SMA SUNNY CENTRAL 900CP XT - Updating the Firmware

12 Cable Connection of External Devices and Connections in the Interface Cabinet SMA Solar Technology AG
60 SCCPXT-IA-D7-en-42 Installation Manual
Requirement:
☐ The Sunny Central must be disconnected (see Section14, page65).
Procedure:
1. Insert the transformer protection cable into the interface cabinet (see Section12.2, page55).
2. Connect the cable in accordance with the circuit diagram (see Section12.3.1, page55).
3. Remove the shield clamping saddle from the busbar.
4. Press the shield clamping saddle down onto the shield of the
stripped cable until it clicks into place and fasten hand-tight.
5. Attach the cable to the cable support rail using a cable tie. This will ensure that the cable cannot be pulled out
inadvertently.
12.3.8 Connecting the External Supply Voltage
The Sunny Central draws electricity for its internal power supply from the external supply voltage. The Sunny Central must
be connected to an external, three-phase supply voltage with 230 V line voltage/400 V line-to-line voltage (3/N/PE)
per phase.
Cable requirement:
☐ The cable must be shielded.
☐ Maximum conductor cross-section: 4 mm
2
Requirement:
☐ The Sunny Central must be disconnected (see Section14, page65).
/05*$&
Damage to the Sunny Central due to incorrect connection of internal power supply
• Connect the neutral conductor N.
• Ground the neutral point of the transformer for auxiliary power supply.
Circuit breaker between the external voltage supply and the Sunny Central
A type-B circuit breaker with a rated current of 16 A is installed in the Sunny Central.
• Provide a selective circuit breaker to protect the cable to the Sunny Central.
Cut the grounding conductor to the correct length
The grounding conductor must be cut to size and connected so that in case of excessive tensile load, the grounding
conductor will only pull out after the live conductors.
• Provide sufficient excess length for the grounding conductor.