Typical Applications - GE 239 Instruction Manual

1.1.2

Typical Applications

1–6
Courtesy of NationalSwitchgear.com
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 mechanical 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).
CHAPTER 1: OVERVIEW
239 MOTOR PROTECTION RELAY – INSTRUCTION MANUAL