Dc Resistance Low - Power Off Condition - enphase IQ8D-72-E-US Design Manual

DC Resistance Low – Power Off Condition
For all IQ Series models, a solid red status LED when DC
power has been cycled indicates the Microinverter has
detected a DC Resistance Low – Power Off event. The LED
will remain red and the fault will continue to be reported by
the Gateway until the error has been cleared.
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, or a similar problem. Although the cause may be
temporary, this Microinverter condition persists until the
sensor is manually reset.
Method 1: Clear this Error Using Enlighten
• Log in to Enlighten and access the system.
• Click the Events tab. The next screen shows 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).
Method 2: Use Installer Toolkit to Clear the Condition
On the list of detected Microinverters, a green dot or red
square appears to the left of each Microinverter serial
number. A green dot indicates Status OK. A red square
indicates an event for that Microinverter.
© 2022 Enphase Energy Inc. All rights reserved.
An IQ8D Commercial Gateway is required to clear this
condition. The condition clears on operator command
unless its cause is still present.
If a Microinverter registers a "DC Resistance Low - Power
Off" condition, you can attempt to clear this condition.
If the condition does not clear after you perform the
following procedure, contact Enphase Energy customer
support at enphase.com/en-us/support/contact
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.
• Click the serial number of the affected Microinverter.
• Click Reset DC Resistance Low - Power Off Sensor.
The system displays, "A DC Resistance Low- Power
Off reset task was issued on [date and time] for this
Microinverter and is still pending."
• 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.
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