ABB 1SFL597001R7011 PSR Series Soft Starter: 700A Motor Starting and Stopping Control

Product Overview

The ABB 1SFL597001R7011 is a high-current soft starter belonging to the PSR series, designed for controlled starting and stopping of three-phase induction motors. This device is rated at 700 amperes with a supply voltage range of 100 to 250 V AC, making it suitable for large industrial motors requiring managed acceleration to reduce mechanical stress and electrical inrush current. The soft starter achieves smooth motor starting by gradually increasing the voltage applied to the motor during the start ramp, limiting the starting current to typically 3 to 4 times the motor full load current compared to 6 to 8 times for direct on-line starting. The PSR series is based on a three-phase controlled thyristor design that offers compact dimensions and a cost-effective solution for applications not requiring advanced communication or bypass contactors.

Key Features of ABB 1SFL597001R7011

The PSR700 soft starter provides adjustable starting and stopping ramp times, configurable through three potentiometers on the front panel for start ramp time, stop ramp time, and initial voltage (start torque) settings. The device supports both constant current start mode and torque control start mode, allowing the installer to select the appropriate starting characteristic for the driven load. The integrated fan cooling system ensures proper heat dissipation even at high continuous current ratings. The soft starter includes electronic motor overload protection coordinated with the thermal characteristics of the motor, eliminating the need for external overload relays. The device also features phase loss detection, PTC thermistor input for direct motor temperature monitoring, and protection against SCR short circuit.

The 1SFL597001R7011 offers a line starting capability with optional bypass contactor, although the PSR series is designed to operate without an internal bypass, which simplifies installation and reduces panel space requirements. The device accepts control signals of 24 V DC or 110-120 V AC, providing flexibility for integration with existing PLC systems. A RUN relay output indicates motor operation, while a TOP (Top of Ramp) relay output signals that the start ramp is complete and full voltage has been applied to the motor. The soft starter is rated for 700 A steady-state current and can withstand overload conditions according to class 10, 20, or 30 trip curves selectable by the user.

Technical Specifications

• Manufacturer: ABB

• Part Number: 1SFL597001R7011

• Series: PSR Soft Starter

• Rated Operational Current Ie: 700 A

• Supply Voltage: 100 to 250 V AC

• Control Supply Voltage: 24 V DC or 110-120 V AC

• Starting Modes: Constant current, torque control

• Adjustable Start Ramp: 1 to 30 seconds

• Adjustable Stop Ramp: 1 to 30 seconds

• Initial Voltage Setting: 10% to 80% of line voltage

• Overload Protection: Class 10, 20, 30 selectable

• Protection Functions: Phase loss, SCR short circuit, PTC input

• Relay Outputs: RUN, TOP (end of ramp)

• Cooling: Internal fan

• Operating Temperature: -25 to +60 °C

• Degree of Protection: IP20

• Certifications: CE, UL, cUL, CCC

Functional Description

The ABB 1SFL597001R7011 soft starter uses three pairs of back-to-back silicon controlled rectifiers to gradually increase the voltage applied to the motor windings. When a start command is received, the firing angle of the SCRs is initially set to a low conduction angle, producing reduced voltage and limiting starting torque. Over the programmed start ramp time, the firing angle increases until full conduction is achieved and the motor operates at full voltage. This voltage ramp method reduces mechanical shock to the driven load, minimizes wear on gears and belts, and prevents power system voltage dips. During stopping, the soft starter can be configured to apply a decreasing voltage ramp or a soft stop that gradually reduces motor torque, preventing water hammer in pumping applications or load settling issues in conveyors. The internal overload protection uses I²t modeling to protect the motor from thermal damage, with the trip class selected based on motor design and application requirements.

Applications

The ABB 1SFL597001R7011 soft starter is deployed in heavy industrial applications requiring soft start of large AC motors. Typical uses include high-inertia loads such as ball mills, crushers, and centrifuges; pumps and compressors to eliminate water hammer; fans and blowers to reduce belt and bearing stress; and conveyor systems to provide smooth load acceleration. The 700A rating allows this device to control motors up to approximately 500 kW at 230V or 1000 kW at 400V, making it suitable for mining, cement, water treatment, and petrochemical industries. The simple potentiometer adjustment and lack of communication requirements make the PSR700 ideal for standalone applications where advanced networking is not necessary, providing reliable soft starting in harsh industrial environments.