Option Description; Contents Of This Chapter; Overview - ABB ACS880 User Manual

Option description

Contents of this chapter

This chapter describes the operation of the option +Q966, Safely-limited speed without the
encoder interface, and its settings.

Overview

Option +Q966 uses the FSO-12 safety functions module (option +Q973) or FSO-21 safety
functions module (option +Q972). ABB installs the FSO modules to the inverter units and
sets the delivery configuration for the option at the factory.
With option +Q966, these safety functions are configured in the FSO modules at the factory:
• Safely-limited speed (SLS). This function prevents the motor speed from exceeding the
user-defined speed limits.
• Safe maximum speed (SMS). This function prevents the machine from exceeding the
user-defined maximum speed of the machine or process.
• Safe speed monitor (SSM). This function provides a safe output signal to indicate when
the motor speed is between user-defined limits.
The user defines the operation of the safety functions with the FSO module parameters at
the start-up, for example, by setting the speed limits.
Note: If the Safe brake control (SBC) function is used, it is also activated according to the
configuration (either before or after the drive STO function is activated, or at a specified
speed limit). In this case, make sure that you have dimensioned the brake correctly for these
situations. For more information, refer to the FSO module user's manual.
Note: A safety function request to the FSO module must be active for a minimum of 20 ms.
For more information on the safety functions of the FSO module, refer to FSO-12 safety
functions module user's manual (3AXD50000015612 [English]) or FSO-21 safety functions
module user's manual (3AXD50000015614 [English]).
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