58 - PVD3627-August 2011
3.6.2.
Motor temperature can also be continuously measured by the drive using a KTY 84-
130 thermal sensor built in to the stator winding. KTY sensors are semiconductor
sensors that change their resistance according to an approximately linear
characteristic. The required temperature limits for alarm and tripping can be set in the
drive.
Temperature measurement with KTY sensors:
The graph below shows the KTY sensor resistance as a function of temperature, for
a current of 2 mA:
Warning
: KTY sensor is sensitive to electrostatic discharge. So,
always wear an antistatic wrist strap during KTY handling.
Warning
: KTY sensor is polarized. Don’t invert the wires.
Warning
: KTY sensor is sensitive. Don’t check it with a Ohmmeter or
any measuring or testing device.
