YASKAWA ACS-500 User Manual page 7

ANCHOR HOLE 4X
Figure 2-2 ACS-500 System Components
The customer connects the positive and negative connection of the battery system to the common bus
bars in the DC Bus De-Combiner. The DC Bus De-Combiner connects the DC to the three inverters with
the appropriate fusing. See the Chapter on DC wiring for more details.
The AC Combiner connects the AC output of the three inverters together with the appropriate fusing.
The customer connects the grounded low-voltage side of the MV transformer to bus bars in the AC
combiner. See the Chapter on AC wiring for more details.
The Heila Edge PMC controls the flow of active and reactive power through the three inverters and
monitors the state of charge (SOC) of the battery through MODBUS TCP/IP messaging. The Heila Edge
PMC draws its supply power from a 346V/120V single phase transformer and is protected by a UPS, to
be able to communicate with the ACS-500 system and the battery in case of a power outage. For more
information consult the Heila Edge PMC manual and the Chapter on Communications.
The three Solectria XGI 1500-166/166-3S inverters control the second-to-second conversion of DC power
to AC power and vice-versa. They are connected in a parent-child topology though CAN bus, where the
children follow the parent's set points instantaneously. The system is arranged in a fully redundant
fashion; when one inverter encounters a problem the two others continue operating and take over its
load, until a repair has taken place.
Yaskawa Solectria Solar DOCR-071070 Page 7 of 30