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22 Hardware description
board is PELV compatible also when the FPTC-02 module and a
thermistor protection circuit are installed.
￭
Operation basics
The module includes two PTC sensor inputs:
•
XFLT activates the ATEX-certified SIL/PL capable SMT safety
function by activating the drive Safe torque off (STO) function.
This input is a safety-related input and can be used for protection
function purposes.
•
XWRN generates a warning to the drive. This is not a
safety-related input and can only be used for indication purposes.
XFLT input (Fault)
When the motor temperature increases to the PTC sensor
temperature limit, the sensor resistance increases sharply. This
indicates overtemperature to the FPTC-02 module. 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.
To disable the SMT function, connect a resistor (100 ohm ... 1 kohm
1/4 W wire-wound) to the XFLT input instead of a PTC sensor.
XWRN input (Warning)
When the motor temperature increases to the PTC sensor
temperature limit, the sensor resistance increases sharply. The
FPTC-02 module sends a warning indication to the drive.
For the resistance limits and other technical details of the FPTC-02
module, see the technical data.
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