Motor Temperature Sensing - Siemens SINAMICS S120 Function Manual

Monitoring functions and protective functions
9.5 Thermal motor protection
Thermal motor model 3
• p0612[0...n]
• p0613[0...n]
• r0631[0...n]
• r0632[0...n]
• r0633[0...n]
• p5350[0...n]
• p5390[0...n]
• p5391[0...n]
9.5.2

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 temperature sensor type "PTC"
646
Mot_temp_mod activation
Mot_temp_mod 1/3 ambient temperature
Mot_temp_mod stator iron temperature
Mot_temp_mod stator winding temperature
Mot_temp_mod rotor temperature
Mot_temp_mod 1/3 zero speed boost factor
Mot_temp_mod 1/3 alarm threshold
Mot_temp_mod 1/3 fault threshold
Function Manual, 11/2017, 6SL3097-4AB00-0BP5
Drive functions