Interconnection Wiring - Xantrex PV-45208 Operation And Maintenance Manual

45 kw grid-tied photovoltaic inverter

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Table Of Contents

Table of Contents

SECTION 3

INSTALLATION AND INITIAL TURN-ON

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).

CAUTION

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.

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.