SMC Networks Sunny Mini Central SMC 5000A - Manual (Page 65)

SMA Technologie AG Troubleshooting / Problem Solving
Installation Guide SMC50A_60A-IEN073320 Page 65
11.2.2 Checking the Varistors
Varistors are wearing parts. Their functioning diminishes with age or following repeated
responses as a result of overvoltages. It is therefore possible that one of the thermally
monitored varistors has lost its protective function. You can now check these varistors in
the following way, paying attention to the safety instructions in section 10.1 "Safety
Instructions" (Page 58):
Step Instruction
1 Open the Sunny Mini Central as described in section 10.2 "Opening of the
Sunny Mini Central" (Page 59).
2 Use a continuity tester to check all the varistors and see if there is a
conducting connection between connectors 2 and 3. The positions of the
varistors in the Sunny Mini Central can be seen in the figure in section 4
"Overview of the Device" (Page 12).
Event Measure
There is a conducting
connection.
It is likely that there is a different fault in the
Sunny Mini Central which has activated the
blink code.
Close the Sunny Mini Central again as
described in section 10.3 "Closing of the
Sunny Mini Central" (Page 60) and contact
the SMA Serviceline to discuss further steps.
There is no conducting
connection.
The respective varistor is not working and
must be replaced.
The varistors are specially manufactured for
use in the Sunny Mini Central and are not
commercially available. They must be
ordered directly from
SMA Technologie AG
(SMA order code: "SB-TV4").
To replace the part, proceed to step 3.