IQ system Controller 2 Installation

I/O - 1
(24V, 1A)
I/O - 2
(24V, 1A)
Gen - I/O
(24V, 1A)
NO1 NO2 NC1 NC2
NO3
RSD
NC3 NC4
AC Combiner PV/Storage Generator
Line diagram for auxiliary contact connections image shows NO1 is used
to shed excess loads and NO2 is used to shed excess PV. See our technical
brief, Load and Solar Circuit Control using IQ System Controller Auxiliary
Contacts (https://support.enphase.com/s/article/Load-and-Solar-Circuit-Control-using-Enpower-Auxil-
iary-Contacts), for detailed line diagram and other details.
B. Securing Auxiliary Contact to IQ System Controller 2
IQ System Controller 2 is shipped with feed through headers pre-installed on
the terminals.
Follow the below steps to secure the headers to IQ System Controller 2, as
shown in Feed through headers for I/O-1 and I/O-2 image.
1. Insert the wires from the transformer controller and the external
contactor into the feed through header.
NOTE: Supports AWG 28 to AWG 16 wire sizes
2. Tighten the screws on the top (torque 0.22Nm to 0.25Nm) to secure
the wires.
Follow same procedure for generator dry contact connections (There are 3
terminals on the Gen-I/O port as shown in Feed thorugh header for genera-
tor I/O image. Use the rst and third terminal for wiring.)
Auxiliary contacts In IQ System Controller 2
Line diagram for auxiliary contact connections used for shedding excess load and PV.
Feed through headers for I/O-1 and I/O-2
Feed through header for generator I/O
2. Tighten these screws to
hold the wires in place
1. Insert wires here
Insert wires in these
terminals