Disturbance identification - Arc protection - Bay control and measurement - Merging unit - Operation Manual - SMU615 Substation Merging Unit - 1.0 - IEC - ANSI - 06.06.2023

SMU615 Operation Manual

Disturbances and their causes can be identified by the Ready indicator LED. During normal operation, the Ready LED is steady green.

Table 1. Disturbance indications
LED	State	Description
Ready LED	Green, flashing	Internal fault

Further actions to be taken to identify the disturbance:

Checking programmable LEDs
Reading event history
Checking fault records
Analyzing disturbance recordings

Note: Document the disturbance before clearing the information from the merging unit.

Note: Only authorized and skilled personnel should analyze possible errors and decide on further actions. Otherwise, stored disturbance data can be lost.