SMA SC 400HE Installation - Manual (Page 91)

SMA Solar Technology AG Commissioning
Installation Guide SCxxxHE-IEN104432 91
7.2 Checking the Sunny Central Cabling
All electrical connections made on-site must be checked for correct connection and secure attachment.
7.2.1 Checking Internal Connections
• Check that the plugs of the transfer terminal strip are in the correct sequence and are securely
in place.
• Check that the transformer or sinusoidal filter connections are securely in place and have the
correct phase sequence.
• Check that the data and control lines are correctly connected to the power unit.
• Check that the data line for insulation monitoring is correctly connected.
• Check the installation location of the internal temperature sensor.
• Check the internal power cabling of the team connection (optional).
• Check the connection between the PE rails of the partial barrier.
7.2.2 Checking the AC Grid Connection
• Check the connections to ensure that they are securely in place.
• Check the phase sequence.
• Check the correct connection in accordance with the circuit diagram.
• Check the PE-N bridge for the grid structure TN-C or TN-S on-site and remove it if necessary.
• Check the correct installation of the covers. Correct installation means that contact protection is
guaranteed.
Equipotential Bonding
• Check whether the Sunny Central is connected to the equipotential bonding of the installation
site.
• Check that the connections are secure.
Checking connections
See the documentation provided and the circuit diagram for the precise electrical
connections.
In particular, note the following points:
• Misconnections.
• Incorrect polarity, in particular for power connections.
Make sure that everything is securely in place.
• Check that the connections have been tightened. Where possible, avoid retightening
in accordance with the torque specifications in the circuit diagram.
• Only retighten connections according to the torque specifications in the circuit
diagram if they are loose.