SMA SC 400HE Installation - Manual (Page 12)

Safety SMA Solar Technology AG
12 SCxxxHE-IEN104432 Installation Guide
Emergency Stop
In plants having more than one device, the respective emergency stop switches must be connected
together and checked for correct operation as described in this installation guide. The emergency stop
circuit may only be supplied with voltage from a single device.
2.2.5 Power Supplies
Requirements for the Use of External Power Supplies
• All connections have been made according to the installation guide and the circuit diagram.
• The grounding conductor for grid feed-in and for internal power supply has been made.
• The device is switched off. The key switch is in the “Stop” position and the main switches are off.
• The DC input fuses (internal or external) are connected and the protection against contact
(Plexiglas covers) is mounted.
• The nominal voltages, frequencies and the right-hand rotary field are maintained.
• The polarity of the DC voltage at the inputs / fuse inputs (device dependent) has been checked.
• The polarity of the DC voltages at the inverter input (device dependent) has been checked.
• The photovoltaic generator has been checked with an insulation test to ensure that there is no
ground fault.
Emergency stop circuit
• The emergency stop circuit may only be supplied by a Sunny Central.
• Correctly mount the bridges on the device's emergency stop terminal strip.
WARNING!
Risk of lethal electric shock.
High voltages are present in the device.
• The grounding conductor must be made before the external voltage is switched on.
• At the AC grid connection terminal, the nominal voltage, frequency and the
right‑hand rotary field have to be maintained.
• The correct polarity and ungroundedness must be ensured before inserting the DC
input fuses (internal or external). The fuses may only be inserted and / or removed
under load-free conditions and using the appropriate personal protective equipment
and fuse carriers.
• When the DC fuses (internal or external) have been inserted, reverse voltage exists,
via the Sunny Central busbars, on all externally connected DC main distribution
boxes and DC sub-distribution boxes (Sunny String Box).
• The doors must remain closed when connecting the supplies!