Installation manual

Operator Interface Controls
153396 Revision D 1–13
This manual is for use by qualified installers only
AC Disconnect and DC Disconnect Switch
Both enclosure doors of the Xantrex GT250 are equipped with lockout hasps for
personnel safety. The enclosure doors should not be opened while the Xantrex
GT250 is operating.
The switch handles and shafts provide a mechanical door interlock for both the
AC and DC interface sections. The doors cannot be opened when the switches
are in the O
N position.
Although the main O
N/OFF switch (S3) is recommended for an orderly shutdown,
the DC disconnect switch is equipped with an auxiliary contact block which
enables the switch to be used as a load break DC disconnect. In the event the
DC disconnect switch is opened while the Xantrex GT250 is processing power
from the PV array, the early-break contact block will signal the CCU2 (converter
control Unit) to stop processing power prior to opening the DC disconnect
switch.
Additionally, opening the DC disconnect switch will cause the Xantrex GT250 to
execute an immediate orderly shutdown, open both the main AC and DC
contactors, and report a PV disconnect fault on the VFD of the UFCU.
Both Xantrex GT250 enclosure doors must be closed and locked during normal
operation.
WARNING: Risk of electric shock, explosion and arc flash
Disengaging the inverter enclosure door interlock switches does not remove all
hazardous voltages from inside the inverter. Before attempting to service the
Xantrex GT250, follow the procedure for “Lock-out and Tag-out (De-energize/
Isolation Procedure)” on page xiii.