Xantrex Technology PROsine 2.0 user manual Configuring the Output Neutral Bonding System

Step 5: Configuring the Output Neutral Bonding System

Step 5: Configuring the Output Neutral Bonding System

AC Output Neutral-to-Ground Bonding System

The PROsine provides an installer-defeatable system that automatically connects the neutral conductor of the inverter AC output circuit to safety ground (“bonding” it) during inverter operation, and disconnects it (“un-bonding” it) when the PROsine has connected to AC shorepower. This system is designed to conform to installation codes that require single-phase AC sources such as inverters and generators to have their neutral conductors tied to ground in the same way that the neutral conductor from the utility is tied to ground.

These same codes specify that the neutral can only be connected to ground in one place at any one time. Any AC source feeding the PROsine is required to have its neutral already connected to ground. Therefore, to keep from connecting the neutral to ground in a second place, the PROsine transfer relay breaks its own neutral ground connection when connected to shorepower.

This automatic neutral-to-ground bonding system is suited for installations in which the AC shorepower source is known to have a bonded neutral. This will be the case in most situations: in a utility feed after the AC source panel, at an RV park hook-up, at a marina’s shorepower hook-up, or with a generator with a bonded neutral.

In some installations, however, the AC shorepower source will not have a bonded neutral. This is true on some generators and it is true in certain utility-feed situations. To accommodate these situations, the PROsine automatic neutral bonding system can be defeated, so the PROsine will not bond the neutral in any mode of operation. This allows the installer to bond the neutral in the AC load panel to provide the required single-point bonding of the neutral.

To enable and disable the automatic AC output neutral-to-ground bonding system

WARNING: Fire and Shock hazard

AC neutral bonding system settings should only be changed by a qualified installer aware of the implications of the changes. Disconnect all AC and DC sources before working in the AC wiring compartment or before making a setting change.

You enable and disable the system using a screw in the AC wiring compartment, identified as the “Invert Mode Output Neutral-to-Ground Bonding Screw”. (See Figure 3-3.) This screw is identified with a label that indicates two different holes that the screw can be mounted in. One hole is identified as the one that enables the automatic bonding system, and the other hole defeats it so that the neutral is not bonded by the PROsine in any mode.

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