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001004AG
8 - Maintenance
6. Operations on Internal DC disconnect switch
16
•
Open the internal DC switch
16
(blue in the below picture).
PV Strings
External DC
Switch
INVERTER 1
(Unit under service)
OPEN+LOTO
External LV
AC Switch
External Main LV
AC Switch
MW Switch
LV/MW
Transformer
OPEN+LOTO
OPEN
+
LOTO
PV Strings
External DC
Switch
INVERTER 2
External LV
AC Switch
LV Distriubution
Panel
I
nternal DC
Switch
Internal DC
Switch
•
Affix designated lock preventing operation onto DC disconnect
switch
16
, affixing designated tags (LOTO procedure).
•
Check on the status LEDs
06
the shutdown command has been
carried out (Missing DC voltage status):
All LEDs OFF
.
The time needed for the complete shut-down of the LEDs depends by the input voltage of the
inverter. The complete shut-down of the LEDs may require some minutes.