PV Powered 2500 Guía de instalación descargar pdf (Pagina 38)

Troubleshooting SMA Solar Technology AG

38 SB25_30-IEN092520 Installation Guide

9.1.2 Checking the Function of the Varistors

Varistors are wearing parts. Their functioning becomes restricted through aging or due to repeated

responses as a result of overvoltages 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 Sunny Boy as described in section 7.1 "Opening the Sunny Boy" (page32).

2. With the aid of a multimeter, determine for both

varistors in the installed state whether a conductive

connection exists between connectors B and C.

Position of varistors

The position of the varistors can be determined with the help of the diagram 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 Measure

☑There is a conducting connection. There is probably another fault in the Sunny Boy.

• Close the Sunny Boy as described in section

7.2 "Closing the Sunny Boy" (page33).

• Contact the Serviceline (see section 13 "Contact"

(page47).

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PV Powered 2500 Guía de instalación Pagina 38