1MRS750915-MUM
REM 54_
89
Machine Terminal
Technical Reference Manual, General
5.2.6. Terminal connections
All external circuits are connected to the terminal blocks on the rear panel. Terminal
block X1.1 for the measuring transformers consists of fixed screw terminals
fastened to the energizing input module. Each terminal is dimensioned for one max.
6 mm
2
or two max. 2.5 mm
2
wires.
ABB sensors (Rogowski coil or voltage divider) are connected to the connectors
X2.1...X2.9. A special type of shielded twin BNC connector (type AMP 332225 or
Amphenol 31-224) is used to improve reliability and protection against
disturbances. The current and/or voltage sensor used must have a connector that is
compatible with the machine terminal. If the machine terminal is ordered without
sensor inputs, the sensor connectors X2.1...X2.9 are missing. Short-circuit
connectors (1MRS120515) must be connected to unused sensor inputs.
The serial interface RS-232 on the rear panel (connector X3.2) is used for
connecting REM 54_ to the SPA bus or the Modbus. The SPA bus is connected to
the X3.2 via a connection module RER 123 and a cable with a 9-pin D-type
subminiature female connector at both ends. The other end of the cable is screwed
to the rear panel (X3.2) and the other end to the RER 123, which is screwed to the
rear side of the relay by using a mounting plate. The cable and the plate are included
in the delivery of the RER 123 (ordering number: 1MRS090715).
The Modbus is connected to the X3.2 via a dedicated cable (see Table 5.2.1-11 on
page 84) with a 9-pin D-type subminiature female connector and a third-party fully
isolated RS-232/RS-485 converter. The other end of the cable is screwed to the rear
panel (X3.2) and the other end to the RS-232/RS-485 converter, which is mounted
to the DIN rail. The cable is included in the delivery of REM 543 with Modbus
protocol.
The serial interface RS-485 on the rear panel (connector X3.3) is used for
connecting the machine terminal to the SPA bus or the LON bus. The SPA/LON bus
is connected via the connection module type RER 103 fitted to the 9-pin D-type
subminiature female connector and screwed to the rear panel.
The connectors X4.1...X7.2 are 18-pin detachable multi-pole connector strips with
screw terminals. The male part of the multi-pole connector strips is fastened to the
printed circuit boards. The female parts, including accessories, are delivered
together with the machine terminal. The female connector part can be secured with
fixing accessories and screws. One max. 1.5 mm
2
wire or two max. 0.75 mm
2
wires
can be connected to one screw terminal.
The digital inputs and outputs (contacts) of the machine terminal are connected to
the multi-pole connectors X4.1...X7.2. The auxiliary power supply is connected to
the terminals X4.1:1 (plus polarity) and X4.1:2 (minus polarity). When the RTD/
analog module is used, the inputs and outputs are connected to the terminals X6.1:1
and X6.1:2. The machine terminal self-supervision output IRF is linked to the
terminals X4.1:3, X4.1:4 and X4.1:5.
Protective earth is connected to the screw marked with the earth symbol.
The connectors are designated according to the module slot in the REM 54_
machine terminal.
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