What is the ABB PSTX720-600-70 Softstarter?
The ABB PSTX720-600-70 is a three-phase softstarter rated for 720 A inline operation across a 208...600 V AC voltage range. It combines voltage and torque ramp control with a built-in bypass, making it a complete solution for medium to large motor starting applications.
Engineered for engineering-grade precision, this model carries the ABB type designation unit and product ID 1SFA898118R7000. Its rated control supply voltage spans 100...250 V AC at 50/60 Hz, while the control circuit operates at 24 V DC.
Key Technical Specifications
- Rated operational voltage: 208...600 V AC, accommodating diverse supply systems.
- Rated operational current (inline): 720 A; inside delta connection reaches 1247 A.
- Rated control supply voltage: 100...250 V AC, 50/60 Hz for global compatibility.
- Rated control circuit voltage: 24 V DC for reliable logic-level control.
- Starting capacity: 4xIe for 10 seconds, handling heavy-duty starts.
- Analog outputs: 0…10 V, 0…20 mA, 4…20 mA for precise signal integration.
- Degree of protection: Main terminals IP00 per IEC 60529.
- Ambient air temperature: Operation -25...+60 °C; storage -40...+70 °C.
These verified parameters ensure exact matching to your motor and network requirements.
How Does the Built-In Bypass Improve Reliability?
The integrated bypass reduces thermal stress on thyristors during continuous running. Consequently, energy losses drop and service life extends. This design eliminates the need for external bypass contactors, simplifying panel layout and reducing wiring complexity.
Additionally, the softstarter provides comprehensive protection functions including electronic overload, current imbalance, phase reversal, and locked rotor protection. These features address common failure modes such as voltage sags and underload conditions, safeguarding motors and driven equipment.
Comparison with Conventional Softstarters
- Integrated bypass: unit includes built-in bypass; many conventional units require external contactors.
- Communication: Built-in Modbus RTU plus optional ANYBUS modules for Profinet, Profibus, Modbus TCP, Ethernet IP, and others.
- Control methods: Voltage or torque ramp with current limit, kickstart, and pump cleaning functions.
- Display: Detachable full graphic display with IP66 and 4x outdoor rating for harsh environments.
- Motor compatibility: Supports inline (720 A) and inside delta (1247 A) connections for medium to large motors.
Applications and Use Cases
Typical applications include pumps, fans, compressors, and conveyors. In pump systems, the pump cleaning function prevents clogging, while torque control reduces water hammer. For conveyors, the kickstart feature overcomes static friction during startup. Similarly, compressors benefit from current limit to avoid supply disruptions. Fans leverage soft stop to minimize mechanical wear.
Installation and Setup
Mount the softstarter vertically with adequate clearance for cooling. Connect main circuit bars with a tightening torque of 45 N·m. Control circuit wiring accepts rigid conductors up to 1 x 2.5 mm². The detachable display allows remote mounting for convenient parameter access. For fieldbus integration, confirm gateway or connection module requirements with AutoDCSTech.
Maintenance and Reliability
Periodic inspection of cooling fans and terminals is recommended. The built-in thyristor runtime measurement and event log support predictive maintenance. Operating within the specified ambient range of -25...+60 °C ensures consistent performance. The IP00 main terminals require installation in a protected enclosure.
Availability & Condition at AutoDCSTech
| Part Number | PSTX720-600-70 |
|---|---|
| Availability | In Stock |
| Condition | New |
| Warranty | One Year |
| Origin | Switzerland |
