GE Multilin 489 User Manual

1–10 489 GENERATOR MANAGEMENT RELAY – INSTRUCTION MANUAL
CHAPTER 1: GETTING STARTED
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.
1.3.2 The HELP Key
Pressing the HELP key displays 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 currently appropriate.
1.3.3 Numerical Setpoints
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
ESCAPE
before the
ENTER key returns the original value to the display.
The second method uses the
VALUE S key to increment the displayed value by the step
value, up to a maximum allowed value. Likewise, the
VALUE T key decrements the
displayed value by the step value, down to a minimum value. For example:
Z Select the
S1 489 SETUP ZV PREFERENCES ZV DEFAULT MESSAGE
TIMEOUT setpoint message.
Z Press the 1, 2, and 0 keys. The display message will change as shown.
Until the
ENTER key is pressed, editing changes are not registered by the relay.
Therefore,
Z Press the
ENTER key to store the new value in memory.
The following message will momentarily appear as confirmation of the
storing process.
DEFAULT MESSAGE
TIMEOUT: 300 s
DEFAULT MESSAGE
TIMEOUT: 120 s
NEW SETPOINT HAS
BEEN STORED
Courtesy of NationalSwitchgear.com

GE Multilin 489 Specifications

General

Brand	GE
Model	Multilin 489
Category	Relays
Language	English