OVERVIEW 1. INTRODUCTION
1-2
Table 1-1 SR469 PROTECTION FEATURES
Fault diagnostics are provided through pretrip data, event record, trace memory, and statistics. Prior to issuing a trip, the SR469 will take
a snapshot of the measured parameters and store them in a record with the cause of the trip. This pre-trip data may be viewed using the
[NEXT] key before the trip is reset, or by accessing the last trip data of Actual Values page 1. The SR469 event recorder will store up to
40 time and date stamped events including the pre-trip data. Each time a trip occurs, the SR469 will store a trace of 8 cycles pre-trip and
8 cycles post-trip for all measured AC quantities. Trip counters record the number of occurrences of each type of trip. Minimum and
maximum values for RTDs and analog inputs are also recorded. These features will enable the operator to pinpoint a problem quickly
and with certainty.
Power metering is built into the SR469 as a standard feature. Table 1-2 outlines the metered parameters that are available to the
operator or plant engineer either through the front panel or through the communications ports. The SR469 is equipped with 3 fully
functional and independent communications ports. The front panel RS232 port may be used for SR469 setpoint programming, local
interrogation or control, and upgrading of SR469 firmware. The Computer RS485 port may be connected to a PLC, DCS, or PC based
man-machine interface program. The Auxiliary RS485 port may be used for redundancy or simultaneous interrogation and/or control
from a second PLC, DCS, or PC program. There are also four 4-20 mA transducer outputs that may be assigned to any measured
parameter. The range of these outputs is scaleable.
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