OperationStep
Initial status: The drive is in operation and the motor is running.
The user activates emergency stop with the emergency stop button [S61]. This activates the safety
function in the FSO module.
1
Emergency stop, stop category 0: The FSO module [A68] activates the drive STO function, opens
the main contactor [Q2], and opens the charging supply contactor [Q3].
2
Emergency stop, stop category 1: The drive decelerates the motor to zero speed. The FSO module
[A68] then activates the drive STO function, opens the main contactor [Q2], and opens the charging
supply contactor [Q3].
The emergency stop reset button indicator light [S62] comes on.3
Normal operation resumes after the user:
4
• releases the emergency stop button [S61] to normal (up) position
• pushes the emergency stop reset button [S62], which resets the emergency stop circuit and closes
the main contactor [Q2]
• switches the external start signal of the drive off and on (only in external control mode)
•
resets the drive/inverter unit if a fault was generated (see FSO parameter FSOGEN.61 STO indic-
ation ext request, and drive parameter 31.22 STO indication run/stop).
Fault reaction function
Definition: A safety function requires a “fault reaction function” that tries to initiate a safe
state if it detects a failure in the safety system.
Examples of different failures:
• a short or open circuit or redundancy failure of the emergency stop button wiring chain
• a missing main contactor/breaker feedback signal
• an internal failure in the FSO or FSE-31 modules, the safety encoder or the drive STO.
This section describes the fault reaction functions in the FSO and FSE-31 modules, the
safety encoder and the drive STO.
￭ 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 and opens the main contactor/breaker. The drive STO function is active until
the fault is repaired.
The FSO module goes into Fail-safe mode. The STATUS/FAULT LED of the FSO module
is red until the fault is repaired. To exit the Fail-safe mode, remove the cause of the fault
and reset the FSO module. See section Resetting the FSO module (page 38).
For more information, see the drive firmware manual and the FSO module user’s manual.
Resetting the FSO module
To reset the FSO module:
• switch the power off and on, or
• press the Boot FSO button on the Safety view of Drive composer pro, or
•
use the drive parameter 96.09 FSO reboot.
38 Option description
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