Siemens SIMODRIVE 6SN11 Series Planning Manual page 440

1PH7 AC Main Spindle Motors
1.3 Thermal motor protection
1.3
Thermal motor
protection
1PH7
1PH7/1-12
Thermal motor protection
A PTC thermistor is integrated in the stator winding to sense the motor tempera-
ture.
Technical data in Chapter 1.2.1, Encoder systems (GE).
The sensing and evaluation is made in the associated SIMODRIVE/SINUME-
RIK unit, whose closed–loop control takes into account the temperature charac-
teristics of the motor resistances.
An external tripping unit is not required. The PTC thermistor function is monito-
red. An appropriate signal is output to the drive converter when a fault develops.
Connection:
Warning
!
If the user carries–out an additional high–voltage test, the cable ends of the
temperature sensors must be short–circuited before the test! If the test voltage
was to be applied to the temperature sensor, the temperature sensor would be
destroyed.
via encoder
 Siemens AG 2000 All rights reserved
SIMODRIVE Planning Guide Motors (PJM) – 11.00 Edition
09.00
6SN1197–0AA20