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ABC-170
2.0 System Description
2.1 System Block Diagram
The ABC-170 architecture is shown in the following system block diagram (Figure 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-170 Remote Operation (ROS) System 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
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. The bus can be raised to 450
Volts DC for 40KW source and 40KW sink operation.
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.
Figure 2 shows the AC Inverter front panel.
indicators are described below.
11780-03-E
RS-485
AC
Inverter
Unit
Optional Data Collection Systems:
SmartGuard
•
National Instruments NIDAQ
•
Custom
•
Figure 1 ABC-170 System Block Diagram
Page 12 of 52
Installation, Operation & Maintenance
RS-232
High Voltage Interlock B
DC
Load B
Converter
Unit
Load A
High Voltage Interlock A
®
Each of the front panel controls and
Webasto Charging Systems, Inc.
ROS PC
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