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000972AG
8 - Maintenance
7. Operations on Internal DC disconnect switches
15
•
Open the two internal DC switches
15
(blue in the picture).
PV Strings
Internal DC
Switches
Internal AC
Switch
(if present)
Unit under service
Power
Module
Wiring
Box
OPEN+LOTO
PV Strings
External DC
Switch
(if present)
Internal DC
Switches
Internal AC
Switch
(if present)
External LV
AC Switch
External Main LV
AC Switch
External LV
AC Switch
LV Distriubution
Panel
MW Switch
PV Strings
Internal DC
Switches
Internal AC
Switch
(if present)
External LV
AC Switch
LV/MW
Transformer
Unit under service
Power
Module
Wiring
Box
Unit under service
Power
Module
Wiring
Box
External DC
Switch
(if present)
OPEN+LOTO
External DC
Switch
(If present)
OPEN
+
LOTO
OPEN
+
LOTO
•
Affix padlocks to prevent operation onto all DC disconnect switches
15
.
Affix designated tags (LOTO procedure).
•
Check on the status LEDs
08
if 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.