2 469 MOTOR MANAGEMENT RELAY – QUICK REFERENCE GUIDE
QUICK REFERENCE GUIDE
1Description
The 469 Motor Management Relay is a microprocessor-based relay designed for the
protection and management of medium and large horsepower motors and driven
equipment. The 469 is equipped with six (6) output relays for trips, alarms, and start blocks.
Motor protection, fault diagnostics, power metering, and RTU functions are integrated into
one economical drawout package.
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 (where 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.
Each relay provides protection, control, and monitoring functions with both local and
remote human interfaces. They also display the present trip/alarm conditions, and
measured system parameters. Recording of past trip, alarm or control events, maximum
demand levels, and energy consumption is also performed.
To aid new users in getting basic protection operating quickly, setpoints are set to typical
default values and advanced features are disabled. These settings can be reprogrammed
at any time.
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