SMA SB 3000TL-US Installation - Manual (Page 41)

SMA America, LLC 6 Electrical Connection
Installation Manual SB3-5TLUS22-IA-en-16 41
6.4.3 Connecting the PV Array
1. Switch off or open all AC disconnecting switches and circuit breakers in the output circuit of the
inverter and secure against reconnection.
2. If an external DC disconnecting switch is available, switch off or open the DC disconnecting
switch.
3. If there is no external DC disconnecting switch available, cover the PV modules with opaque
material or disconnect the connectors on the PV modules.
4. Ensure that no DC voltage is present on the DC cables of the PV array.
5. Loosen the screw on the lower side of the
DC Disconnect using an Allen key (AF 4) and
remove the lid of the DC Disconnect.
6. Snap out the required number of knockouts on the
desired side of the DC Disconnect for the
installation of the conduit fittings
(diameter
1
⁄
2
in.,
3
⁄
4
in. or 1 in.).
Destruction of the inverter due to overvoltage
If the open-circuit voltage of the PV modules exceeds the maximum system voltage of the inverter,
the inverter can be destroyed by overvoltage.
• Ensure that the open-circuit voltage of the PV modules does not exceed the maximum input
voltage of the inverter.
• Otherwise, do not connect strings to the inverter; check the design of the PV system.