SMA SB 4200TL HC Multi-String - Manual (Page 26)

Installation SMA Technologie AG
Page 26 SBTLHCMS-IEN080411 Installation Guide
6.2. 2 PV String (DC) Connection
To connect up the DC input, follow these steps:
1. Remove the Electronic Solar Switch.
2. Make sure the PV generator connectors have the
right polarity and do not exceed the maximum
string voltage of 750 V (DC). See also section 5.
2 "PV Generator Requirements" (Page 15).
Warning!
Dangerous high voltages may be present. Danger of death!
3. Taking one DC plug connector at a time, mea-
sure the direct current voltage between one DC
plug connector of a string and earth potential.
4. If the measured voltages are constant and if their
total is roughly the same as the open circuit volt-
age of the string, then there is a ground fault in
this string. Its approximate location can be de-
duced from the relationships between the voltag-
es.
Notice!
Do not connect strings to the Sunny Boy that contain a ground fault until
you have fixed the earth fault in the PV generator!