Thermistor (Tma) - GE EntelliPro ES Series Installation And Instruction Manual

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 on 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.
EP OS MOTOR MANAGEMENT SY STEM – INSTRUCTION MANUAL
CHAPTER 3: MOTOR PR OTECTION
3.25