GE Power Management 750/760 Feeder Management Relay 2-
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2 GETTING STARTED 2.2 CHANGING SETPOINTS
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2.2 CHANGING SETPOINTS 2.2.1 DESCRIPTION
There are several different classes of setpoints, each distinguished by the way their values are displayed and
edited. Now that we have become more familiar with maneuvering through messages, we can learn how to edit
the values used by all setpoint classes.
2.2.2 INSTALLING THE SETPOINT ACCESS JUMPER
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 (C10 and C11) on the back of the relay case. Attempts to enter a
new setpoint without this electrical connection will result in an error message.
2.2.3 HELP KEY
Pressing the key will display context sensitive information about setpoints such as the range of values
and the method of changing the setpoint. Help messages will automatically scroll through all messages cur-
rently appropriate.
2.2.4 NUMERICAL SETPOINTS
Each numerical setpoint has its own minimum, maximum, and step value associated with it. These parameters
define what is acceptable for the setpoint. Two methods of editing and storing a numerical setpoint value are
available.
The 750/760 numeric keypad works the same as any electronic calculator. A number is entered one digit at a
time with the 0 to 9 and decimal keys. The leftmost digit is entered first and the rightmost digit is entered last.
Pressing the key before the key returns the original value to the display.
The key increments the displayed value by the step value, up to a maximum allowed and then wraps
around to the minimum value. The key decrements the displayed value by the step value, down to a
minimum value and then wraps around to the maximum value.
2.2.5 ENUMERATION SETPOINTS
Enumeration setpoints have data values which are part of a set whose members are explicitly defined by a
name. A set is comprised of two or more members. Enumeration values are changed using the and
keys.
NOMINAL VT SECONDARY
VOLTAGE: 120.0 V
Move to message
S2 SYSTEM SETUP \ BUS VT SENSING \ NOMINAL VT SECONDARY
VOLTAGE
.
NOMINAL VT SECONDARY
VOLTAGE: 63.9 V
Press the 6, 6, decimal, and 3 keys. The display message will change as
shown.
n
NEW SETPOINT
n
HAS BEEN STORED
Until the key is pressed, editing changes are not registered by the
relay. Therefore, press the key to store the new value in memory.
This flash message will momentarily appear as confirmation of the storing
process. If 69.28 were entered, it would be automatically rounded to 69.3
HELP
ESCAPE ENTER
VALUE
VALUE
ENTER
VALUE
VALUE
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