KEB Dynamic Line II Betriebsanleitung Seite 47

2.6.5 Temperature monitoring
PTC thermistors are installed as standard in the NDE winding head to protect the motors against thermal overload
when the temperature change is slow (temperature change in minutes or hours).
max. 30 V DC
Due to the non-ideal thermal coupling, the temperature sensor follows rapid winding temperature changes only
with delay, thus being unable to protect the winding if the thermal overload of the motor is transient and high.
Therefore, additional protection is required (e.g. monitoring I
motor from fast-rising thermal overload.
Overload
The maximum operating voltage of the PTC thermistors must not exceed 30 V DC.
The evaluation of the temperature sensor belongs to the monitoring of the mo-
Caution tor winding. The temperature sensor follows rapid temperature changes only with
delay. Especially the windings of small motors (AxSM.D0 and BxSM.D0) are very
sensitive to overload.
Product Description
x t by the inverter electronic system) to protect the
2
GB - 13