GE 469 Instruction Manual page 8

1.1 OVERVIEW
when the acceleration time exceeds the safe stall time. A second overload curve is provided for two-speed motors. Ground
faults or earth leakage as low as 0.25 A may be detected using the GE Power Management 50:0.025 Ground CT. CT inputs
1
for phase differential protection are also provided. The 12 RTD inputs provided may be individually field programmed for
different RTD types. Voltage transformer inputs allow for numerous protection features based on voltage and power quanti-
ties. Four 4 to 20 mA analog inputs may be used for tripping and alarming on any transducer input such as vibration, pres-
sure, flow, etc.
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 NEXT
469 event recorder stores up to 40 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 RTDs and analog inputs 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.
1-2
Courtesy of NationalSwitchgear.com
51 Overload
86 Overload Lockout
66 Starts/Hour & Time Between Starts
Restart Block (Anti-Backspin Timer)
50 Short Circuit & Short Circuit Backup
Mechanical Jam
32 Reverse Power
37 Undercurrent/Underpower
46 Current Unbalance
50G/51G Ground Fault & Ground Fault Backup
87 Differential
Acceleration
49 Stator RTD
38 Bearing RTD
Other RTD & Ambient RTD
Open RTD Alarm
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
Incomplete Sequence (Reduced Voltage Start)
48
Remote Start/Stop
Over Torque
Forced Relay Operation
Figure 1–2: PROTECTION FEATURES
key before the trip is reset, or by accessing the
469 Motor Management Relay
1 INTRODUCTION
PROCTLA5.CDR
Õ×
A1 STATUS LAST TRIP DATA
actual values. The
GE Multilin