The settings of the FSO-xx are at default when delivered from the factory. The wiring of theexternal safety circuit and configuration of the FSO-xx module are the responsibility of themachine builder.The FSO-xx reserves the standard Safe torque off (STO) connection of the inverter controlunit. STO can still be utilized by other safety circuits through the FSO-xx.For wiring instructions, safety data and more information on the functions provided by theFSO-xx, refer to its manual. See FSO-12 safety functions module user’s manual(3AXD50000015612 [English]).Implementing the Power-loss ride-throughImplement the power-loss ride-through function as follows:• Check that the power-loss ride-through function of the inverter unit is enabled withparameter 30.31 Undervoltage control in the ACS880 primary control program.• Make sure that the control of the main contactor/breaker either keeps the contactorclosed over the short power break, or closes it after the break automatically.WARNING!Make sure that the automatic re-connection of the input power does not causeany danger. If you are in doubt, do not implement the Power-loss ride-throughfunction.WARNING!Make sure that the flying restart of the motor will not cause any danger. If you arein doubt, do not implement the Power-loss ride-through function.￭ Units with main contactor (option +F250)The main contactor of the drive opens in a power-loss situation. When the power returns,the contactor closes. However, if the power-loss situation lasts so long that the drive tripson undervoltage, it must be reset and started again to continue operation. If the power-losssituation lasts so long that the auxiliary power buffer module runs out, the main contactorremains open and the drive operates only after reset and a new start.With external uninterruptible control voltage (option +G307), the main contactor remainsclosed in power-loss situations. If the power-loss situation lasts so long that the drive tripson undervoltage, it must be reset and started again to continue operation.Implementing a bypass connectionIf bypassing is required, employ mechanically or electrically interlocked contactors betweenthe motor and the drive and between the motor and the power line. Make sure withinterlocking that the contactors cannot be closed simultaneously. The installation must beclearly marked as defined in IEC/EN 61800-5-1, subclause 6.5.3, for example, “THISMACHINE STARTS AUTOMATICALLY”.Bypass connection is available as a factory-installed option for certain cabinet-built drivetypes. Consult ABB for more information.90 Guidelines for planning the electrical installation
