Xantrex Technology PV-225208 INTERCONNECTION WIRING, CAUTION

SECTION 3

INSTALLATION AND INITIAL TURN-ON

PV-225208 Photovoltaic Inverter

Operation and Maintenance Manual

DOCUMENT: 151811 3-4

Ground Fault Detection

The PV-225208 is equipped with a ground fault detection circuit

and current transducer (CT1 in illustration). This circuit is active

when the PV array is grounded as described in the previous

section. In the event of a greater than 10 amp ground fault, the

PV-225208 will execute an orderly shutdown and annunciates a

ground fault at the operator interface. The PV-225208 will remain

faulted until the ground fault is remedied and cleared at the opera-

tor interface (see section 5, Troubleshooting).

CT1

The input and output circuits are isolated from the

enclosure and the system grounding, if required by sec-

tions 690-41, 690-42 and 690-43 of the National Electric

Code, ANSI/NFPA 70, is the responsibility of the in-

staller.

CAUTION

To reduce the risk of fire, connect only to a circuit provided with 800 amperes

@208VAC, or 400 amperes @480VAC maximum branch circuit overcurrent protec-

tion in accordance with the National Electrical Code, ANSI/NFPA 70.

CAUTION

INTERCONNECTION WIRING CAUTION

When connecting external AC wires to the PV-225208, positive phasing sequence

must be maintained throughout the installation process. Refer to the System Sche-

matic in Section 7 of this manual for proper phasing convention.

The following wires for connecting the PV-225208 to external devices are not provided by Xantrex Technolo-

gy: (See installation diagram on pages 3-5.)

•Connect 3-Phase 208 VAC inverter output (AC Disconnect switch) to terminals of the 208 VAC

inverter side of isolation transformer. The neutral on the inverter side of the isolation transformer

must be left floating. Ground loops will exist when the inverter starts switching, which will

cause the inverter to shut down due to phase over-currents and will result in damage to the

PV-225208. Also, insure that this neutral is not bonded to the isolation transformer frame. Be

sure to maintain proper phasing as shown in the system schematic found in Section 7.

•Connect Isolation transformer grid side terminals 1, 2, and 3 to line circuit breaker. Be sure to maintain

proper phasing as shown in the system schematic found in Section 7.

•PV frame ground to ground terminal block (TB3).

•Connect PV+, PV-, and PV Safety ground to the DC interface enclosure’s designated termina-

tions. See Section 7 for further detail .

Install all wires listed above. Refer to the Appendix in Section 7 for layout of the AC and DC inter-

face enclosures. Refer to the system schematic in Section 7 for more detailed terminal locations.