilizing actual operating data over time to drive decision making, ensuring that the valves
which need servicing are scheduled.
Understanding the KPI calculations will help with proper setup and support analysis of
data for proper actions. The following section defines the KPIs and provided insights to
the common use cases.
7.4.1.2 Data Storage
The SVI3 KPI data is continuously calculated and stored directly within the device.
Depending on the run time of the SVI, the following data points are available:
• Current – “Most Recent” data as measured by the device (Upon request)
• Hourly – Each hourly record is the average of the last 60 minutes of
measurements (total of 24)
• Daily – Each daily record is the average of the last 24 hourly records (total of 7)
• Weekly – Each weekly record is the average of the last 7 daily records (total of 52)
After 1 year, the oldest data will be moved out and the device will contain only the newest
1 year’s data saved.
The data is continuously available through HART via the SVI3 DTM. Users have the
option to synchronize the DTM with the SVI3 as often as they want, which will build a
more detailed database than what is available on the device itself. For instance, if a user
synchronized with the SVI3 every day for 30 days, they would have 24*30 = 720 hourly,
30 daily, and 4 weekly data points.
7.4.1.3 Interfaces
The SVI3 with Online Valve Diagnostics is best operated in parallel with the SVI3 DTM
(Device Type Manager). The SVI3 DTM provide all access to the advanced features
within the SVI3, including online, offline, and continuous diagnostics.
For a more detailed
instruction regarding the use of the DTM, please refer to the DTM Manual.