ABB ACS880-17, User Manual

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Option description and instructions 15
2
Option description and
instructions
Contents of this chapter
This chapter describes the operation of the Q979: Emergency stop, configurable
stop category 0 or 1 and instructs how to wire and use it.
Overview
The Q979 uses the FSO-12 safety functions module (Q973) or the
FSO-21 safety functions module (Q972) for the Emergency stop safety function.
ABB installs the FSO safety functions module and the emergency stop circuit to the drive
and sets default parameter values for the option at the factory. The user tunes the
operation of the Emergency stop function with the FSO module parameters at the start-up,
for example, sets the appropriate stop category (0 or 1). ABB sets stop category 0 at the
factory.
When a safety pulse encoder is used in the safety application, also the FSE-31 pulse
encoder interface module (L521) is installed in the drive. ABB installs the FSE
module to the drive and sets the delivery configuration for the cabinet safety option at the
factory.
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Emergency stop, stop category 0
This is an uncontrolled stop (EN/IEC 60204-1). When the user pushes the emergency
stop button, he/she actually activates the Safe torque off (STO) function of the FSO
module. This activates the STO function of the drive. 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. The motor coasts to
a stop.