ABB FPTC-01, User Manual

Page: 22 / 108

22 Hardware description

Operation basics
The module includes two PTC sensor inputs:
•
XFLT executes the 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 rises above the PTC sensor limit
temperature, the sensor resistance increases sharply. This
indicates overtemperature to the FPTC-01 module. The FPTC-01
module executes the SMT function by switching off 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.
Note : If you want to disable the SMT function, you have to connect
a resistor (100 ohm...1 kohm 1/4 W wire-wound) in the XFLT input
instead of a PTC sensor.
XWRN input (Warning)
When the motor temperature rises above the PTC sensor limit
temperature, the sensor resistance increases sharply. The module
sends a warning indication to the drive.
For the resistance limits and other technical details of the FPTC-01
module, see chapter
Technical data .