ABB PVS-100-TL-B-SY2 Product Manual page 149

Unit under service
Internal DC
Switches
OPEN
+
LOTO
External DC
Switch
(If present)
PV Strings OPEN+LOTO
Internal DC
Switches
External DC
Switch
(if present)
PV Strings
Internal DC
Switches
External DC
Switch
(if present)
PV Strings
The below picture represents the expected status of the switches in the
plant after the switching operations have been completed.
Inverter 1
Power
Module
Internal AC
Switch
Wiring
(if present)
Box
OPEN
+
LOTO
External LV
AC Switch
OPEN+LOTO
Inverter 2
Power
Module
Internal AC
Wiring
Switch
Box
(if present)
External LV
AC Switch
Inverter 3
Power
Module
Internal AC
Wiring
Switch
Box
(if present)
External LV
AC Switch
8. Remove the DC quick fit connectors
• Using the current clamp check the absence of current on DC side,
measurement each positive and negative DC input string cables (check
the correct setting of the current sensor).
• Remove all quick fit DC connectors
box , using the dedicated disconnect tool. To avoid mechanical
02
interferences, use a cable tie to collect the disconnected cables.
After the intervention, before reconnecting the quick-fit DC connectors in
their counterparts, make sure about the followings (for each connection):
Checks related to the inverter:
For each input channel, verify the absence of short circuits between:
• positive and negative terminals
• positive and ground (PE) terminals
• negattive and ground (PE) terminals
The test must be performed using multimeter (set to measure
Ohm) by placing the multimeter's test point inside the inverter DC
connectors, in the same points where the quick-fit DC connectors
(coming from the strings) shall be reconnected.
- 149 -
LV/MW
Transformer
External Main LV
MW Switch
AC Switch
LV Distriubution
Panel
from wiring box
16
(PV Connectors) from the wiring
16
8 - Maintenance
02