GE Industrial Solutions EntelliPro ES - Manual (Page 137)

CHAPTER 3: MOTOR PR OTECTION
EP OS MOTOR MANAGEMENT SY STEM – INSTRUCTION MANUAL 3.25
3.6 Thermistor (TMA)
The thermistor protection module protects a motor by evaluating a PTC resistor inside the motor. The system allows
connection of 1, 3, or 6 thermistors in series, per IEC34-11-2.
The main features of thermistor protection are as follows:
  Trip value is 3.6 kΩ.
  Reset value is 1.5 kΩ.
  Short-circuit value is approximately < 20 Ω.
   Broken wire value is approximately > 4k kΩ.
Thermistor short and open detection is set in the WinESG parameterization/typical settings panel shown in the
illustration below or in Modbus function code 6 register 130 bit2. If set a warning or failure will be generated in case of
short or open thermistor condition, depending o
n the alarm setting.
Thermistor can be enabled or disabled, set as a warning or failure and requiring an auto or manual reset after a
failure, in WinESG parameterization/alarms panel shown in illustration below or Modbus function code 6 registers
114 (enable/disable), 64 (warning/failure), and 63 (auto/manual reset).
NOTE: For ATEX application, thermistor protection cannot be disabled or set to warning.