Installation manual

Safety
153396 Revision D xiii
This manual is for use by qualified installers only
Lock-out and Tag-out (De-energize/Isolation Procedure)
Safety requirements mandate that this equipment not be serviced while
energized. Power sources for the Xantrex GT250 must be locked-out and
tagged-out prior to servicing. A padlock and tag should be installed on each
energy source prior to servicing.
The Xantrex GT250 can be energized from both the AC source and the DC
source. To ensure that the inverter is de-energized prior to servicing, lock out
and tag out the Xantrex GT250 using the following procedure.
1. Turn the Xantrex GT250 main O
N/OFF switch (S3) to the OFF position.
This stops the inverter from exporting power to the AC utility grid.
2. Open, lock out, and tag out the incoming power at the utility main circuit
breaker.
3. Open, lock out, and tag out the AC disconnect (CB1) on the left door of the
Xantrex GT250. See Figure 1-10 on page 1–14 for the location of the AC
disconnect.
4. Open, lock out, and tag out the incoming power at the PV array disconnect (if
installed.) If a PV array disconnect is not installed, see the WARNING below.
5. Open, lock out, and tag out the DC disconnect switch (S1) on the right door
of the Xantrex GT250. See Figure 1-10 on page 1–14 for the location of the
DC disconnect switch.
6. Using a confirmed, accurate meter, verify all power to the inverter is
de-energized, as described in Steps 7 and 8. A confirmed, accurate meter
must be verified on a known voltage before use.
WARNING: Shock hazard
Review the system schematic for the installation to verify that all available energy
sources are de-energized. DC bus voltage may also be present. Once all
sources of input are identified and isolated, allow five minutes for all capacitors
within the main enclosure to completely discharge before proceeding.
WARNING: Shock Hazard
Schneider Electric recommends the installation of PV array disconnect(s) to ensure
personal safety during Xantrex GT250 maintenance. Without PV array disconnect(s),
once the DC disconnect switch (S1) is open, there will still be DC voltage on the DC
terminals TB3, TB4 AND TB5 (PV GND). This voltage may be as high as the open-
circuit voltage of the PV array and is limited to 600 Vdc per NEC 690. Use extreme
care to avoid these terminals if no PV array disconnect is installed.