SMA SC 400HE Installation - Manual (Page 72)

External Connections SMA Solar Technology AG
72 SCxxxHE-IEN104432 Installation Guide
6.5 Connecting the Internal Power Supply
The energy required for operating the Sunny Central is either provided via an external power supply
or internally, directly at the AC outlet of the Sunny Central via an internal power supply transformer.
The grid connection structure for internal power supply is, as standard, a TN-S grid.
6.5.1 Connecting the External Power Supply
The external power supply of the internal power supply is 3-phase
It is obligatory to follow the circuit diagram provided when connecting the internal power
supply!
Cable routing of the internal power supply
The cable is fed in together with the communication unit through the sliding plate in the floor
of the AC cabinet.
Minimum connected load
The minimum connected load to be provided per phase is 1 500 W.
WARNING!
Risk of death due to burns and electric shock when live parts are touched!
• Do not touch the live components of the Sunny Central, the power distribution grid or
the low-voltage grid.
• Observe all applicable safety precautions.
• Only work on the device when it is switched off and voltage-free.
Internal overvoltage protector
An internal overvoltage protector is provided for in the Sunny Central for the internal power
supply of the inverter.
External automatic circuit breaker
The internal power supply should be externally protected using a suitable automatic circuit
breaker.