Siemens 1FT6 03 Série Mode D'emploi page 158

Motor Components (Options)
3.1 Thermal motor protection
A temperature–dependent resistor is integrated in the stator winding as tempera-
ture sensor. This temperature sensor monitors the motor temperature.
Table 3-1
Type
Resistance when cold (20 °C)
Resistance when hot (100 °C):
Connection
Response temperature
The resistance of the KTY 84 thermistor changes proportionally to the winding
temperature change (refer to Fig. 3-1).
The temperature signal is sensed and evaluated in the drive converter whose clo-
sed–loop control takes into account the temperature characteristic of the motor
resistances.
When a fault occurs, an appropriate message is output at the drive converter. Bei
steigender Motortemperatur wird eine Meldung "Vorwarnung Motorübertemperatur"
ausgelöst, die extern ausgewertet werden kann. If this signal is not observed, the
drive converter shuts down with the appropriate fault message when the motor li-
miting temperature or the shutdown temperature is exceeded.
Warning
!
If the user carries–out an additional high–voltage test, then the ends of the
temperature sensor cables must be short–circuited before the test is carried–out!
If the test voltage is connected to a temperature sensor terminal, then it will be
destroyed.
The polarity must be carefully observed.
The temperature sensor has been designed so that the DIN/EN requirements for
protective electrical separation are fulfilled.
 Siemens AG 2004 All rights reserved
Synchronous Servomotors, 1FT6 (PFT6) – 02.04 Edition
Features and technical data
KTY 84
approx. 580 Ohm
approx. 1000 Ohm
via signal cable
Alarm at 120 °C
Shutdown at 155 °C  5 °C
3
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