ABB FSPS-21, User Manual

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Acknowledgement methods
The safety functions have one acknowledgement method for entering the Operational state
(during start-up, or after a safety function request is removed):
• Automatic : The module grants the drive permission to restart after a safety function
request is removed or the start-up is complete. If the drive is in the automatic restart
mode, it starts automatically, which may cause danger.
Note:
In addition, you can create a manual acknowledgement method in the safety PLC program.
WARNING!
FSPS-21 module only has the automatic acknowledgement method. Make sure
that the system does not start up unexpectedly, eg, due to automatic start of the
drive.
States and modes
￭ States
When the FSPS-21 module is up and running, it can be in one of the following states
depending on the drive STO status:
• Safe : STO active, that is, the drive STO circuit is open, modulation stops, and motor
coasts.
• Operational : STO inactive.
In the Operational and Safe states, the FSPS-21 module can execute the safety functions.
￭ Modes
The FSPS-21 can be in one of the following modes:
• Power down : The power to the FSPS-21 is off. The drive STO circuit is open.
• Start-up : The FSPS-21 is starting up after power-up.
• Running : The FSPS-21 is up and running. It can be in different states (see previous
section) depending on the status of safety functions and the safety fieldbus
communication.
• Failure-detected : The FSPS-21 has detected a failure, drive STO is activated, and
FSPS-21 enters the Fail-safe mode. It can be in different states (see previous section)
depending on the status of safety functions and the safety fieldbus communication.
• Fail-safe : There is a failure in the FSPS-21 and Safe state has been reached. The drive
STO is active. You have to reboot the FSPS-21 to exit the Fail-safe mode.
For more information on the FSPS-21 LEDs, see section LEDs (page 183) .
For more information on the states and modes, see FSPS-21 module modes and
states (page 117) .
￭ Safety functions indications
You can see the status of safety functions from the PROFIsafe message. Only PROFIsafe
information can be used for functional safety applications.
In addition, the drive indicates the drive STO status according to parameter 31.22 STO
indication run/stop . For more information, see the firmware manual.
30 Safety functions