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Transformer TerminalRET 541, RET 543, RET 545

1MRS755543

Transformer ter -

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.
External parameterization

minal parameter -

The Relay Setting Tool is used for parameter -

ization

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.
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.

Auxiliary !

For its operation, the RET 54_ terminal, in- cluding the external display module, requires a secured auxiliary voltage supply. The termi
Power supply modules

voltage

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. - 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.

Terminal !

All external circuits are connected to the ter - The serial interface RS-485 on the rear panel is used for connecting the transformer termi

connections

minal blocks on the rear panel, see figures 2...4. The terminal block for the measuring transformers consists of fixed screw 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. - 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. 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.
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