Changing Setpoints - GE TRANSFORMER MANAGEMENT RELAY 745 Instruction Manual

2.1 USING THE FRONT PANEL DISPLAY
9. To view the remaining setpoints associated with the preferences sub-header, repeatedly press the
last message appears as shown.
DEFAULT MESSAGE
TIMEOUT: 300 s
Let us review how we got to this last message.
2
1. First, we started at the setpoints page header
2. We then moved to the second sub-header message in Page S1, which is
3. We then moved to the last message in this group.
A path can be used as a means of specifying where a message is located in the 745 relay. For this last message, the path
would be
S1 745 SETUP
messages in this manner. Press the
from any of the messages under a sub-header will return the display to that sub-header message. From a sub-header mes-
sage, the repeated pressing of
As an alternative, you could press the
a) DESCRIPTION
There are several different classes of setpoints, distinguished by the way their values are displayed and edited. This sec-
tion describes how to edit the values used by all setpoint classes.
Hardware and passcode security features are designed to provide protection against unauthorized setpoint changes. Since
we will be programming new setpoints using the front panel keys, a hardware jumper must be installed across the setpoint
access terminals (D9 and D10) on the back of the relay case. A keyswitch may also be used across these terminals to
enable setpoint access. Attempts to enter a new setpoint via the front panel without this connection will be unsuccessful.
b) NUMERICAL SETPOINTS
Each numerical setpoint has its own minimum, maximum, and increment value associated with it. These parameters define
what values are acceptable for a setpoint.
1. Select the
S2 SYSTEM SETUP
NOMINAL VT SECONDARY
VOLTAGE: 120.0 V
2. Press . The following context sensitive flash messages will sequentially appear for several seconds each. For
HELP
the case of a numerical setpoint message, the
MINIMUM: 60.0
MAXIMUM: 120.0
IN STEPS OF:
0.1
PRESS (0)-(9) OR
VALUE
PRESS [ENTER] TO
STORE NEW VALUE
END OF PAGE S1
2-2
Courtesy of NationalSwitchgear.com
S1 745 SETUP
PREFERENCES DEFAULT MESSAGE TIMEOUT
key to return to the preferences sub-header message. Pressing the
ESCAPE
moves the display through the list of sub-header messages to the page header.
MESSAGE
key and move directly to the next page.
SETPOINT
VOLTAGE INPUT
HELP
745 Transformer Management Relay
.
PREFERENCES
. For the purposes of this manual, we will refer to
NOMINAL VT SECONDARY VOLTAGE
key displays the minimum, maximum, and step value.
2 GETTING STARTED
key. The
MESSAGE
, and pressed the key.
ENTER
key
ESCAPE

2.1.2 CHANGING SETPOINTS

setpoint.
GE Multilin