Xwrn Input (Warning) - ABB FPTC-02 User Manual

16 Hardware description
The FPTC-02 module then activates the SMT function by opening the drive Safe torque
off (STO) circuit. This activates the drive STO function.
The STO function disables the control voltage of the power semiconductors of the
drive output stage. This prevents the drive from generating the torque required to
rotate the motor. If the motor is running when the STO function is activated, it coasts
to a stop.

XWRN input (Warning)

When the motor temperature increases above the PTC sensor temperature limit, the
sensor resistance increases sharply. The FPTC-02 module sends a warning indication
to the drive. The XWRN input is not safety-related and does not activate the drive STO
function.
For the resistance limits and other technical details of the FPTC-02 module, see the
technical data.