SMA PVO-N-20 - Manual (Page 45)

SMA Solar Technology AG 10 Troubleshooting
Installation Manual PVO-BOX-IA-en-10 45
10 Troubleshooting
10.1 LED Displays
The LEDs for fault indication are 2-colour. They glow red if operation is currently interrupted. They
glow yellow if a fault has previously occurred, but normal operation is currently possible.
The possible combinations are given in the following table. The "x" entry in the table means that the
previous display of the LED is retained.
Description and corrective measure
Flashing
green x x x x Ready for operation
Green x x x x Operation
x Yellow,
red x x x FE connection fault or AC connection fault:
– L / N swapped
– N not connected (SMA PV Offset Box
connected between L1 and L2)
– FE connection interrupted
– Voltage difference between connected
N conductor and FE larger than 50 V
(AC or DC)
• Check AC-side installation.
x x Yellow,
red x x DC connection fault:
– DC connections reverse poled
– DC connection to PV array interrupted
– Installed in an area with insufficient
irradiation, or irradiation interrupted
during the day
– SMA PV Offset Box is disconnected on
the AC or DC side during the day.
– Regeneration time too short (average
night period is less than 5 hours)
• Check DC-side installation.