Siemens Synchronous Motors, 1Fk7Xxx Series - HEIDENHAIN TNC 410 M Technical Manual

7.13 SIEMENS Synchronous Motors, 1FK7xxx Series

a. Stall torque of the motor in [Nm]
7 – 226
A temperature-sensitive resistor for monitoring the motor temperature is
installed in the stator winding.
Type
Cold resistance (20 °C)
Hot resistance (100 °C)
Response temperature
Connection
The change in the resistance of the KTY 84 is proportional to the change in the
winding temperature.
The controller unit is responsible for the measurement and evaluation of the
temperature signal, and also considers the changes in the temperature of the
motor resistors.
If an error occurs, it is reported to the controller. An increase in motor
temperature triggers a message indicating that the motor temperature is too
high, which can be evaluated externally. If this message is ignored, the
controller switches the drive motors off when the temperature limit of the
motor or the cut-out temperature is exceeded and generates a corresponding
error message.
The temperature sensor is designed in such a way that it complies with the
EN/DIN requirement for "electrical separation."
Warning
If the user wants to perform an additional high-voltage test, the line
terminals of the temperature sensors must be short-circuited before
performing the test.
Warning
If the test voltage is only applied to one connecting terminal of the
temperature sensor, the sensor will be destroyed. The polarity must be
carefully observed.
Danger
The temperature sensor installed does not provide adequate protection
from thermally critical loads, such as an excessive load on the stationary
motor. Additional protection, such as a thermal overcurrent relay, must
therefore be provided.
If overloads of 4 * M
also provide additional motor protection.
HEIDENHAIN Technical Manual for Inverter Systems and Motors
KTY 84 (thermistor)
Approx. 580 ohms
Approx. 1000 ohms
Early warning at 120 °C
Switch-off at 155 °C ± 5 °C
Via encoder line
a
are present for more than 4 seconds, you should
0