SECTION 3
INSTALLATION AND INITIAL TURN-ON
PV-45208 Photovoltaic Inverter
Operation and Maintenance Manual
Copyright 2002, Xantrex Technology Inc.
DOCUMENT: 151710
3-4
Array Grounding
NEC 690-41/42 requires the PV array be earth grounded. The PV-45208 is shipped with a ground
bond for installation between the PV negative terminal block to the PV safety ground terminal block.
The PV-45208 chassis is also bonded to the PV safety ground terminal block. This ground bond is
clearly marked with a warning label which must be read before installation.
For floating PV array
configurations, the factory installed PV negative ground bond must not be installed.
Installation
of this ground bond will cause irreparable damage to the PV-45208. For bipolar PV array configura-
tions, the installer must move the ground bond between the PV array midpoint and the safety ground
terminal block. Refer to the system schematic in the appendix for further wiring configuration.
Ground Fault Detection
The PV-45208 is equipped with a ground fault detec-
tion 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 amps ground fault, the PV-45208 will
execute an orderly shutdown and annunciates a ground
fault at the operator interface. The PV-45208 will
remain faulted until the ground fault is remedied and
cleared at the operator interface (see section 5, Trouble-
shooting).
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 Elec-
trical Code, ANSI/NFPA 70, is the responsibility of the
installer.
CAUTION
CT1
CT1
To reduce the risk of fire, connect only to a circuit provided with 150 amperes
@208VAC, or 75 amperes @480VAC maximum branch circuit overcurrent pro-
tection in accordance with the National Electrical Code, ANSI/NFPA 70.
CAUTION
INTERCONNECTION WIRING
Phase-Sequencing
The PV-45208 is equipped with an automatic sequence-phase-detection control algorithm. This
allows the utility interface conductors to be connected in any sequence convenient at the time of
installation. Upon system initialization at power-up, the PV-45208 determines the phase sequence of
the utility connection and configures the modulator drivers accordingly.
