Features and technical specifications:
1. Status/current/temperature display
2. Fault diagnosis
3. Trip record
4. Memory lockout
5. Thermal capacity / load% / RTD analog output
6. Trip / alarm / auxiliary / service relay outputs
7. Motor Running Hours
8. Motor maximum current on last start
9. Simulation mode for field testing
10.Clear LCD display
11. RS485 Modbus communications interface
12. AC/DC control power
13. Compact size, fits most starters
14. Update options and/or MODs in field CSA/UL Approved
15. Conformal coating for harsh environment
PROTECTION :-
1. Overload (15 selectable curves)
2. Short circuit
3. Locked rotor
4. Stall / mechanical jam
5. Repeated starts (Mod 505)
6. Single phase / unbalance
7. Ground fault
8. Over temperature ( Thermistor & 3 RTDs )
9. Undercurrent
10.Overload warning
11.Breaker failure This Motor Protection relay block is easily insert in your schematic diagram and connect as you like way. The GE Multilin 239 relay is designed to fully protect three phase AC motors against conditions which can cause damage. In addition to motor protection, the relay has features that can protect associated mechanical equipment, give an alarm before damage results from a process malfunction, diagnose problems after a fault and allow verification of correct relay operation during routine maintenance. Using the ModBus serial communications interface, motor starters throughout a plant can be connected to a central control/monitoring system for continuous monitoring and fast fault diagnosis of a complete process. One relay is required per motor. Since phase current is monitored through current
transformers, motors of any line voltage can be protected. The relay is used as a pilot device to cause a contactor or breaker to open under fault conditions; that is, it does not carry the primary motor current. When the over temperature option is ordered, up to 3 RTDs can be monitored. These can all be in the stator or 1 in the stator and 2 in the bearings. Installing a 239 in a motor starter for protection and monitoring of motors will minimize downtime due to process problems.
Applications :-
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 set points, issue commands and diagnose faults to minimize process disruptions.
5. Output of motor current suitable for programmable controller interface (4 to 20 mA)
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