SMA SUNNY TRIPOWER X 20-US - Page 51

6 Electrical Connection
SMA Solar Technology AG
Operating manual STPxx-US-50-BE-en-11 51
Requirements:
☐ The miniature circuit breaker must be switched off and prevented from being reconnected.
☐ The DC load-break switch must be set to OFF and, depending on local regulations, prevented
from restarting using a padlock.
☐ The cables of the PV modules must be equipped with DC connectors.
☐ If the DC terminal cover is available as an accessory, the DC terminal cover must be mounted
on the inverter and the DC cables must be routed through the conduits into the DC term cover
(see Section5.4, page34).
Procedure:
1. Position the enclosure lid and first insert the upper-
left (position 1) and lower-right (position 2) screws
and fasten them hand-tight (TX25).
2
1
2. Insert and tighten all screws (TX25, torque: 6Nm ±
0.3 Nm (53in-lb ± 2.65in-lb)).
10x
3. Strip the insulation of every equipment grounding conductor by 10mm (0.4in).
4. Connect every equipment grounding conductor of
the PV modules to the equipment grounding bar. To
do this, plug the equipment grounding conductor
into a contact opening on the equipment grounding
bar and tighten the corresponding screw using a
cross-head screwdriver (torque: 4Nm (35in-lb).
5. Measuring the voltage of the PV array. Ensure that the maximum input voltage of the inverter is
adhered to and that there is no ground fault in the PV system.
6. Check whether the DC connectors have the correct polarity.