Install Manual

Envoy-S Installation and Operation
 2015 Enphase Energy Inc. 141-00027 Rev 01
39
An insulation resistance (IR) sensor in the microinverter measures the resistance between the positive and
negative PV inputs to ground. If either resistance drops below a threshold, the microinverter stops power
production and raises this condition. This may indicate defective module insulation, defective wiring or
connectors, moisture ingress, etc. Although the cause may be temporary, this microinverter condition
persists until the sensor is manually reset.
If a microinverter registers a “DC Resistance Low - Power Off” condition, you can attempt to clear this
condition. An Envoy is required to send the clear-dc-resistance-low message to clear the condition. If the
condition does not clear after you perform the following procedure, contact Enphase Energy customer
support at [e-mail].
There are two ways to send a clear message to the microinverter. Note that the condition will not clear after
sensor reset if the cause of the failure is still present. If the condition persists, contact your installer.
Method 1: Clear this error through Enlighten.
 Access the System in Enlighten.
 Click the Events tab. The next screen lists shows that there is a current “DC Resistance Low -
Power Off” condition for the system.
 Click DC Resistance Low - Power Off.
 Where “n” is the number of affected devices, click n devices (show details).
 Click the serial number of the affected microinverter.
 Click the Reset DC Resistance Low - Power Off Sensor button.
The system displays, “A DC Resistance Low- Power Off reset task was issued on 08/03/2015 01:34
PM CDT for this microinverter and is still pending.”
Method 2: Send the clear message using the Installer Toolkit. On the list of detected microinverters, there is
a green dot or red square to the left of each microinverter serial number. A green dot indicates Status OK. A
red square indicates an event for that microinverter.
 Tap the to the left of the serial number to view details for a microinverter event.
 If the microinverter status shows that there is an active DC Resistance Low – Power Off condition,
tap the to send the clear message to the affected microinverter.
The app then indicates that a clear message was sent.
Clear GFI Tripped Condition
This condition occurs only with the M190, D380, M210, M200, M175 Microinverters and one model of the
M215 Microinverter (M215-60-2LL-S22). A solid red status LED on the microinverter indicates a ground fault
(GFDI) error. The LED will remain red and the fault will continue to be reported by the Envoy until the error
has been cleared.