2 connection area of the low temperature option – SMA SC 500HE-US Installation User Manual
Page 49
SMA America, LLC
8 Electrical Connection
Installation Manual
SC500HEUS-IA-US_en-14
49
8.2.2 Connection Area of the Low Temperature Option
For the low-temperature option, the supply voltage for the heating elements is provided by means of
the external terminals. If the ambient temperature is below –13°F (–25°C), the heating elements
switch on. This ensures that the temperature in the inverter cannot decrease any further.
Position Designation
Wire size
A
Heating
‒
B
X481: 24 V signal. The 24 V signal
disconnects the auxiliary power supply
of the inverter.
AWG12
In accordance with National Electrical Code
®
ANSI/NFPA 70
C
X483: The 24 V signal switches on/
disconnects the inverter externally.
AWG12
In accordance with National Electrical Code
®
ANSI/NFPA 70
D
X482: 230 V supply voltage of the
heating.
AWG14
In accordance with National Electrical Code
®
ANSI/NFPA 70
E
X220: 208 V control voltage.