5–4 745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
OVERVIEW CHAPTER 5: SETPOINTS
5.1.2 Setpoint entry
Prior to commissioning the 745 relay, setpoints defining transformer characteristics,
inputs, output relays, and protection settings must be entered, via one of the following
methods:
• Front panel, using the keypad and display.
• Front panel RS232, rear terminal RS485/RS422, or Ethernet communication ports,
and a portable computer running the EnerVista 745 Setup software or a SCADA
system running user-written software.
Any of these methods can be used to enter the same information. A computer, however,
makes entry much easier. Files can be stored and downloaded for fast, error free entry
when a computer is used. Settings files can be prepared and stored on disk without the
need to connect to a relay.
All setpoint messages are illustrated and described in blocks throughout this chapter. The
745 relay leaves the factory with setpoints programmed to default values, and it is these
values that are shown in all the setpoint message illustrations. Some of these factory
default values can be left unchanged.
There are many 745 setpoints that must be entered for the relay to function correctly. In
order to safeguard against installation when these setpoints have not been entered, the
745 does not allow signaling of any output relay. In addition, the In Service LED is off and
the Self-Test Error LED on until the
S1 745 SETUP INSTALLATION 745 SETPOINTS value
is set to “Programmed”. This setpoint is defaulted to “Not Programmed” when the relay
leaves the factory. The
SETPOINTS HAVE NOT BEEN PROGRAMMED diagnostic message
appears until the 745 is put in the programmed state:
Messages may vary somewhat from those illustrated because of installed options. Also,
some messages associated with disabled features (or optional features which have not
been ordered) are hidden. These messages are shown with a shaded message box.
• Keypad entry: See Using the Relay on page 1–3 for details on maneuvering
through the messages, viewing actual values, and changing setpoints.
• Computer entry: Setpoint values are grouped together on a screen in the
EnerVista 745 Setup software. The data is organized in a system of menus. See
EnerVista Software Interface on page 4–8 for details.
• SCADA entry: Details of the complete communication protocol for reading and
writing setpoints are given in chapters 8 and 9. A programmable SCADA system
connected to the RS485/RS422 terminals can make use of communication
commands for remote setpoint programming, monitoring, and control.
5.1.3 Setpoint Write Access
The 745 design incorporates hardware and passcode security features to provide
protection against unauthorized setpoint changes.
MESSAGE
FACTORY []
SERVICE
See page 5–112
MESSAGE
END OF PAGE S6
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