PSTX72-690-70 smooth starting device

ABB PSTX Soft Starters — The Flagship Range for Highly Demanding Industrial Applications

The ABB PSTX soft starter series represents the absolute pinnacle of soft starting technology. Tailored for motor currents from 30 to 1250 A (up to 710 kW at 400V, or up to 1200 kW when wired inside-delta), the PSTX range combines high-performance three-phase thyristor control with the most comprehensive motor protection algorithms. The multilingual graphical color display (supporting 17 languages) simplifies programming, while the wide array of communication protocols simplifies integration into digital industrial networks.

Typical Applications for ABB PSTX

• Industrial Ball Mills and Crushers: Using a high-torque Kick-start pulse and flexible starting current limitation, the PSTX easily starts heavy or clogged machinery under full load conditions.
• Wastewater and Municipal Pumping: The built-in Pump Clean function automatically reverses rotation to clean impellers and pipes of solid blockages.
• Long Overland Conveyor Systems: Provides incredibly accurate torque and voltage ramps to prevent mechanical shockwaves on belts, gearboxes, and couplings.

What Differentiates ABB PSTX from Competitors

A key structural advantage of the PSTX series is its patented Limp Mode. This unique feature allows the unit to continue operating on two phases even if one of its main thyristors gets physically damaged.

When ABB PSTX is NOT Suitable

• For simple localized fan drives or low-power pumps where a premium range starter is not financially justified — select the ABB PSR series.
• In systems requiring dynamic continuous motor speed regulation during the process cycle — a VFD must be utilized.

Our Heavy-Duty Field Experience

The PSTX is the most robust and fault-tolerant soft starter on the market, which we have deployed extensively in mining facilities and steel mills. The pre-start motor heating feature injects low-voltage DC current into the windings, safely evaporating condensation in damp, unheated sites. The graphical operator interface can be easily detached and remote-mounted on the panel door using a standard RJ45 Ethernet cable.