SECTION 3
INSTALLATION AND INITIAL TURN-ON
PV-225208 Photovoltaic Inverter
Operation and Maintenance Manual
Copyright 2003, Xantrex Technology Inc.
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.
