Siemens UL489 Quick Start Manual page 10

WL Electronic Trip Unit Status Indicators and Features
Trip Unit LED Indicators
ACTIVE (FLASHING) – Trip unit is active
ALARM – Overcurrent alarm
COMM. – Communication active (another CubicleBUS module was
recognized and communication started)
EXTEND – Extended protective function has tripped
TRIP L, TRIP N, TRIP S, TRIP I – Protective function has tripped
(indicator is illuminated if the Query button is pressed, only the last trip
cause is displayed)
T.U. ERROR (FLASHING) – limited protection function, the protective
parameters are reset to minimum values
T.U. ERROR (SOLID) – protective function not guaranteed
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