900-0184-01-00 Rev A
19
Troubleshooting
LED Indicators
Table 3
LED Table
Box LED
When
Lit
Notes
RSI
SOLAR ON
(green)
DC voltage present in system,
Rapid Shutdown switch ON.
May be lit at the same time as
AFCI
.
Despite the label,
SOLAR ON
does not indicate that the PV
system is active. It will illuminate even if PV is completely
disconnected or if an arc fault is present. The name indicates
to responders that this control does not shut down other parts
of the electrical system; i.e. it only affects PV-related devices.
RSI
SOLAR OFF
(red)
System is in “safe” mode.
Rapid Shutdown switch OFF.
This LED can also illuminate
when PV and relay-trip
breakers are disconnected.
This indicator should never be lit at the same time as
any other.
RSI
AFCI
(red)
Arc fault condition or
deliberate arc fault self-test.
Accompanied by at least one
AFCI Annunciator
(on one or
more combiners). May be lit at the same time as
SOLAR ON
.
Combiner
AFCI
Annunciator
(red)
Arc fault condition or
deliberate arc fault self-test.
Accompanied by
AFCI
on RSI. Will not be accompanied by
AFCI Annunciator
s in other combiners unless other arc faults
are present. May be lit at the same time as
SOLAR ON
.
Basic Troubleshooting
The following table describes known situations which can cause unexpected behavior in the ICS Plus.
The table also describes all known situations which will cause the LED indicators to light.
NOTE:
When a true arc fault event occurs, the ICS Plus disconnects the PV by design. ICS Plus
troubleshooting is not required. However, it may be necessary to troubleshoot and
locate the cause of the problem. Diagnosis of an arc fault is not covered under the
scope of this document.
WARNING: Shock Hazard
An arc fault causes the AFCI to disconnect that section of the PV system to prevent fire
or shock injuries. These hazards may still exist on the array itself if physical
troubleshooting is required. Make certain to cover the PV modules and take any other
necessary steps to reduce risk.
See the next page for a table of basic troubleshooting steps.
