Description

Application Scenarios

In a municipal water pumping station, large centrifugal pumps traditionally started with direct-on-line (DOL) contactors experienced severe water hammer, pipe stress, and frequent mechanical seal failures. By integrating the ABB PSTX60-600-70 ACS310 soft starter, engineers configured a linear voltage ramp-up. This gentle start eliminated water hammer, reduced starting current by over 60%, and extended pump bearing life by 30%. The built-in electronic overload protection of the PSTX60-600-70 also prevented motor burnout during voltage dips, transforming a maintenance-heavy system into a reliable, low-stress operation.

Parameter

Main Parameters	Value/Description
Product Model	PSTX60-600-70
Manufacturer	ABB
Product Category	Soft Starter / Motor Controller
Rated Operational Voltage	208–600 V AC, 50/60 Hz
Rated Motor Power	Up to 30 kW (at 400-600V)
Rated Current (Ie)	60 A (In-line connection)
Control Supply Voltage (Us)	100–250 V AC
Starting Mode	Voltage ramp, Torque control, Current limit
Ramp Time Range	1–120 seconds (adjustable)
Initial Start Voltage	30–70% (of line voltage)
Communication	Built-in Modbus RTU; Optional Anybus (Profinet, Ethernet/IP)
Protection Features	Electronic overload (EOL), phase loss, under/over voltage, earth fault
Dimensions (HxWxD)	~260 x 160 x 196 mm

Note: The “70” in the model number typically refers to the initial starting voltage parameter range.

Technical Principles and Innovative Values

The ABB PSTX60-600-70 ACS310 utilizes advanced thyristor (SCR) technology to control the voltage applied to the motor during start and stop cycles, effectively managing torque and inrush current.

Innovation Point 1: Torque-Controlled Soft Start & Stop. Unlike basic voltage-ramp starters, the PSTX60-600-70 can be configured for torque control. This ensures the motor delivers just enough torque to start the load without unnecessary mechanical strain, which is critical for high-inertia applications like crushers or large fans. The soft-stop function prevents “coasting” and provides controlled deceleration for conveyor systems.
Innovation Point 2: Integrated Bypass Contactor & Energy Savings. After the motor reaches full speed, the internal bypass contactor engages, shunting current around the thyristors. This eliminates heat dissipation from the SCRs during run-time, reducing cabinet cooling requirements and saving energy. This built-in feature removes the need for an external bypass contactor, simplifying panel design.
Innovation Point 3: Smart Motor Protection & Diagnostics. The unit goes beyond simple starting; it includes a full suite of protection features like electronic overload (EOL), lock rotor protection, and underload detection. Its event log and real-time clock help maintenance teams diagnose the root cause of faults, such as identifying recurring voltage sags that precede motor trips.

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