Chapter 6. Operating The Arc Fault Detection Unit; General Description; Adu Overview; Figure 6-1. Optional Adu Features And Connection Box Components - Advanced Energy AE 3TL 600 Series Installation And Operation Manual

Operating the Arc Fault
Detection Unit

GENERAL DESCRIPTION

The Arc Fault Detection Unit (ADU) is an arc fault detection device designed to
detect series arcs in DC photovoltaic installations. The ADU monitors the current
flow at the string level. The ADU detects a range of arc faults from 100 VDC 1 A to
1000 VDC 40 A. The ADU can detect arcing events over a maximum of 66 meters
upstream or downstream of the installed location.
When an arc fault occurs, the information is provided using the following methods:
• Fault LED lights
• Buzzer provides an audio alarm
• Message Arc fault detected is displayed on the inverter screen
• Inverter stops operation and disconnects from the grid
In addition, the ADU has an alarm output connector for activating external alarms/
actuators for follow-up of the arc fault detection.

ADU Overview

The connection box contains the optional ADU for inverters that provide AFCI
detection.
DC disconnect
Figure 6‑1. Optional ADU features and connection box components
570-1003552-05A
Advanced Energy® AE 3TL Inverters
ADU
LEDs
Reset button
DC inputs
Operating the Arc Fault Detection Unit
AC input
Grounding stud
Chapter
6
6‑1