FlexMax FM100 AFCI Installation

Installation
900-0253-01-00 Rev A 21
Arc Fault Circuit Interruption
The FLEXmax 100 has a circuit card that provides arc fault detection. This device orders the controller to
shut down if arcing occurs in the PV circuit. The card operates automatically as long as the controller
receives battery power.
Figure 13 Arc Fault Sensing Components
The AFCI function requires the PV wires to pass through the sensing coil. The AFCI function performs
optimally with positive and negative wires inserted in opposite directions through the coil. If only one wire
fits, it should be the non-grounded conductor.
When adequate PV power is available, the arc fault card will perform a self-test. A successful self-test will
result in the unit continuing PV production. A failure will result in an arc fault being indicated. This means
that a true arc fault and a self-test failure for other reasons will result in the same display.
Arc faults are displayed in several ways.

The FM100 will display a flashing red
F
AULT
indicator. See page 30.

The MATE3s system display will display
Y
(yes) next to the
Arc Fault
field on the
Charge Controller Error
screen. See page 38. The red
Event
indicator will also illuminate.

If the system is in communication with the OPTICS RE website, OPTICS RE will also indicate an arc fault.
See the Troubleshooting section on page 58 if this occurs.
NOTE:
 If neither wire passes through the coil, the system will not be able to detect
arc fault conditions.
 The arc fault card is not compatible with older charge controllers.
Arc Fault Card
Sensing Coil