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ARC FAULT DETECTION UNIT
EN
USER INSTRUCTIONS
Intended use
The Arc Fault Detection Unit (ADU) is especially developed as detection device for direct current (DC)
photovoltaic installations. The ADU is made to detect arc faults within the range from 100Vdc - 1A to
1000Vdc - 40A (according to the UL1699B). The ADU is connected in the positive or negative pole of
the solar cabling. The unit may be installed anywhere in the installation but is preferably installed in a
easily accessible location near the inverter.
The Arc Fault Detection Unit will monitor the current flow on string level and in case of an arc fault
will signal this through the fault LED, the buzzer and the alarm output connector. The alarm output
connector can be used to activate external alarms/actuators for correct follow up of the arc fault
detection. When the fault is resolved, the fault situation can be reset by pressing the reset button and
the ADU will resume monitoring.
The protection degree of the ADU is limited to IP20/NEMA1. The unit needs to be protected against
external influences, therefore the unit must be placed in a separate enclosure with the desired
protection degree, or installed indoors.
Operation instructions
Powering up:
After switching on power, the Arc fault detection unit will start up with a self testing (small beep)
and the green LED (Power) will be blinking. After finishing the self test the green LED will be on
continuously.
Normal operation:
The arc fault detection unit will monitor the current flow and analyze the signal measured to determine
if there is an arc fault situation. It will do this continuously until an arc fault occurs and/or the DC
power supply is removed.
Arc fault situation:
In case an arc fault is detected the ADU will signal this with a blinking red LED (fault). At the same
time a buzzer will sound with for 30 seconds, after 30 seconds the buzzer will only sound once a
minute. Also the alarm output will change state.
!! MAKE SURE THAT THE ROOT CAUSE FOR THE ARC IS RESOLVED !!
The arc fault situation can be resolved by briefly pressing the reset button with a small pin (soft reset).
Fault situation:
In case an error occurs or if the self test fails, the unit will indicate this with the blinking red and green
LED's, also the buzzer will sound and the relay output will change state. This fault situation can be
resolved by pressing the reset button for longer than 5 seconds with a small pin (hard reset) or by
removing and applying the power. If the fault situation keeps occurring please contact Santon for
more information: support@santonswitchgear.com
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