Motor Temperature Sensing - Siemens SINAMICS S120 Function Manual

8.5.2

Motor temperature sensing

Temperature sensors
The motor temperature is sensed using temperature sensors integrated in the motor
windings. The sensors used are selected as standard from the following four different sensor
types:
● PTC
● KTY84
● PT100/PT1000
● Bimetallic sensor with NC contact (abbreviated, "bimetal NC contact")
Function of the PTC
The temperature sensor is connected to the Sensor Module at the appropriate terminals (-
Temp) and (+Temp) (see the relevant section in the SINAMICS S120 Control Units and
Supplementary System Components Manual). The threshold value for switching over to an
alarm or fault is 1650 Ω.
A PTC usually has a strongly non-linear characteristic, and as a consequence is used just
like a switch. When the typical rated response temperature is exceeded, then the resistance
changes abruptly (step function). The tripping resistance is ≥1650 Ohm.
● p0600 = 1 activates the motor temperature sensing using sensor 1
● p0601 = 1 sets the PTC temperature sensor type
Function of the KTY
The temperature sensor is connected to the Sensor Module at the appropriate terminals (-
Temp) and (+Temp) (see the relevant section in the SINAMICS S120 Control Units and
Supplementary System Components Manual).
A KTY84/1C130 temperature sensor has an almost linear characteristic and is therefore also
suitable for continuously measuring and displaying the motor temperature. KTY sensors are
used for measuring the motor temperature in the range from -140° C up to +188.6° C. Actual
temperature values outside this range are not taken into account.
● p0600 = 1 activates the motor temperature sensing using sensor 1
● p0601 = 2 sets the KTY temperature sensor type
Function of the PT100/PT1000
A PT100 or PT1000 is in principle a PTC with a very linear characteristic, and is suitable for
continuous and exact temperature measurements. Not every sensor input is PT100/PT1000-
capable.
● p0600 = 1 activates the motor temperature sensing using sensor 1
● p0601 = 5 sets the PT100 temperature sensor type
Drive functions
Function Manual, (FH1), 01/2013, 6SL3097-4AB00-0BP3
Monitoring and protective functions
8.5 Thermal motor protection
539