GE 239 Instruction Manual page 8

PROTECTION
• Overload (15 selectable curves)
• Short circuit
• Locked rotor
• Stall / mechanical jam
• Repeated starts (Mod 505)
• Single phase / unbalance
• Ground fault
• Overtemperature (Thermistor & 3 RTDs)
• Undercurrent
• Overload warning
• Breaker failure
1–2
Courtesy of NationalSwitchgear.com
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.
Table 1–1:
FEATURES
• Status/current/temperature display
• Fault diagnosis
• Trip record
• Memory lockout
• Thermal capacity / load% / RTD analog output
• Trip / alarm / auxiliary / service relay outputs
• Motor Running Hours
• Motor maximum current on last start
• Simulation mode for field testing
• Clear LCD display
• RS485 Modbus communications interface
• AC/DC control power
• Compact size, fits most starters
• Update options and/or MODs in field
• CSA/UL Approved
• Conformal coating for harsh environment
239 MOTOR PROTECTION RELAY – INSTRUCTION MANUAL
CHAPTER 1: OVERVIEW