Introduction
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AC and DC Disconnect Switches

Both AC and DC interface enclosures are equipped with locko ut hasps for
personnel safety. The enclosure doors should not be opened while the PV225S is
operating.
The switch handles and shafts provide a door interlock for both the AC and DC
interface enclosures. The doors cannot be opened when the s witch is in the ON
position.
The DC Disconnect Switch (S2) is equipped with an auxiliary co ntact block
which enables the switch to be used as a load break DC disc onnect. In the event
the DC Disconnect Switch is opened while the PV225S is proce ssing power from
the PV array, the early-break contact block will signal the CCU2 (Converter
Control Unit 2) to stop processing power prior to o pening the DC Disconnect
Switch.
Additionally, opening the DC Disconnect Switch will cause the PV225S to
execute an immediate orderly shutdown, open bo th the main AC and DC
contactors, and report a PV disconnect fault on the LCD of the UFCU.
Communication Features
The PV225S provides two types of information to t he user:
• system status and/or fault informa tion, and
• data logging information.
System status and fault information can be a ccessed using the Universal Front
Panel Control Unit (UFCU) or a personal computer (PC) using t he Xantrex Solar
Graphic User Interface (GUI) software. Data logging requires the use of a PC
using the GUI software.
Figure 1-8
AC and DC Disconnect Switches
AC Disconnect
Switch (S1)
DC Disconnect
Switch (S2)
AC Interface Enclosure DC Interface Enclosure