The ABB 1SFA898209R7000 is a PSTX105 soft starter with built-in auto phase sequence detection — it checks incoming phase rotation before the motor starts, so a reversed-phase condition never reaches the load. That saves a call-out on a pump or conveyor that runs backwards after a line-side breaker swap. Rated for 208-690 V AC at 50/60 Hz, with a ramp time adjustable from 1 to 120 seconds. The control supply takes 100-250 V AC; a separate 24 V DC control circuit handles the logic and fieldbus interface. Communication options cover Modbus-RTU, Modbus-TCP, Ethernet/IP, EtherCAT, DeviceNet, CANopen, Profibus, Profinet, BACnet-IP, and BACnet-MSTP — so it drops into most plant networks without a gateway.
Protection and monitoring depth
Built-in electronic overload protection covers the motor directly, with separate overload curves for start and run (dual-overload). The warning and protection list includes current imbalance, locked rotor, earth fault, phase loss, over/under voltage, power factor underload, and THD(U) — all configurable through the soft starter's menu or fieldbus. Analog outputs (0-10 V, 0-20 mA, 4-20 mA) let a PLC or DCS read motor current or other parameters without an extra transducer.