GE 489 - Manual (Page 128)

4-78 489 Generator Management Relay GE Multilin
4.13 S12 TESTING 4 SETPOINTS
4
4.13S12 TESTING 4.13.1 SIMULATION MODE
PATH: SETPOINTS ÖØ S12 TESTING Ö 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
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MESSAGE
ESCAPE