Stober PK - Page 401

11.6.5.1 PTC thermistor
The PTC thermistor is installed as a standard temperature sensor in STOBER synchronous servo motors.
The PTC thermistor is a triple thermistor in accordance with DIN 44082 that can be used for monitoring the
temperature of each winding phase. The resistance values in the following table and curve refer to a single
thermistor in accordance with DIN 44081. These values must be multiplied by 3 for a triple thermistor in ac-
cordance with DIN 44082.
Feature Description
Nominal response temperature ϑ
NAT
145 °C ± 5 K
Resistance R −20 °C up to ϑ
NAT
− 20 K ≤ 250 Ω
Resistance R with ϑ
NAT
− 5 K ≤ 550 Ω
Resistance R with ϑ
NAT
+ 5 K ≥ 1330 Ω
Resistance R with ϑ
NAT
+ 15 K ≥ 4000 Ω
Operating voltage ≤ DC 7.5 V
Thermal response time < 5 s
Thermal class 155 (F) in accordance with EN 60034-1 (155°C, heat-
ing Δϑ = 100K)
Fig.2: PTC thermistor curve (single thermistor)
11 EZsynchronous servo motors 11.6 Product description
401