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- ABB
- PSE370-600-70
- PSE Softstarter
- Sweden (SE)
- 435 × 190 × 237 mm
- 10.6 kg
- Xiamen, China
- New & In Stock
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Product Overview
The ABB PSE370-600-70 is a high-power softstarter from the PSE Series, used to control the starting and stopping of three-phase motors. It reduces the electrical and mechanical stress associated with direct-on-line starting by controlling the voltage applied to the motor during acceleration.
The PSE softstarter is suited to motor-driven equipment where high starting current, sudden torque, or mechanical shock can affect the motor, driven machine, or connected power network. Typical installations include pumps, fans, compressors, conveyors, and other industrial machinery with substantial motor loads.
During startup, the softstarter progressively increases the motor voltage so that the motor accelerates in a controlled manner. The unit can also manage the motor stopping sequence, making it useful where abrupt removal of power could cause undesirable pressure changes, water hammer, or mechanical shock.
In an existing motor control cabinet, the PSE370-600-70 can be installed as part of a conventional starter arrangement with upstream protection and downstream motor connections. Replacement work should take into account the motor rating, supply conditions, control wiring, bypass arrangement, and configured starting parameters.
Technical Specifications
| Parameter | Specification |
|---|---|
| Product Brand | ABB |
| Product Series | PSE Series |
| Model | PSE370-600-70 |
| Product Type | Softstarter |
| Application | Three-Phase Motor Starting and Stopping |
| Rated Motor Current | 370 A |
| Rated Voltage | 208–600 V AC |
| Frequency | 50/60 Hz |
| Control Method | Electronic Soft Starting and Stopping |
| Dimensions | 435 × 190 × 237 mm |
| Weight | 10.6 kg |
Product Features
- PSE Series softstarter for industrial three-phase motor applications.
- Controls motor acceleration by progressively regulating the applied voltage.
- Reduces the high inrush current associated with direct-on-line starting.
- Limits mechanical shock transmitted to couplings, shafts, belts, pumps, and other driven equipment.
- Supports controlled motor stopping for applications where abrupt shutdown is undesirable.
- Suitable for high-current motor control applications.
- Can be incorporated into conventional motor control cabinets with upstream protection.
- Suitable for pumps, fans, compressors, conveyors, and other demanding motor-driven equipment.
- Supports replacement and modernization of conventional motor starting arrangements.
Working Principle
The PSE370-600-70 uses semiconductor switching devices to regulate the voltage delivered to the motor during starting. Instead of applying the full supply voltage immediately, the softstarter controls the electrical waveform so that motor acceleration occurs progressively.
Three-Phase AC Supply → Motor Protection → PSE370-600-70 → Three-Phase Motor
During startup:
- The motor receives a controlled voltage rather than an immediate full-voltage connection.
- The softstarter progressively increases the applied voltage according to the configured starting parameters.
- Motor current is controlled during acceleration, reducing the severity of the starting transient.
- Motor torque increases as the motor accelerates toward operating speed.
- Once the motor reaches normal operating conditions, the softstarter completes the starting sequence and the motor continues running.
- During stopping, the softstarter can reduce the applied voltage progressively instead of removing the motor supply abruptly.
The result is a smoother transition between stopped and running states, particularly for equipment where high starting torque or sudden speed changes can create mechanical or process problems.
Role in a Three-Phase Motor Control Architecture
The PSE370-600-70 sits between the incoming motor supply and the motor, working with protective and switching components to form a controlled starting system.
Three-Phase Supply → Circuit Protection → Contactor → PSE370-600-70 → Motor
| System Element | Function |
|---|---|
| Main Disconnect | Provides isolation for the motor circuit |
| Circuit Breaker / Fuse | Protects the power circuit against faults |
| Contactor | Provides switching and isolation functions |
| PSE370-600-70 | Controls motor starting and stopping |
| Motor Protection | Provides protection against motor operating faults |
| PLC / Control System | Issues start, stop, and operating commands |
| HMI | Provides operator control and status information |
| Three-Phase Motor | Converts electrical energy into mechanical output |
| Driven Equipment | Performs the required mechanical process |
Industrial Applications
| Application | Typical Use |
|---|---|
| Pump Systems | Controlled acceleration and stopping of centrifugal and process pumps |
| HVAC Fans | Reducing starting stress on large fan motors |
| Air Compressors | Managing motor acceleration in compressor systems |
| Conveyors | Limiting mechanical shock during conveyor startup |
| Industrial Blowers | Smoother starting of high-inertia blower systems |
| Water Treatment | Controlling pump motor startup and stopping |
| Material Handling | Reducing belt and mechanical transmission stress |
| Process Machinery | Managing large induction motor starting conditions |
| Industrial Production Lines | Integrating controlled motor starting into automated equipment |
Installation and Maintenance
- Verify the complete PSE370-600-70 model before installation.
- Confirm that the motor current is suitable for the selected softstarter.
- Verify the motor supply voltage and frequency.
- Check upstream circuit protection and isolation arrangements.
- Isolate all relevant power before connecting or servicing the softstarter.
- Confirm correct phase sequence and motor connections.
- Check control wiring for start, stop, reset, and external control signals.
- Configure the starting parameters according to the motor and driven load.
- Set stopping behavior according to the requirements of the application.
- Check cabinet ventilation and heat dissipation conditions.
- Perform a controlled startup after installation and observe motor acceleration.
- Check motor current and abnormal vibration or mechanical noise during commissioning.
- Inspect power terminals and connections periodically for looseness or overheating.
- Keep records of the configured parameters so they can be restored after replacement.
If the motor does not accelerate correctly, check the motor current, starting parameters, supply voltage, phase connections, and load conditions. Repeated overload or thermal problems should be investigated at the motor and driven-equipment level rather than simply increasing the softstarter settings.
Related Components
| Component | Function |
|---|---|
| ABB Circuit Breakers | Upstream motor circuit protection |
| ABB Fuses | Short-circuit protection where applicable |
| ABB Contactors | Motor circuit switching and isolation |
| ABB Motor Protection Devices | Motor overload and protection functions |
| ABB PLC Systems | Automatic start/stop and process control |
| ABB HMI Panels | Local motor operation and status monitoring |
| ABB Control Relays | Interface between control signals and starter circuits |
| Three-Phase Induction Motor | Main load controlled by the softstarter |
| Motor Cables | Connect the softstarter to the motor |
| Bypass Contactor | Provides an alternative running-current path where required |
Recommended Related Models
| Model / Series | Product Type | Typical Application |
|---|---|---|
| ABB PSE Series | Softstarter | General industrial motor starting |
| ABB PSE18 | Softstarter | Small motor applications |
| ABB PSE30 | Softstarter | Compact motor control |
| ABB PSE60 | Softstarter | Medium motor starting |
| ABB PSE105 | Softstarter | Higher-current motor applications |
| ABB PSE142 | Softstarter | Industrial pump and fan systems |
| ABB PSE170 | Softstarter | High-current motor starting |
| ABB PSE210 | Softstarter | Large industrial motor applications |
| ABB PSE300 | Softstarter | High-power motor control |
| ABB PSE370 | Softstarter | High-current industrial motor applications |
Key Advantages
- Reduces the electrical stress associated with high motor starting current.
- Provides smoother motor acceleration than direct-on-line starting.
- Helps reduce mechanical shock in high-inertia driven equipment.
- Controlled stopping can reduce abrupt changes in mechanical or process conditions.
- Suitable for demanding pump, fan, compressor, and conveyor applications.
- Integrates into conventional three-phase motor control architectures.
- High-current PSE configuration supports substantial industrial motor loads.
- Adjustable starting behavior allows the motor control system to be matched to the driven load.
Technical FAQs
What type of motor is the ABB PSE370-600-70 intended to control?
The PSE370-600-70 is intended for three-phase AC motor starting and stopping applications. It is particularly suitable for industrial motor-driven equipment where direct-on-line starting would produce excessive electrical or mechanical stress.
How does the PSE370-600-70 reduce motor starting stress?
It controls the voltage applied to the motor during acceleration rather than connecting the motor directly to the full supply voltage. The controlled voltage ramp reduces the severity of the starting current transient and produces a more gradual increase in motor torque.
Is a softstarter suitable for a pump that needs controlled stopping?
Yes. Controlled stopping can be useful in pump applications where suddenly removing motor power may produce undesirable hydraulic effects. The stopping behavior should be configured according to the characteristics of the pump and the process.
What should be checked if the motor trips during startup with a PSE370-600-70?
Check the motor rated current, softstarter configuration, supply voltage, motor connections, starting time, current behavior, and mechanical load. If the motor requires excessive torque to accelerate, the driven equipment should also be inspected rather than assuming the softstarter is the source of the problem.