SMA SB 240 User Manual
Page 38
Cable requirements for use of AC field plug:
☐ When using the AC field plug, observe the cable requirements for assembling the AC field
Cable requirements for use of junction box:
☐ Cable cross-section: 2.5 mm²
☐ Temperature-resistant up to at least +90°C
☐ External diameter of the cable sheath: 9.6 mm to 10 mm
☐ Number of stranded wires: 46
☐ Cable type: copper wire, tin-plated
☐ Wire cross-section: 0.25 mm²
Installation of several Sunny Multigate devices
When installing several Sunny Multigate devices in a PV system, a three-wire cable with
grounding conductor must be used for each Sunny Multigate in order to guarantee trouble-
free communication between the Sunny Multigate and the inverter.
Procedure:
1.
Danger to life due to electric shock
• Ensure that the circuit breaker is switched off and that it cannot be reconnected.
• Make sure that the PV modules are covered.
2. When using a junction box, assemble the AC cable and connect it to the junction box in
accordance with the instructions of the manufacturer.
3. Route the AC cable from the AC field plug or the junction box to the terminal Inverter of the
Sunny Multigate.
4. Dismantle the AC cable to the desired length.
5. Strip the insulation of the three AC cable conductors by 8 mm each.
6.
Damage to the Sunny Multigate due to incorrectly connected conductors
If PE and L or N are swapped, the Sunny Multigate could be damaged during commissioning.
• Be sure to observe the terminal labels on the Sunny Multigate.
• Connect all conductors in accordance with the terminal labels.
– Connect the grounding conductor of the AC cable to the terminal PE of the
Sunny Multigate. Make sure that the conductor is inserted into the terminal right up
to the stop.
– Connect the line conductor of the AC cable to the terminal L of the Sunny Multigate.
Make sure that the conductor is inserted into the terminal right up to the stop.
– Connect the neutral conductor of the AC cable to the terminal N of the Sunny
Multigate. Make sure that the conductor is inserted into the terminal right up to the
stop.
6 Electrical Connection
SMA Solar Technology AG
Installation Manual
SMA-SB240-IA-en-12
38