Appendix L.2 Loop Automation Status Messages
When Loop Automation is activated, its current status is displayed in WSOS on the Loop Automation Display page as well as on both flexVUE and setVUE operator interfaces.
All possible status messages appear in the list below.
Table 152 List of Loop Automation status display messages
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Loop automation normal |
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Loop auto turned off by operator action. Must be on for automatic operation. |
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Mechanism fail or switchgear data invalid. |
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Gas pressure low |
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Gas pressure invalid. |
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Cap charge fail or battery abnormal |
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Loss of phase trip. Will close when load supply restored/will close when source supply restored/operator restoration required/loop automation turned off. |
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Protection trip – will close when both source and load supplies come on. |
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Protection trip/sectionaliser trip Operator restoration required/loop automation turned off. |
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Work Tag applied. |
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Loop auto on request denied. Trip/Close circuit disconnected/mechanism fail or switchgear data invalid/cap charge fail or battery abnormal/gas low inhibit/invalid VT configuration/switch must be open/switch must be closed/currently not available/work tag applied. |
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Currently not available. |
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Source side now dead – timing out Will trip to isolate source/will change to protection group #/protection group # now active/will close to restore source supply/detected allow DT. Will close to restore. |
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Tripped on loss of source supply Will close when source supply restored. |
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Tripped on loss of source supply |
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Source and load now live – timing out Will close to restore normal state. |
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Source side now live – timing out Will close to restore normal state/will close to restore load supply. |
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Loss of phase trip Will close when source supply restored/will close when load supply restored/loop automation turned off. |
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Lost source supply – PROT GRP # active Loop automation turned off. |
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Load side now live – timing out Will close to restore normal state. |
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Load side now dead – timing out Will close to restore load supply/detected allow DT. Will close to restore. |
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Load side now dead Measuring dead time |
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Source side now dead Measuring dead time |
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Source and load sides dead |
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Closed to restore load supply |
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LA time expired – allow DT not detected Loop automation turned off |
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Loop automation normal Detected allow dead time |
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Closed to restore source supply |
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LA time expired – allow DT not detected Loop automation turned off |
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Normal FDR config. detected – timing out Will trip to restore normal FDR config. |
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Supply lost – loop auto turned off. |
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Auto-restore unsuccessful |
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Unable to trip/close |
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Downstream operator failure Operator restoration required |
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Upstream lockout Operator restoration required |
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Communication error Operator restoration required |
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Loop automation close inhibited Loop automation turned off. |