Introduction 19
Terms and abbreviations
Term/Abbreviation Explanation
ASL Above sea level
AC500 ABB programmable logic controller (PLC) series
ACS-AP-I Control panel type
Aux. Auxiliary
BAMU Auxiliary measuring unit
BCU Control unit
CPU Central processing unit
DC input Connection point from solar array to inverter. One input consists of one positive and
one negative terminal.
EMC Electromagnetic compatibility
FENA Optional Ethernet adapter module for EtherNet/IP, Modbus TCP and PROFINET IO
protocols.
Frame (size) Size code of inverter power module. In PVS980, the size is R35i.
FSCA Optional Modbus RTU adapter module
IGBT Insulated gate bipolar transistor; a voltage-controlled semiconductor type widely used
in inverters due to its easy controllability and high switching frequency.
Inverter A cabinet-built device containing all inverter modules together with their control
electronics, and I/O and auxiliary components. The inverter module converts the DC
voltage to AC voltage. Its operation is controlled by switching the IGBTs.
I/O Input/Output
MGND Solar array functional grounding unit
MIRU Solar array insulation resistance measuring unit
MPPT Maximum power point tracking. Inverter software function that automatically operates
the photovoltaic generator at its maximum power point.
Photovoltaic cell,
generator, module,
string, array and array
junction box
In this manual, solar power system components based on photovoltaic effect are
called solar cell, solar module, solar array, solar string and solar array junction box as
defined below.
PLC Programmable logic controller
PSL2 Protocol used in optical fiber communication inside ABB drives and inverters
PV Photovoltaic
R35i Inverter power module frame size used in PVS980
RCD Residual-current device
SCADA Supervisory control and data acquisition
Solar array Group of parallel-connected solar strings
Solar array junction
box
Device that connects outputs of multiple solar source circuits (strings) into a combined
output circuit or circuits
Solar cell Device that converts light directly into electricity by the photovoltaic effect
Solar generator
The total of all solar strings of a solar power supply system, which are electrically
interconnected
Solar module
Packaged interconnected assembly of solar cells
Solar string Circuit of series-connected solar modules
THD Total harmonic distortion
WMIB Power module interface board
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