EN
70
8.2.4.6 Operations on Internal DC disconnect switches (15)
• Open the internal DC switches
(07)
.
PV Arrays
Internal AC
Switch
INVERTER UNIT
(Unit under service)
PV Arrays
External DC
Switch
Internal DC
Switches
Internal AC
Switch
INVERTER UNIT
External Main LV
AC Switch
External LV
AC Switch
LV Distriubution
Panel
MV Switch
LV/MV
Transformer
External DC
Switch
Internal DC
Switches
OPEN+LOTO
External LV
AC Switch
OPEN+LOTO
OPEN
+
LOTO
• Affix designated lock preventing operation onto all DC disconnect switches
(15)
, affixing designated tags (LOTO procedure).
• Check on the Synoptic
(03)
the shutdown command has been carried out (Missing DC voltage status): All LEDs OFF.
NOTE –
D
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 LED icons may require some minutes (see
“Regulatory and identification Label”
on the inverter).
The below picture represents the expected status of the switches in the plant after the switching operations has been completed.
PV Arrays
Internal AC
Switch
INVERTER UNIT
(Unit under service)
PV Arrays
External DC
Switch
Internal DC
Switches
Internal AC
Switch
INVERTER UNIT
External Main LV
AC Switch
External LV
AC Switch
LV Distriubution
Panel
MV Switch
LV/MV
Transformer
External DC
Switch
Internal DC
Switches
OPEN+LOTO
External LV
AC Switch
OPEN+LOTO
OPEN
+
LOTO
8.2.4.7 Discharge of the capacitor
Wait the internal capacitors to be discharged.
WARNING –
B
The discharge time of the stored energy is indicated on the regulatory label.
8.2.4.8 DC quick fit connectors disconnection
• Check with the current probe the absence of current on the string cables.
• Remove all quick fit DC connector (PV Connector) from the Inverter using the proper tool. In order to avoid mechanical interferences, use
a cable tie to collect the disconnected cables.
NOTE –
D
It is highly recommended to put labels on the cables in order to easily reconnect them to the correct connectors once
completed the service activities.
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