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Installation
3–14 152315 Rev C
inter-tie. The PV100S is a balanced, three-phase, current-sourcing inverter and
only operates with the presence of a stable utility voltage. The transformer is also
supplied with a neutral connection on the utility interconnect. Connection of this
utility-side neutral does not affect the operation of the inverter, however
connection of the neutral on the inverter-side does affect the operation and must
be left floating or disconnected. Single-phase, grounded loads, which may be
present between the transformer and utility, will maintain their existing ground
reference at the utility distribution transformer.
Wiring - Specific
This section provides information for connecting the AC and DC conductors,
ground conductors, and AC Sense Harness.
AC Connections
To connect the main inverter to AC interface/transformer assembly:
1. Remove the access panels from the front of both the Main Inverter Enclosure
and the Transformer Enclosure. Additionally, open the front door to the Main
Inverter Enclosure.
2. Route the AC power conductors A, B, C phase cables and ground conductor
through the conduit between the main inverter to the AC interface/transformer
assembly (T6).
CAUTION: Equipment Damage
If the Isolation Transformer (T6-X0) neutral terminal is tied to ground, it will cause
irreparable damage to the PV100S. Check local regulations for their requirements
regarding the connection of these neutrals.
WARNING: Lethal Voltage
Grounding the neutral of a Wye-wound transformer may create an “open delta” condition,
depending on the utility configuration. This condition may keep the PV100S from
detecting a loss of phase condition on the utility system, which may allow potentially
lethal voltage to be present on the open phase wiring.
Figure 3-12
Route AC Cables through the Conduit
Route the AC cables from the Inverter
Enclosure through the conduit to the
Transformer Enclosure.
Inductor Enclosure
Transformer Enclosure
AC Sense Harness (partially
hidden below AC Cables)