CHAPTER 2: INTRODUCTION
469 MOTOR MANAGEMENT RELAY – INSTRUCTION MANUAL 2–3
FIGURE 2–2: Protection Features
Fault diagnostics are provided through pretrip data, event record, trace memory, and
statistics. Prior to issuing a trip, the 469 takes a snapshot of the measured parameters and
stores them with the cause of the trip. This pre-trip data may be viewed using the
MENU
key, viewing the
TARGET MESSAGES before the trip is reset, or by accessing the A1 STATUS
ZV LAST TRIP DATA actual values. The 469 event recorder stores up to 256 time and date
stamped events including the pre-trip data. Each time a trip occurs, the 469 stores 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
analog inputs, along with maximum values for RTDs, are also recorded. These features
enable the operator to pinpoint a problem quickly and with certainty.
Power metering included with the 469 as a standard feature. The table below outlines the
metered parameters available either through the front panel or communications ports.
51 Overload
86 Overload Lockout
66 Starts/Hour & Time Between Starts
Restart Block (Anti-Backspin Timer)
50 Short Circuit & Short Circuit Backup
Mechanical Jam
37
32
Undercurrent/Underpower
Reverse Power
46Current Unbalance
50G/51G Ground Fault & Ground Fault Backup
87 Differential
Acceleration
49 Stator RTD
38 Bearing RTD
Other RTD & Ambient RTD
Open RTDAlarm
Short/Low RTD
27/59 Undervoltage/Overvoltage
47 Phase Reversal
81 Frequency
Reactive Power
55/78 Power Factor
Analog Input
Demand Alarm: A kW kvar kVA
SR469 Self-Test, Service
Trip Coil Supervision
Welded Contactor
Breaker Failure
Remote Switch
14 Speed Switch & Tachometer Trip
Load Shed Switch
Pressure Switch
Vibration Switch
19 Reduced Voltage Start
48
Over Torque
Remote Start/Stop
PROCTLA5.CDR
Incomplete Sequence (Reduced Voltage Start)
Forced Relay Operation
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