Neutral And Equipment Ground; Phase Rotation - Eaton Power Xpert Solar 1500 User Manua

Figure 19. Typical Mounting with MV Transformer, continued

Neutral and Equipment Ground

The low voltage connection of the utility-grid transformer is a
3-wire Delta (A, B, C). The inverter's 3-wire system does not
include a neutral and cannot be connected to a neutral.
The ground listed in Table 8 is the equipment grounding
conductor (EGC) between the inverter and transformer.
This EGC is routed separate from the phases in the throat
connection/enclosure.
This means that a grounded (neutral) configuration should
not be used. Only Delta or Wye ungrounded configuration on
low voltage side should be used.
Power Xpert Solar 1500/1670 kW Inverter MN141001EN—October 2014 www.eaton.com

Phase Rotation

The inverter is phase A-B-C sequence sensitive The throat
connection is fixed, such that Phase-A peaks before Phase-B,
and Phase-B peaks before Phase-C. This inverter AC-output
sequence cannot be changed. Therefore, check the utility
phase-sequence and make any adjustments at the medium
voltage side of the transformer or the facility grid-tie point(s).
Pre-determined the grid (PCC) phase rotation to ensure the
proper phase-wiring sequence as part of the installation.
OUTPUT PHASE
ROTATION SEQUENCE
A−B−C
C
A
B
Electrical Connections
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