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Connecting the Fronius String Control 250/25 to
the Inverter
Safety
WARNING! An electrical shock can be fatal. Danger from DC
voltage from solar modules.
-
Make sure that the input and output sides in front of the
device are not charged before connecting anything.
-
Any and all connections should only be carried out by quali-
fied electricians.
-
Follow the safety rules in these operating instructions.
WARNING! An electric shock can be fatal. Inadequately sized
electrical components can cause serious injuries to persons
and damage to (or loss of) property.
-
All electrical installations must be in accordance with the
National Electrical Code, ANSI/NFPA 70, and any other
codes and regulations applicable to the installation site.
-
For installations in Canada the installations must be done in
accordance with applicable Canadian standards.
-
Use minimum AWG 12, min. 194 °F (90 °C), copper wire for
all grounding wires .
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For appropriate grounding see NEC table 250.122.
-
Use maximum 250 MCM for cable input from below and
350 MCM for sidewise cable input, min. 194 °F (90 °C),
copper wire for all DC wiring connections to the inverter.
Voltage drop and other considerations may dictate larger
size wires be used.
-
Use only solid or stranded wire. Do not use fine stranded
wire.
WARNING! An electric shock can be fatal. Normally grounded
conductors may be ungrounded and energized when a ground
fault is indicated. The ground fault has to be repaired before
operation is resumed.
NOTE! Do not connect the ground to the negative DC line at any
point! This is already done within the inverter. If negative DC lines
are connected to the DC terminals or prior to this to the ground,
this will circumvent the GFDI protection system, preventing your
inverter from properly detecting a fault current. Additionally, tur-
ning the DC disconnect to the off/open-circuit condition will not
disconnect the array from ground, as it only disconnects the DC
positive.
18
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