SMA SB 1200 Installation - Manual (Page 56)

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56 SB12-17-IA-en-52 Installation Guide
9.3 Red LED is Glowing Continuously
If the red LED of the status display is continuously on during operation, there is either a ground fault
in the PV generator or at least one of the varistors for the overvoltage protection is defective.
Procedure
1. Check for ground faults in the PV generator as described in section 9.3.1 ”Checking the PV
Generator for a Ground Fault” (page 57).
2. If the red LED continues to glow, check the varistors as described in section 9.3.2 ”Checking the
Functioning of the Varistors” (page 59).
VpvMax
Vpv-Max Overvoltage at DC input. The inverter may be damaged.
Corrective measures
Immediately disconnect the inverter from the grid.
1. Turn off the line circuit breaker.
2. Remove the Electronic Solar Switch.
3. Disconnect all the DC plug connectors.
4. Check DC voltage:
– If the DC voltage exceeds the maximum input voltage, check the
plant design or contact the person who installed the PV
generator.
– If the DC voltage is under the maximum input voltage, reconnect
the inverter to the PV generator as described in section 5.4 ”PV
generator connection (DC)” (page 29).
If the message occurs again, disconnect the inverter again and contact
the SMA Serviceline (see section 13 ”Contact” (page 70)).
Watchdog
Watchdog Srr Internal program run fault.
Corrective measures
• If this fault occurs often, contact the SMA Serviceline.
Message Description and corrective measure