The Help Key; Numerical Setpoints - GE Multilin 489 Instruction Manual

1.3.2

The HELP Key

1.3.3

Numerical Setpoints

1–10
Courtesy of NationalSwitchgear.com
A front panel command can disable setpoint access once all modifications are complete.
For the communications ports, writing an invalid passcode into the register previously
used to enable setpoint access disables access. In addition, setpoint access is
automatically disabled on an interface if no activity is detected for thirty minutes.
The EnerVista 489 Setup software incorporates a facility for programming the relay
passcode as well as enabling and disabling setpoint access. For example, when an
attempt is made to modify a setpoint but access is restricted, the software will prompt the
user to enter the passcode and send it to the relay before the setpoint is actually written to
the relay. If a SCADA system is used for relay programming, it is the programmer's
responsibility to incorporate appropriate security for the application.
Pressing the key displays context-sensitive information about setpoints such as the
HELP
range of values and the method of changing the setpoint. Help messages will
automatically scroll through all messages currently appropriate.
Each numerical setpoint has its own minimum, maximum, and step value. These
parameters define the acceptable setpoint value range. Two methods of editing and
storing a numerical setpoint value are available.
The first method uses the 489 numeric keypad in the same way as any electronic
calculator. A number is entered one digit at a time with the 0 to 9 and decimal keys. The
left-most digit is entered first and the right-most digit is entered last. Pressing
before the key returns the original value to the display.
ENTER
The second method uses the
value, up to a maximum allowed value. Likewise, the
displayed value by the step value, down to a minimum value. For example:
Select the
TIMEOUT
Press the 1, 2, and 0 keys. The display message will change as shown.
Until the key is pressed, editing changes are not registered by the relay.
ENTER
Therefore,
Press the
The following message will momentarily appear as confirmation of the
storing process.
key to increment the displayed value by the step
VALUE
VALUE
S1 489 SETUP PREFERENCES
setpoint message.
DEFAULT MESSAGE
TIMEOUT: 300 s
DEFAULT MESSAGE
TIMEOUT: 120 s
key to store the new value in memory.
ENTER
NEW SETPOINT HAS
BEEN STORED
489 GENERATOR MANAGEMENT RELAY – INSTRUCTION MANUAL
CHAPTER 1: GETTING STARTED
ESCAPE
key decrements the
DEFAULT MESSAGE