ABB ACS880-37LC-0390A-7, Hardware Manual, Page: 88 / 242

The settings of the FSO module have default values when delivered from the factory. The
wiring of the external safety circuit and configuration of the FSO module are the responsibility
of the user.
The FSO module reserves the standard Safe torque off (STO) connection of the drive control
unit. STO can still be utilized by other safety circuits through the FSO module.
See the appropriate manual for more information.
Code Name
3AXD50000015612 FSO-12 safety functions module user's manual
3AXD50000015614 FSO-21 safety functions module user's manual
Implementing the power loss ride-through function
If the incoming supply voltage is cut off, the drive will continue to operate by utilizing the
kinetic energy of the rotating motor. The drive will be fully operational as long as the motor
rotates and generates energy to the drive.
If the drive is equipped with a main contactor or breaker, it restores the drive input power
after a short break. The contactor re-connects after the break automatically. If the drive is
equipped an external uninterruptible auxiliary power supply (G307), it keeps the
main contactor closed in power-loss situations
Note: If the power loss lasts so long that the drive trips on undervoltage, a fault reset and
a fresh start command is required to continue operation.
Implement the power-loss ride-through function as follows:
1. Enable the power-loss ride-through function of the drive (parameter 30.31 ).
2. Enable the automatic restart of the motor after a short power supply break:
• Set the start mode to automatic (parameter 21.01 or 21.19 , depending on the motor
control mode being used).
• Define the automatic restart time (parameter 21.18 ).
WARNING!
Make sure that a flying restart of the motor will not cause any danger. If you are in
doubt, do not implement the power loss ride-through function.
Implementing a bypass connection
If bypassing is required, employ mechanically or electrically interlocked contactors between
the motor and the drive and between the motor and the power line. Make sure with
interlocking that the contactors cannot be closed simultaneously. The installation must be
clearly marked as defined in IEC/EN/UL 61800-5-1, subclause 6.5.3, for example, “THIS
MACHINE STARTS AUTOMATICALLY”.
Bypass connection is available as a factory-installed option for some cabinet-installed drive
types. Consult ABB for more information.
WARNING!
Never connect the drive output to the electrical power network. The connection may
damage the drive.
88 Guidelines for planning the electrical installation