GE MOTOR MANAGEMENT RELAY 469 Instruction Manual page 14

1.1 OVERVIEW
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
1
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 Power Management 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. Volt-
age 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
86
66
50
32
37
46
50G/51G
87
49
38
27/59
47
81
55/78
1-2
Overload
Overload Lockout
Starts/Hour & Time Between Starts
Restart Block (Anti-Backspin Timer)
Short Circuit & Short Circuit Backup
Mechanical Jam
Reverse Power
Undercurrent/Underpower
Current Unbalance
Ground Fault & Ground Fault Backup
Differential
Acceleration
Stator RTD
Bearing RTD
Other RTD & Ambient RTD
Open RTD Alarm
Short/Low RTD
Undervoltage/Overvoltage
Phase Reversal
Frequency
Reactive Power
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
469 Motor Management Relay
1 INTRODUCTION
PROCTLA5.CDR
GE Power Management