Red Led Is Permanently Lit - SMA SUNNY MINI CENTRAL 4600A Installation Manual

Troubleshooting
Message
UpvMax
Watchdog
Watchdog Srr
9.3 Red LED is Permanently Lit
If the red status display LED is permanently lit during operation, there is a ground fault in the PV array
or at least one of the varistors for overvoltage protection is defective.
Procedure
1. Check for ground faults in the PV array as described in section 9.3.1 "Checking the PV Array
for Ground Faults" (page 71).
2. If the red LED continues to be lit, check the varistors as described in section 9.3.2 "Checking the
Function of the Varistors" (page 73).
70 SMC46-60A-IA-IEN120471
Description and corrective measure
Overvoltage at DC input. The inverter may be damaged.
Corrective measures
Disconnect the inverter from the power distribution grid immediately.
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 33).
If the message occurs again, disconnect the inverter again and contact
the SMA Service Line (see section 13 "Contact" (page 86)).
Internal program run fault.
Corrective measures
• If this fault occurs frequently, contact the SMA Service Line.
SMA Solar Technology AG
Installation Manual