Typical Applications - GE 239 Instruction Manual

1 OVERVIEW
Versatile features and simple programming controls make the 239 an ideal choice for motor and
equipment protection in a wide range of applications. In addition to basic electrical protection for
motors, the 239 can protect against common faults due to process problems, such as:
1. Mechanical protection of pumps using the undercurrent feature to detect loss of suction or a
closed discharge valve.
2. Personnel safety and mechanical protection of fans against loss of air flow in mines or flow in
steam generating boilers using the undercurrent feature.
3. Electrical protection of compressor motors from excessive run up time caused by an open outlet
using the start timer.
4. Mechanical protection of gears, pumps, fans, saw mill cutters, and compressors against mechan-
ical jam using the mechanical jam trip feature.
5. Safety to personnel from shock hazard using the ground fault feature to detect winding shorts or
leakage currents from moisture in mines.
6. Protection of motors and equipment from operator abuse using the thermal memory lockout
Cost savings are provided using versatile features such as:
1. Diagnostic information after a trip to identify problems and bring the process back on line quickly.
2. Fault indication of ground fault without shutdown to warn that corrective maintenance is required.
3. Simplified spare parts stocking and initial specification design using one universal model for
many motor sizes, applications and settings.
4. Serial communication using the popular Modbus protocol to remotely monitor all values, program
setpoints, issue commands and diagnose faults to minimize process disruptions.
5. Output of motor current suitable for programmable controller interface (4 to 20 mA).
GE Multilin
Courtesy of NationalSwitchgear.com
239 Motor Protection Relay
1 OVERVIEW

1.2 TYPICAL APPLICATIONS

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