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ABC-170CE
2.0 System Description
2.1 System Block Diagram
The ABC-170CE architecture is shown in the following system block diagram
(Figure 2.1). The AC Inverter connects to the utility via an internally installed
isolation transformer. The DC Converter and AC Inverter transfer power via an
Intermediate DC Bus and communicate via an RS-485 data bus. The DC
Converter also communicates to the ABC-170CE Remote Operation System
(ROS) via an RS-232 data link, or CAN data link depending on system
configuration. The DC Converter provides the DC interface to a load
(or possibly two separate loads) in one of two configurations.
Isolation
Transformer
Utility Interface
Intermediate DC Bus
Figure 2.1. ABC-170CE System Block Diagram
2.1.1 AC Inverter Functions & Controls
The AC Inverter regulates the Intermediate DC Bus based on the
maximum voltage expected by the DC Converter connected. The range
for the Intermediate DC Bus is 350 - 425 Volts DC for 125KW source and
170KW sink. And it can be raised up to 450 Volts DC for 40KW source
and 40KW sink.
Circuitry designed into the AC Inverter monitors the utility to detect any
abnormalities. This is accomplished by measuring the frequency and
amplitude of the utility and verifying that it remains within the specified
range given in the Technical Specifications.
The AC Inverter operates under current control instead of the more
common phase control. This allows for a more robust interface to the
utility and linear response in the inverter dynamics.
In addition, references for the current are obtained from the utility
waveforms, thereby maintaining the AC Inverter as a true unity power
factor interface regardless of line harmonics.
29730-03-04
RS-485
AC
DC
Inverter
Converter
Unit
Unit
Optional Data Collection Systems:
®
SmartGuard
National Instruments NIDAQ
Custom
Page 14 of 61
Installation, Operation, and Maintenance
RS-232
High Voltage Interlock B
Load B
Load A
High Voltage Interlock A
ROS PC
Webasto Charging Systems, Inc.
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