Fronius String Control 250/30 User Manual
Page 24
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22
Pin assignment
for grounded so-
lar modules
In the case of grounded solar modules, only the ungrounded poles of the solar module
strings may be connected to the protected terminals (A).
Example of pin
assignment for
grounded solar
modules
Pin assignment for solar module grounding on the ne-
gative pole
Pin assignment for solar module grounding on the po-
sitive pole
Connecting solar
module strings to
the Fronius String
Control 250/30
(1)
Tightening torque 6.5 Nm
(2)
Tightening torque 1.5 Nm
(3)
Tightening torque 2.0 - 4.0 Nm
Negative solar module grounding
DC-
DC+
B (in)
B' (out) A' (out)
A (in)
Positive solar module grounding
DC+
DC-
B (in)
B' (out) A' (out)
A (in)
(
B
)
(
A
)
(
B‘
)
(
A‘
)
-
+
(
B
)
(
A
)
(
B‘
)
(
A‘
)
-
+
(1)
(2)
1
2
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