Event Recorder; Waveform Capture; Memory Map - GE MOTOR MANAGEMENT RELAY 469 Instruction Manual

6 COMMUNICATIONS
The 469 event recorder data starts at address 3000h. Address 3003h is a pointer to the event of interest (1
representing the latest event and 40 representing the oldest event). To retrieve event 1, write '1' to the Event
Record Selector (3003h) and read the data from 3004h to 3022h. To retrieve event 2, write '2' to the Event
Record Selector (3003h) and read the data from 3004h to 3022h. All 40 events may be retrieved in this man-
ner. The time and date stamp of each event may be used to ensure that all events have been retrieved in order
without new events corrupting the sequence of events (event 1 should be more recent than event 2, event 2
should be more recent than event 3, etc.).
The 469 stores a number of cycles of A/D samples each time a trip occurs in a trace buffer, determined by the
setpoint in S1 Preferences, Trace Memory Buffers. The Trace Memory Trigger is set up in S1 Preferences and
this determines how many pre-trip and post-trip cycles are stored. 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 waveforms. This informa-
tion 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 Differential phase A current
4 Differential phase B current
5 Differential phase C current
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 Power Management
WAVEFORM
Phase A current
Phase B current
Phase C current
Ground current
Phase A voltage
Phase B voltage
Phase C voltage
469 Motor Management Relay

6.4 MEMORY MAP

6.4.3 EVENT RECORDER

6.4.4 WAVEFORM CAPTURE

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