YASKAWA SOLECTRIA XGI 1500 Series - Transformer Configuration

Installation and Operation Guide SOLECTRIA XGI 1500 (Rev A, April 2019)
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Transformer Configuration
3.4
Grid Mismatch
If the grid does not match the requirements, the inverter will not start and damage may
occur. Check with your local electric utility before selecting a grid standard.
The system must comply with National Electrical Code ANSI/NFPA 70 and with all local
rules and safety regulations before the inverter can be operated.
The inverter must be connected to an isolation transformer provided by the customer that has a grounded Wye
configuration on the inverter side (see Figure 3-12). The neutral of this transformer must be grounded.
Figure 3-12 Permitted Transformer Configurations
The inverter cannot operate connected to a delta service, corner grounded service, or wye with fully insulated
Neutral. For more information, please refer to Solectria’s application note on this topic:
Interconnection Guidelines for Yaskawa Solectria Solar Transformerless Inverters.
Figure 3-13 Prohibited Transformer Configurations
Improper Transformer Configuration
Inverter will not run and may have hazardous current. Connect transformer in specified
configurations only. Incorrect transformer configuration may cause damage to the inverter.
Wye With Neutral Connection
Wye With
out Neutral
WYE with Floating Ground
Delta
with Floating Ground
Delta
with Corner
Ground