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Electrical Diagrams and Schematics
152315 Rev C 2–5
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.
Electrical Diagrams and Schematics
Since installations vary widely, a sample electrical diagram of the PV100S is
provided in Figure A-1 on page A–3. This diagram is to be used for system
planning purposes only.
For more detailed information, refer to the schematic illustrations for
model-specific electrical schematics.
Model PV100S-480:
• Figure A-2, “PV100S-480 Schematic for Main Power
Distribution (152316 E1)” on page A–4
• Figure A-3, “PV100S-480 Schematic for Control Power
Distribution (152316 E2)” on page A–5
• Figure A-4, “PV100S-480 Schematic for Converter Control
Unit (152316 E3)” on page A–6
Model PV100S-208:
• Figure A-5, “PV100S-208 Schematic Main Power Distribution (152376 C1)”
on page A–7
• Figure A-6, “PV100S-208 Schematic for Control Power
Distribution (152376 C2)” on page A–8
• Figure A-7, “PV100S-208 Schematic for Converter Control
Unit (152376 C3)” on page A–9
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.