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PR512/PD (50-51-50N-51N + DIALOGUE) UNIT
Binary inputs
Inputs for acquiring the circuit-breaker state
By means of these inputs the signals regarding
the state of the circuit-breaker can be acquired. In
particular the following are available:
a) Input to acquire the OPEN circuit-breaker state
b) Input to acquire the CLOSED circuit-breaker
c) Input to acquire the state of the springs
d) Input to acquire the physical position of the
Outputs for controlling the shunt opening
and closing releases
Two relays are integrated in the PR512/PD unit
with normally open contacts through which circuit-
breaker opening and closing can be controlled
remotely.
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Protection and dialogue func-
tions
The PR512/PD (50-51-50N-51N +
dialogue) unit carries out all the
functions of the PR512/P (50-51-
50N-51N) unit as well as also
offering the possibility of remote
control of the circuit-breaker, of its
protection functions and of current
measurement.
To obtain the dialogue function, a 24
V dc (± 20%) auxiliary power supply
must be provided for the PR512/PD.
state
(CHARGED/DISCHARGED)
circuit-breaker (CONNECTED/ISOLATED).
Dialogue function
Dialogue with the centralised system.
The serial interface used complies with the EIA
RS485 Standard and therefore the connections
must be made respecting the rules of this stand-
ard.
For further details, ABB can be asked for the
following documents:
• 401517
Examples of EIA RS485 type serial
communication distribution;
• 601823
Requirements for EIA RS485 type
serial communication cable laying.
The protocol used is ABB INSUM described in
document TN6567.
The EIA RS485 Standard defines a differential
serial, multi-point communication system in
current ring which foresees a Master (central unit)
and up to 32 Slaves (PR512/PD).
Consequently each slave must be found by
means of a distinct address, made available
previously by means of Dip Switches on the front
of the unit.
It is not permitted to have several units with the
same address.
The transmission speed can be programmed from
150 to 19200 Baud (bit/s) by means of the special
Dip Switches.
Unit transmission activity with the centralised
control system is signalled by the TC LED flashing.
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