Connecting the Strings to the Connection Unit with
Safety Switch
You can connect systems with multiple DC strings in parallel to the DC input terminals
of the Connection Unit with Safety Switch. Inverters may have a different number of
pairs of DC input terminals, depending on the inverter power rating. If morestrings are
required, they can be connected in parallel using an external combiner box before
connecting to the Connection Unit with Safety Switch. When connecting multiple
strings, it is recommended to run separate circuits to the Connection Unit with Safety
Switch or to position the combiner box near the Connection Unit with Safety Switch.
This simplifies commissioning by allowing testing and servicing near the inverter.
NOTE
Use 16-6 AWG, 75-90°C copper wires only.
To connect the strings to the Connection Unit with Safety Switch:
1. Equipment grounding: Connect the DC equipment ground conductor to the
equipment grounding terminal block (bus-bar) in the Connection Unit with Safety
Switch.
2. Insert the DC conduit into the DC-side opening on the Connection Unit with Safety
Switch (left side at the bottom of the Connection Unit with Safety Switch).
3.
Connect the DC wires to the DC+ and DC- terminal blocks, according to the labels
on the terminals, connect two wires (DC+ and DC-) per string:
a. Use a standard flat-blade screwdriver to connect the wires to the spring-clamp
terminals. The screwdriver blade should fit freely in the terminal opening. Too
large a blade can crack the plastic housing.
b. Insert the screwdriver and firmly tilt it to press the release mechanism and open
the clamp.
c. Insert the wire into the top opening.
d. Remove the screwdriver – the wire is automatically clamped.
CAUTION!
Ensure that the Plus (+) wire is connected to the + terminal and that the Minus
(-) wire is connected to the Minus (-) terminal connector.
Chapter 4: Connecting the AC and the Strings to the Connection Unit 34
EV Charging Single Phase Inverter MAN-01-00629-1.2
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