ABB RET 541 Product Manual page 9

Transformer ter-
minal parameter-
ization
Auxiliary
voltage
Terminal
connections
Transformer Terminal
The parameters of the transformer terminal
units can be set either locally over the HMI or
externally via the serial communication using
the Relay Engineering Tools CAP 501/505.
Local parameterization
When the parameters are set locally, the set-
ting parameters can be chosen from the hier-
archical menu structure. The desired
language for parameter description can be
selected.
For its operation, the RET 54_ terminal, in-
cluding the external display module, requires
a secured auxiliary voltage supply. The termi-
nal's internal power supply module forms the
voltages required by the terminal electronics.
The power supply module is a galvanically
isolated (fly-back type) dc/dc converter. A
green protection LED indicator on the front
panel is lit when the power supply module is
in operation.
All external circuits are connected to the ter-
minal blocks on the rear panel, see figures
2...4. The terminal block for the measuring
transformers consists of fixed screw termi-
nals.
The serial interface RS-232 on the rear panel
is used for connecting the transformer termi-
nal to the SPA bus, the IEC_103, DNP 3.0 or
Modbus. The SPA/IEC_103 is connected via
a connection module type RER 123 fitted to
the 9-pin D-type subminiature connector and
screwed to the rear panel. DNP 3.0/Modbus
is connected via a connection module, type
RER 133.
RET 541, RET 543, RET 545
External parameterization
The Relay Setting Tool is used for parameter-
izing and setting the transformer terminals
externally. The parameters can be set off-line
on a PC and downloaded to the transformer
terminal over a communication port. The
menu structure of the setting tool, including
views for parameterization and settings, is the
same as the menu structure of the transformer
terminal.
Power supply modules
There are two basic types of power supply
modules available for the RET 54_: type
PS1/_ and type PS2/_. The operating range of
digital inputs depends on the type of the
power supply module. See Technical data.
The serial interface RS-485 on the rear panel
is used for connecting the transformer termi-
nal to the SPA bus or the LON bus. The
SPA/LON bus is connected via a connection
module type RER 103 fitted to the 9-pin D-
type subminiature connector and screwed to
the rear panel.
The digital input and output contacts of the
transformer terminal are connected to the
multi-pole connectors.
Protective earth is connected to the screw
marked with the earth symbol.
1MRS755543
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