Failsafe handling, 1 introduction, 2 failsafe active latched – Yokogawa YVP20S User Manual
Page 162: Failsafe handling -1, Introduction -1, Failsafe active latched -1
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17. FAILSAFE HANDLING
17.1 Introduction
For the selected positioner, ValveNavi will constantly monitor the status of the actual valve
position parameter FINAL POSITION VALUE in Transducer (TB) block to report and
manage Failsafe events. The actual status of Failsafe is determined by the parameter
RELEASE FAILSAFE in TB. To configure the Time 2 parameter to force Failsafe because
of sustained deviation, refer to Position setup configuration. If the IVI is open, the Fail Safe
Status window automatically opens to display a Failsafe status. The window can also be
opened manually from the View menu in the Main screen. Once the Fail Safe Status
window is displayed, it will remain open until closed by the user. Failsafe can interact with
other configuration settings in ways which make it very difficult to recover from failsafe.
17.2 Failsafe Active Latched
The following Fail Safe Status window will pop up when the selected device is in Failsafe
Active Latched condition.
Figure 17.1 Failsafe Active Latched Dialog