Option description
Contents of this chapter
This chapter describes the operation and settings of the option +Q978: Emergency stop,
configurable stop category 0 or 1 with opening the main contactor/breaker and STO, with
FSO.
Overview
The option +Q978 uses the FSO-12 safety functions module (option +Q973) or the FSO-21
safety functions module (option +Q972) for the emergency stop safety function. In this
emergency stop option, the Safe torque off (STO) circuit of the drive and the main
contactor/breaker are opened.
ABB installs the FSO module, the main contactor (option +F250) or the main breaker (option
+F255), and the emergency stop circuit to the drive. ABB sets default parameter values for
the option at the factory. The user adjusts the operation of the emergency stop function with
the safety parameters at the start-up, for example, sets the stop category (0 or 1). ABB sets
stop category 0 at the factory.
If option +L521 is selected, ABB installs the FSO-21 safety functions module and FSE-31
pulse encoder interface module to the drive. With this option, you can use a safety encoder
in the application.
Note: The FSE-31 module requires the FSO-21 module. The FSO-12 module is not
compatible with the FSE-31 module or safety encoders.
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Option description 17
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