Enphase IQ System Controller 2 Wiring

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Installer Memo - North America

Wiring The Rapid Shutdown Switch to IQ System Controller 2

Overview

The Enphase rapid shutdown switch/Enphase system shutdown switch (EP200G-NA-02-

RSD) provides Rapid Shutdown (RSD) capability, as required by NEC standard, for IQ8

Microinverters when used with IQ System Controller 2 (EP200G101-M240US01). The Rapid

Shutdown Switch and IQ System Controller 2 are certified to the UL1741 Photovoltaic Rapid

Shutdown Equipment (PVRSE) requirement.

This special bulletin includes instructions to enable installers to avoid issues with the rapid

shutdown switch wiring and installation. The bulletin covers:

1. When to use the RSD switch with IQ System Controller 2 (EP200G101-M240US01)?

The RSD switch is required and must only be used for IQ8 microinverters. Refer to page 2 of

this bulletin on how to use IQ System Controller 2 with legacy microinverters (IQ6/7 or

M215/250)

2. How to safely wire the RSD switch to the IQ System Controller 2?

Installers MUST ensure that the IQ System Controller 2 is powered off before performing any

wiring. Wiring an energized IQ System Controller 2 is a safety hazard. If the RSD terminals

are inadvertently connected to any other conductive surface while the IQ System Controller 2

is energized the IQ System Controller 2 can be damaged and will require replacement.

Installers must follow the wiring scheme as described in this document. The wiring scheme for

the Rapid Shutdown Switch depicted in the installation guide is incorrect for a small number

of IQ System Controller 2 units manufactured prior to December 8, 2021. Incorrect wiring

prevents IQ System Controller 2 from exiting the rapid shutdown state and from being

commissioned correctly. The installation guides with incorrect wiring scheme have a revision

of 140-00236-02 or lower.

It is recommended that installers remove the terminal block from System Controller before

wiring the jumpers/ cable headers.

3. How to energize IQ System Controller 2 and exit Rapid Shutdown?

Installer must keep the Rapid Shutdown (RSD) switch turned off before energizing the IQ

System Controller 2. If the RSD switch is turned on before energizing the IQ System Controller

2, the IQ System Controller 2 goes into manual override mode, which forces installers to follow

the process to remove the IQ System Controller from manual override mode and leads to

delays during commissioning.

Summary of content (5 pages)

PAGE 1
Installer Memo - North America Wiring The Rapid Shutdown Switch to IQ System Controller 2 Overview The Enphase rapid shutdown switch/Enphase system shutdown switch (EP200G-NA-02RSD) provides Rapid Shutdown (RSD) capability, as required by NEC standard, for IQ8 Microinverters when used with IQ System Controller 2 (EP200G101-M240US01). The Rapid Shutdown Switch and IQ System Controller 2 are certified to the UL1741 Photovoltaic Rapid Shutdown Equipment (PVRSE) requirement.
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Installer Memo - North America 4. How to verify the Rapid Shutdown (RSD) switch installation and functionality? Page 5 of this document provides the procedure to verify RSD switch installation and functionality. 5. When to use the RSD switch with IQ System Controller 2? The RSD switch is required and must only be used for IQ8 microinverters. For systems with grid tied PV i.e., IQ6/7 or M215/250 microinverters, installers must not use the Rapid shutdown switch.
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Installer Memo - North America The cable header assembly will look like below and it can be found in the System Controller LITKIT (or accessory bag). 6. How to safely wire the RSD switch to the IQ System Controller 2? The Rapid shutdown terminals in IQ System Controller 2 (NC3 and NC4) carry a high voltage. Installers MUST ensure that the IQ System Controller 2 is powered off before performing any wiring.
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Installer Memo - North America 7. How to energize IQ System Controller 2 and exit Rapid Shutdown? The Rapid Shutdown (RSD) switch must be wired BEFORE ENERGIZING the IQ System Controller 2. Upon completing the wiring of the switch using the correct wiring instructions, the RSD switch must be kept in OFF position as shown below, before the IQ System Controller 2 is Energized.
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Installer Memo - North America • If the voltage across the pins is ~0 Vdc then the switch is NOT wired correctly. Fix the wiring per instructions here. • If the voltage across the pins is ~3.3 Vdc then the switch is wired correctly. 3. Ensure you turn the Rapid Shutdown Switch back ON. Annexure 1: Instructions to discharge the IQ System Controller 2 a) b) c) d) e) f) g) Turn DC switches in IQ Batteries to off (if Battery is installed) Open IQ Battery breaker in IQ System Controller.