GE 469 Instruction Manual page 38

469
Motor Management Relay
2–2
Typical applications include: pumps, fans, compressors, mills, shredders, extruders,
debarkers, refiners, cranes, conveyors, chillers, crushers, and blowers.
Some of the protection highlights are detailed here; a complete list is shown below.
Four assignable digital inputs may be configured for a number of different features
including tachometer or generic trip and alarm with a programmable name. The
thermal model incorporates unbalance biasing, RTD feedback, and exponential
cooling. In addition to the 15 standard overload curves, there is a custom curve
feature and a curve specifically designed for the starting of high inertia loads, 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 Multilin 50:0.025 Ground CT. CT inputs 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 quantities. Four
4 to 20 mA analog inputs may be used for tripping and alarming on any transducer
input such as vibration, pressure, flow, etc.
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
48 Incomplete Sequence (Reduced Voltage Start)
Remote Start/Stop
Over Torque
Forced Relay Operation
FIGURE 2–2: Protection Features
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GE Multilin