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Discrete Switch Configuration
The SVI FF has a discrete switch (contact) DS1, which can be used to drive external equipment
(up to 24 V/1 A). Discrete Switch 1 can be activated if one of the following diagnostic
conditions is detected:
A failure in position control algorithm and the actuator is in Fault (de-energized) State
The position control algorithm is not In Normal state
Device Need Maintenance Soon
Device Needs Maintenance Now
Air Supply Alert – HI, LO or LOLO alert condition is active
Travel Deviation Alert
Position HI Alert
Position LO Alert
Position control algorithm has been re-initialized
Tight cutoff is active
This switch can be used (with minimal external equipment – e.g. one solenoid and no
additional logic) to keep the valve in place when the supply pressure drop or when the valve
position is above the High Limit and Hi Position Alert is reported.
Processing to DI Block
If you want to detect a discrete condition, but do not want to drive the external contact, a
Virtual Switch, VS2, is available in the SVI FF device. VS2 can be configured in a similar way as
Discrete Switch 1, the difference being that no physical contact changes - just an internal
boolean.
Discrete Switch DS1 or Virtual Switch VS2 can be provided on the fieldbus and additional
actions can be taken by the DCS application. For more information see the table Channels for
Discrete Input Blocks in the SVI FF Function Blocks Instruction Manual (GEA31248).
Conclusion
The SVI FF provides a comprehensive mechanism for positioner self-diagnostics and an
extensive number of user-configurable procedures for valve and actuator diagnostics.
The detected conditions can be reported to the host in multiple ways, providing flexibility and
easy integration of the SVI FF positioner in any host application.
© 2019 Baker Hughes, a GE company, LLC. All rights reserved.
Masoneilan SVI FF Instruction Manual
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Troubleshooting
