SMA SMC 7000HV Installation - Manual (Page 76)

Troubleshooting SMA Solar Technology AG
76 SMC70HV11-IA-IEN112970 Installation Manual
9.3.2 Checking the Function of the Varistors
Varistors are wear parts. Their functional efficiency diminishes with age or repeated strain as a result
of overvoltage. It is therefore possible that one of the thermally monitored varistors has lost its
protective function.
You can check the varistors in the following manner:
1. Open the inverter as described in section 7.2 "Opening the Inverter" (page 56).
2. Use a multimeter to ensure that all of the varistors in
the installed state have a conducting connection
between connectors B and C.
Position of varistors
You can determine the position of the varistors using the illustration below.
Observe the following assignment of the
terminals:
• Terminal A: outer terminal
(varistor connection with loop [crimp])
• Terminal B: middle terminal
• Terminal C: outer terminal
(varistor connection without loop
[crimp])
Result Measure
☑ There is a conducting
connection.
There is probably a different fault in the inverter.
• Close the inverter as described in section 7.3 "Closing
the Inverter" (page 59).
• Contact the SMA Serviceline (see section 13 "Contact"
(page 85)).