Waveform Capture; Memory Map - GE 469 Instruction Manual

6 COMMUNICATIONS
The 469 stores a number of cycles of A/D samples each time a trip occurs in a trace buffer. The trace buffer is partitioned
according to the
S1 PREFERENCES
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PREFERENCES TRACE MEMORY TRIGGER
The trace buffer is time and date stamped and may be correlated to a trip in the event record. 10 waveforms are captured
this way when a trip occurs. These are the 3 phase currents, 3 differential currents, ground current and 3 voltage wave-
forms. This information is stored in volatile memory and will be lost if power is cycled to the relay.
To access the captured waveforms, select the waveform of interest by writing its trace memory channel (see following
table) to the Trace Memory Channel Selector (address 30F1h). Then read the trace memory data from address 3100h to
3400h. There are 12 samples per cycle for each of the cycles. The values read are in actual amperes or volts.
TRACE MEMORY
CHANNEL
0
1
2
3
4
5
6
7
8
9
Address 30F8h shows the number of traces taken. To access the latest use the value at address 30F0h. To access more
than 1 trace, reduce this value to access the older traces.
GE Multilin
Courtesy of NationalSwitchgear.com
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TRACE MEMORY BUFFERS
setpoint and this determines how many pre-trip and post-trip cycles are stored.
WAVEFORM
Phase A current
Phase B current
Phase C current
Differential phase A current
Differential phase B current
Differential phase C current
Ground current
Phase A voltage
Phase B voltage
Phase C voltage
469 Motor Management Relay

6.3.4 WAVEFORM CAPTURE

setpoint. The Trace Memory Trigger is set up with the

6.3 MEMORY MAP

S1
6
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