SMA SUNNY MINI CENTRAL 6000TL - Page 70

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70 SMC6-8TL-IEN101040 Installation Guide
You can check the varistors as follows:
1. Open the inverter as described in section 7.2”Opening the Inverter” (page52).
2. Use a Multimeter to ensure that both 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 with the help of the illustration below.
Observe the following allocation 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 Action
☑There is a conductive connection. There is probably a different fault in the inverter.
• Close the inverter as described in section
7.3”Closing the Inverter” (page55).
• Contact the SMA Serviceline (see section
13”Contact” (page85)).
☑There is no conductive
connection.
The respective varistor is defective and must be replaced.
Varistor failure is generally due to influences which affect
all varistors similarly (temperature, age, induced
overvoltage). SMA Solar Technology AG recommends
that you replace both varistors.
The varistors are specially manufactured for use in the
inverter and are not commercially available. You must
order replacement varistors directly from SMA Solar
Technology AG (see section 12”Accessories”
(page84)).
• To replace the varistors, proceed to step 3.