Temperature Sensor - Siemens MICROMASTER 440 Operating Instructions Manual

3 Functions
3.21.2

Temperature sensor

When the motor is operated below the
rated speed the cooling effect of the
shaft-mounted fan is reduced. As a
result, for most motors when continually
operated at lower frequencies, the
power has to be reduced. Under these
conditions, motor protection against
overheating can only be guaranteed if
either a temperature sensor (PTC or
KTY84 sensor) is integrated in the
motor and is connected to the control
terminals 14 and 15 of the
MICROMASTER 440 (refer to Fig. 3-94)
or the motor temperature model was
determined (refer to Section 3.21.1).
NOTE
In order to avoid EMC noise from being coupled-in to the drive converter
electronics – and the associated disturbances – it is not permissible to use free
conductors in the motor cable to connect the temperature sensor to the drive
converter.
The temperature sensor must be connected to the drive converter using a separate
cable (if at all possible, this cable should be shielded).
230
Kl. 14
PTC/
KTY
Kl. 15
Fig. 3-94 Connecting a temperature
sensor to MICROMASTER
MICROMASTER 440
6SE6400-5AW00-0BP0
Issue 10/06
5 V
574 Ω
A
D
Operating Instructions