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GE Multilin 489 Generator Management Relay 4-9
4 SETPOINTS 4.2 S1 489 SETUP
4
4.2.4 REAL TIME CLOCK
PATH: SETPOINTS Ö S1 489 SETUP ÖØ REAL TIME CLOCK
For events that are recorded by the event recorder to be correctly time/date stamped, the correct time and date must be
entered. A battery backed internal clock runs continuously even when power is off. It has the same accuracy as an elec-
tronic watch approximately ±1 minute per month. It must be periodically corrected either manually through the front panel or
via the clock update command over the RS485 serial link. If the approximate time an event occurred without synchroniza-
tion to other relays is sufficient, then entry of time/date from the front panel keys is adequate.
If the RS485 serial communication link is used then all the relays can keep time in synchronization with each other. A new
clock time is pre-loaded into the memory map via the RS485 communications port by a remote computer to each relay con-
nected on the communications channel. The computer broadcasts (address 0) a "set clock" command to all relays. Then all
relays in the system begin timing at the exact same instant. There can be up to 100 ms of delay in receiving serial com-
mands so the clock time in each relay is ±100 ms, ± the absolute clock accuracy in the PLC or PC. See the chapter on
Communications for information on programming the time preload and synchronizing commands.
An IRIG-B signal receiver may be connected to 489 units with hardware revision G or higher. The relay will continuously
decode the time signal and set its internal time correspondingly. The “signal type” setpoint must be set to match the signal
provided by the receiver.
4.2.5 DEFAULT MESSAGES
PATH: SETPOINTS Ö S1 489 SETUP ÖØ DEFAULT MESSAGES
REAL TIME CLOCK
[ENTER] for more
DATE (MM, DD, YYYY):
01/01/1995
Range: 01/01/1995 to 12/31/2094
TIME (HH.MM.SS):
12:00:00
Range: 00:00:00 to 23:59:59
IRIG-B SIGNAL TYPE:
NONE
Range: None, DC Shift, Amplitude Modulated
DEFAULT MESSAGES
[ENTER] for more
GENERATOR STATUS:
Stopped
Range: N/A
A: 0 B: 0
C: 0 Amps
Range: N/A
Vab: 0 Vbc: 0
Vca: 0 Volts
Range: N/A
FREQUENCY:
0.00 Hz
Range: N/A
POWER FACTOR:
0.00
Range: N/A
REAL POWER:
0 MW
Range: N/A
REACTIVE POWER
0 Mvar
Range: N/A
DATE: 01/01/1995
TIME: 12:00:00
Range: N/A
GE MULTILIN
489 GENERATOR RELAY
Range: N/A
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