Installation manual

Safety
xii 153396 Revision D
This manual is for use by qualified installers only
Inverter Isolation Transformer
The Xantrex GT250 includes a custom, high-efficiency, isolation transformer. The
utility side windings of the isolation transformer are configured Wye and must
match the voltage at the utility inter-tie. The Xantrex GT250 is a balanced,
three-phase, current-sourcing inverter and only operates with the presence of a
stable utility voltage. The transformer is supplied with a neutral connection on
both the primary and secondary windings. Connection of these neutral terminals
will affect the operation of the Xantrex GT250 and must be left floating or
disconnected. Single-phase, grounded loads which may be present between the
transformer and utility, will maintain their existing ground reference at the utility
distribution transformer.
Operational Safety Procedures
Never work alone when servicing this equipment. A team of two is required until
the equipment is properly de-energized, locked-out and tagged, and verified
de-energized with a meter.
Thoroughly inspect the equipment prior to energizing. Verify that no tools or
equipment have been inadvertently left behind.
CAUTION: Fire Hazard
In accordance with the National Electrical Code, ANSI/NFPA 70, connect only to
a circuit provided with the following maximum branch circuit overcurrent
protection:
• Xantrex GT250 480 and Xantrex GT250 480 PG – 400 A
• Xantrex GT250 600 – 350 A
CAUTION: Equipment Damage
If the Isolation Transformer neutral (H0 and X0) terminals are tied to ground, they
may cause irreparable damage to the Xantrex GT250.