SMA SSM-U-1615 - Manual (Page 49)

9 Troubleshooting
9.1 LED States
9.1.1 Status LEDs of the SMA String-Monitor
An overview of the LEDs can be found in Section 4.7, page 20.
LED Status Cause and corrective measure
UPD (yellow) Off* No update in progress at present.
flashing Update in progress at present.
ERR (red) On The electronic assembly is defective.
Corrective measures:
• Contact the Service (see Section 15, page 74).
Off Normal operation
AL (green) Off* The firmware is faulty.
Corrective measures:
• Update the firmware of the SMA String-Monitor
(see inverter manual).
On The firmware is faulty.
Corrective measures:
• Update the firmware of the SMA String-Monitor
(see inverter manual).
flashing The firmware is OK.
PWR (green) Off Supply voltage is too low or too high.
Corrective measures:
• Make sure that the supply voltage to the DC
subdistribution is OK.
– If you are using the power supply assembly
for the external power supply (available as an
accessory), ensure that the external 230 V
AC
supply voltage is correctly connected (see
manual "Power Supply Assembly for External
Power Supply of SMA String-Monitors").
– Ensure that the supply voltage of the DC
subdistribution from the PV field is correctly
connected.
On The supply voltage is OK.
9 Troubleshooting SMA Solar Technology AG
Operating Manual 49 SSMUXX15-BE-en-10