SMA SMC 4600A Installation - Manual (Page 63)

SMA Solar Technology AG Troubleshooting
Installation Manual SMC46-60A11-IA-en-81 63
9.3 Red LED is Permanently Glowing
If the red status display LED is permanently glowing during operation, there is an earth fault in the PV
array or at least one of the varistors for overvoltage protection is defective.
Procedure
1. Check for earth faults in the PV array as described in Section 9.3.1 "Checking the PV Array for
Earth Faults" (page 64).
2. If the red LED continues to be glowing, check the varistors as described in Section 9.3.2
"Checking the Function of the Varistors" (page 66).
VpvMax Overvoltage at the DC input. The inverter may be damaged.
Corrective measures
Immediately disconnect the inverter from the electricity grid.
1. Disconnect the miniature circuit-breaker.
2. Remove the Electronic Solar Switch.
3. Remove all DC connectors.
4. Check the DC voltage:
– If the DC voltage is above the maximum input voltage, check the
PV plant design or contact the PV array installer.
– If the DC voltage is below the maximum input voltage,
reconnect the inverter to the PV array as described in
Section 5.4.4 "Connecting the PV Array (DC)" (page 31).
If the message occurs again, disconnect the inverter again and contact
the SMA Service Line (see Section 13 "Contact" (page 80)).
Watchdog
Watchdog Srr Internal program run disturbance.
Corrective measures
• Contact the SMA Service Line if this disturbance occurs frequently.
Message Description and corrective measure