Note: The indications of the safety function are not SIL classified.
Fault reaction function
￭ FPTC-02 module
The FPTC-02 module has a fault reaction function. When the module
detects an internal fault or a fault in the temperature sensor circuit,
it sends a request to the drive control unit to stop modulation, and
activates the drive STO function.
￭ STO function in the drive/inverter modules
The STO function in the drive/inverter module has internal fault
diagnostics and a fault reaction function. The fault reaction function
causes a fault trip if it detects a redundancy fault of STO control
signals or any internal failure. For more information, see the hardware
and firmware manuals of the drive/inverter module.
￭ FSO module
The fault reaction function of the FSO module trips the drive if it
detects a failure. The FSO module activates the STO or Safe stop
emergency (SSE) function. This activates the drive STO function.
The drive STO function is active until the fault is repaired.
Note: With the FPTC module, the recommended type of the SSE
function is Immediate STO, but other safety functions in the FSO
module can require that the type is Emergency ramp. With both
settings, the FSO module always activates the drive STO function
immediately in motor overtemperature situations (SMT function
activated).
The FSO module goes into the Fail-safe mode. The FSO module
LED STATUS/FAULT is red until the fault is repaired. To exit the
Option description and instructions 33
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