PV Powered 3000 Manual de instalación descargar pdf (Pagina 59)

SMA Solar Technology AG Troubleshooting

Installation Manual SB25_30-IA-IEN115050 59

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, and thus the red LED is lit.

Check the function of the varistors as described below:

1. Open the inverter as described in Section 7.2 "Opening the Inverter" (page45).

2. Using a multimeter and with both varistors installed,

determine whether there is a conductive connection

between terminals 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 error in the inverter.

• Contact the SMA Service Line

(see Section 13 "Contact" (page72)).

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PV Powered 3000 Manual de instalación Pagina 59