Analog Outputs; Display Panel; Serial Communication - ABB RET 541 Product Manual

Display panel

Serial commu-
nication
Transformer Terminal
• SO: Signal output, either NO (Normally
Open) or NO/NC (Normally Open/Nor-
mally Closed) contact. The output contact
is a normal-duty contact and cannot be
used for controlling a heavy load such as a
circuit breaker.

Analog outputs

The RET 541 and RET 543 transformer ter-
minals equipped with an RTD/analog module
have four general purpose 0...20 mA analog
current outputs. All outputs are galvanically
isolated from the supply and enclosure of the
transformer terminal and from each other.
Analog outputs can be utilized for transfer-
ring any measured or calculated information
to panel meters or e.g. PLCs.
Alarm LED indicators
The transformer terminal offers eight alarm
LED indicators to be configured with the
Relay Mimic Editor. The LED colours (green,
yellow, red), their use, and the ON and OFF
state texts can be freely defined. Three basic
The transformer terminal is provided with
either a fixed display or an external display
module. The external display module requires
a separate voltage supply from a common
source with the main unit. The display con-
sists of 19 rows divided into two windows: a
main window (17 rows) and an assisting win-
dow (2 rows).
The graphic display presents detailed infor-
mation on MIMIC, objects, events, measure-
ments, control alarms, and parameters. The
assisting window is used for terminal-depen-
dent indications/alarms and help messages.
Additionally, the panel includes the following
HMI items:
• three push-buttons for object control (I, O,
object selection)
The transformer terminal has three serial
communication ports, one on the front panel
and two on the rear panel.
The standard optical ABB connector
The standard optical ABB connector (RS-232
connection) on the front panel is intended for
the connection of a PC for configuring the
transformer terminal with the CAP 50_ tools.
The front interface uses the SPA bus protocol.
RET 541, RET 543, RET 545
operation modes are supported: non-latched,
latched-steady and latched flashflashing.
Alarms can be acknowledged remotely,
locally or by using logic of the transformer
terminal.
The alarm channels include time tagging for
detected alarms. The time tagging principle
used depends on the operation mode.
Interlocking LED indicator
The interlocking LED indicates that control
operation has been interlocked or that the
interlocking is in bybass mode, e.g. when
control is possible despite of interlocking.
Trip Circuit Supervision
The purpose of this function is to supervise
the tripping circuitry of the circuit breaker.
An alarm will be generated in case a faulty
tripping circuit, e.g. a circuit is not able to
perform a trip, is detected.
The supervision is based on the constant-cur-
rent injection through the tripping circuitry.
• eight freely programmable alarm LEDs
with different colours and modes accord-
ing to the configuration
• LED indicator for control interlocking
• three protection LED indicators
• HMI push-button section with four arrow
buttons and buttons for clear and enter
• optically isolated serial communication
port
• backlight and contrast control
• freely programmable button (F) which can
be used in the configuration of the trans-
former terminal
• a button for remote/local control
HMI has two main levels, the user level and
the technical level. The user level is for
"everyday" measurements and monitoring
whereas the technical level is intended for
advanced transformer terminal programming.
Unauthorized access can be prevented with
passwords.
SPA/IEC_103/DNP 3.0/Modbus communi-
cation on the rear connector X3.2
The 9-pin D-type subminiature male connec-
tor (RS-232 connection) on the rear panel
connects the transformer terminal to the dis-
tribution automation system via the SPA bus,
IEC_103, DNP 3.0 or Modbus. The fibre-
optic interface module type RER 123 is used
to connect the transformer terminal to the
fibre-optic communication bus for SPA and
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