S12 testing, 1 simulation mode, 13 s12 testing – GE 489 User Manual

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4-78

489 Generator Management Relay

GE Multilin

4.13 S12 TESTING

4 SETPOINTS

4.13S12 TESTING

4.13.1 SIMULATION MODE

PATH: SETPOINTS

ÖØ

S12 TESTING

SIMULATION MODE

The 489 may be placed in several simulation modes. This simulation may be useful for several purposes. First, it may be
used to under-stand the operation of the 489 for learning or training purposes. Second, simulation may be used during star-
tup to verify that control circuitry operates as it should in the event of a trip or alarm. In addition, simulation may be used to
verify that setpoints had been set properly in the event of fault conditions.

The

SIMULATION MODE

setpoint may be entered only if the generator is offline, no current is measured, and there are no

trips or alarms active. The values entered as Pre-Fault Values will be substituted for the measured values in the 489 when
the

SIMULATION MODE

is "Simulate Pre-Fault". The values entered as Fault Values will be substituted for the measured val-

ues in the 489 when the

SIMULATION MODE

is "Simulate Fault". If the

SIMULATION MODE

is set to "Pre-Fault to Fault", the

Pre-Fault values will be substituted for the period of time specified by the delay, followed by the Fault values. If a trip
occurs, the

SIMULATION MODE

reverts to "Off". Selecting "Off" for the

SIMULATION MODE

places the 489 back in service. If the

489 measures current or control power is cycled, the

SIMULATION MODE

automatically reverts to "Off".

If the 489 is to be used for training, it might be desirable to allow all parameter averages, statistical information, and event
recording to update when operating in simulation mode. If however, the 489 has been installed and will remain installed on
a specific generator, it might be desirable assign a digital input to Test Input and to short that input to prevent all of this data
from being corrupted or updated. In any event, when in simulation mode, the 489 In Service LED (indicator) will flash, indi-
cating that the 489 is not in protection mode.

SIMULATION MODE
[ENTER] for more

SIMULATION MODE:

Off

Range: Off, Simulate Pre-Fault, Simulate Fault, Pre-Fault

to Fault

PRE-FAULT TO FAULT

TIME DELAY:

15 s

Range: 0 to 300 s in steps of 1

ENTER

ESCAPE

MESSAGE

ESCAPE