Changing Setpoints; Description; Installing The Setpoint Access Jumper; Numerical Setpoints - GE 745 TRANSFORMER MANAGEMENT RELAY Instruction Manual

2 GETTING STARTED

2.2 CHANGING SETPOINTS

There are several different classes of setpoints, distinguished by the way their values are displayed and edited.
This section 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.
Each numerical setpoint has its own minimum, maximum, and increment value associated with it. These
parameters define what values are acceptable for a setpoint.
NOMINAL VT SECONDARY
VOLTAGE: 120.0 V
S MINIMUM: 60.0
S MAXIMUM: 120.0
S IN STEPS OF:
S 0.1
S PRESS (0)-(9) OR
S VALUE
SS PRESS [ENTER] TO
SS STORE NEW VALUE
S END OF PAGE S1
S
Two methods of editing and storing a numerical setpoint value are available.
1. 0 to 9 and the decimal key: The relay numeric keypad works the same as that of any electronic calculator.
A number is entered one digit at a time. The leftmost digit is entered first and the rightmost digit is entered
last. Pressing the
ES CA P E
2. and
V AL U E V AL U E
maximum value allowed. While at the maximum value, pressing the
selection to continue from the minimum value. The
step value, down to the minimum value. Again, continuing to press the
value will continue setpoint selection from the maximum value.
GE Power Management

2.2.2 INSTALLING THE SETPOINT ACCESS JUMPER

Select the S2 SYSTEM SETUP / VOLTAGE INPUT / NOMINAL VT SECONDARY VOLTAGE
setpoint message
Press . The following context sensitive flash messages will sequentially
H E LP
appear for several seconds each. For the case of a numerical setpoint
message, the key displays the minimum, maximum, and step value.
H E LP
key, before the key, returns the original value to the display.
E N TE R
: The key increments the displayed value, by the step value, up to the
V AL U E
745 Transformer Management Relay
2.2 CHANGING SETPOINTS

2.2.3 NUMERICAL SETPOINTS

key again will allow setpoint
V ALU E
key decrements the displayed value, by the
V ALU E
V ALU E

2.2.1 DESCRIPTION

key while at the minimum
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