Xantrex Technology PV-225208 important safety instructions Torque and Wire Gauge Specifications

SECTION 3

INSTALLATION AND INITIAL TURN-ON

ISOLATION TRANSFORMER REQUIREMENTS

The PV-225208 UL1741 certification requires the use of a Xantrex Technology specified 225 kVA WYE/ WYE isolation transformer between the inverter AC output and the utility interconnection (See Appendix in Section 7 for transformer dimensions and specifications. This custom 225 kVA isolation transformer is not part of the 225 kVA inverter, but can be ordered as a separate item. If maintaining the listing to UL1741 is not a requirement for your application, contact Xantrex Technology for a fact sheet describing the installation op- tions and precautions for installing this inverter in a photovoltaic system that does not require UL1741 compli- ance.

WARNING

Xantrex Technology requires installing an isolation transformer between the PV- 225208 inverter and the point of utility interconnection. Failure to do so could result in catastrophic damage to the PV-225208 as well as the utility distribution system and will void the product warranty.

Inverter Side Isolation Transformer Requirements

The inverter side of the isolation transformer is configured as a WYE, and is rated for 208 VAC. The neutral (X0) connection on the inverter side must be left floating. If the neutral is tied to ground, the inverter will be damaged internally at power-up.

Utility Side Isolation Transformer Requirements

The utility side windings of the isolation transformer are configured WYE, and must match the voltage at the utility inter-tie. Verify that the transformer supplied matches the voltage requirement. Also, the transformer is supplied with a neutral connection on the utility side. Connection of this utility-side neutral does not affect the operation of the inverter. Check local jurisdiction for their requirements regarding the connection of this neutral.

Contact your Xantrex Technology distributor if you have any questions regarding isolation transformer requirements.

TORQUE AND WIRE GAUGE SPECIFICATIONS

The following torque specifications are to be used on all electrical interfaces made during installation of the PV-225208.

Torque Table

Terminal Block or Bolt Size	Torque Setting
3/8-16 Bolt (AC)	250 in lbs./28.2 Nm
Terminal Block (DC+, DC-,	275 in lbs/31.1 Nm
& DC Neutral)

DOCUMENT: 151811 PV-225208 Photovoltaic Inverter 3-1

Operation and Maintenance Manual

Copyright 2003, Xantrex Technology Inc.