Manual

39 | P a g e
Arc Fault
The Arc Fault Detector is a unique safety component included in every Classic, because safety is not an
option, the engineers at MidNite take
action as the 2011 NEC code requires.
The Classic is the first charge controller in
the world to successfully stop a series arc.
The Classic can detect an arc in less than
100mSec. From low power arcing to
devastating high power arcing, the Classic
will detect and shut down with an audible
and visible alert to announce that there is
a problem in the PV side of the system.
When an arc is detected the Classic has to
be manually cleared.
Resetting the Arc Fault Detector after
detection has occurred: The First thing to
do is find and fix the actual arcing wire,
terminal, splice etc. The Classic needs to
be powered down completely for 15
seconds and then powered back up. Do this by turning the DC source (PV, Wind or hydro etc.) breaker
off. Then turn off the external battery breaker. Than simply turn the 2 breakers back on starting with the
battery breaker.
The arc fault module has three adjustable parameters consisting of: MODE, TIME & SENSITVY
MODE: Is assigned as a 1 from factory default and it should stay that way unless instructed by MidNite
Solar.
TIME: This sets the length of the arc the Classic has to monitor before tripping the Arc fault detection.
This parameter is set to 4 from the factory.
SENSITIVITY: This parameter determines how sensitive the Arc fault detector will be 1 being the most
sensitive and 15 the least. This parameter is set to 10 from the factory.
If you experience nuisance tripping you can raise the sensitivity one digit at a time. Follow the
instructions below to make adjustments or disable Arc fault. As a last resort, you may disable Arc fault if
your system cannot work with the arc fault detector.
To change the parameters of the Arc Fault, follow the steps below:
 Press Main Menu
 Scroll to the right or left until TWEAKS is highlighted and press ENTER
 In TWEAKS press the right soft key to get to the BITS menu
 In BITS press the right soft key to get to ARC ADJ
 In this menu use the left and right keys to select the feature to adjust
 Use the up and down arrow keys to change the parameters