User Manual

15
Safety
(continued)
CAUTION! Danger of damaging the Fronius String Control 250/
25 from improperly connected terminals. Improperly connected
terminals can cause thermal damage to the Fronius String
Control 250/25 and may cause a fire. When connecting all DC
‘IN’ and DC ‘OUT’ cables, make sure that all terminals are
tightened securely using the proper torque.
To ensure problem-free DC cable connections to the terminals, all DC
cables inside the Fronius String Control 250/25 must have a certain mini-
mum length.
Depending on which side the DC cables are inserted from into the Fronius
String Control 250/25, different minimum lengths of the DC cables are
needed.
For the minimum inside cable length of the Fronius String Control 250/25:
- consider the guidelines in the following figure
- consider the mandatory forming of a min. 4 in. wire loop
Necessary
Inside Cable
Length of the
Fronius String
Control 250/25
25.16 in. 639 mm
7.83 in. 199 mm
3.98 in. 3.90 in.
12.05 in. 306 mm
20.08 in. 306 mm
25.47 in. 647 mm
101 mm
99 mm