SMA MLX Series - Manual (Page 19)

5. Fasten cables with cable ties to ensure a durable
connection over time. See Illustration 2.22.
Illustration 2.21 Run Cables Through Cable Glands
Illustration 2.22 Fasten with Cable Ties
2.9 PV Connection
2.9.1 External String Combiners
PV strings must be connected to the DC input via an
external string combiner. The purpose of the string
combiner is to combine the PV strings from the PV array
and secure the individual strings against overcurrent.
NOTICE
It is essential that all PV strings connected to the DC
combiner are even in number and type of modules and
tilt and orientation.
NOTICE
Observe correct fuse rating. Consult module manufac-
turers' manuals for information on correct string fuse
rating.
Use a suitable voltmeter that can measure up to 1000 V
DC. Verify the polarity and maximum voltage of the PV
arrays by measuring the PV open-circuit voltage. The
inverter is protected against reversed polarity and will not
generate power until the polarity is correct.
The combined output from the DC combiner must be
connected to the DC input of the MLX inverter.
CAUTION
PV array is floating, with both the (+) and (-) conductors
connected to the inverters' PV inputs. Neither conductor
is to be connected to earth.
A DC load switch on either the DC combiner or inverter
(optional) for safe disconnect of DC power to inverter is
required.
CAUTION
Do NOT connect PV to earth!
Illustration 2.23 Do Not Connect PV to Earth
Installation
18 L00410644-01_2q / Rev. date: 2014-06-02
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