Technical Specifications

FAQ

1. What is the main function of the ABB PSE370-600-70 soft starter?
The ABB PSE370-600-70 is designed to control the starting and stopping process of three-phase AC motors. Instead of applying full line voltage immediately, it gradually increases the motor voltage during startup, helping reduce starting current and mechanical stress. The soft starter also supports controlled stopping through a configurable ramp. With a rated operational current of 370 A and an operating voltage range of 208–600 V AC, it is suitable for medium- and high-power industrial motor applications.

2. What motor applications are suitable for the PSE370-600-70?
The PSE370-600-70 is suitable for general-purpose three-phase motor applications where controlled starting and stopping are required. Typical applications include pumps, fans, compressors and conveyors. It can be particularly useful where direct-on-line starting would produce excessive inrush current, mechanical shock or pressure fluctuations. The actual motor suitability should be determined from the motor rated current, starting characteristics, load profile and required starting frequency.

3. How is the motor current configured on the PSE370-600-70?
The rated motor current can be adjusted within approximately 30–100% of the soft starter’s rated current. For the PSE370-600-70, the maximum rated operational current is 370 A. The motor’s actual nameplate current should be entered or configured according to the application rather than simply using the maximum device rating. Correct current configuration is important because the electronic overload and motor protection functions rely on the configured motor data.

4. What starting functions are available on the PSE370-600-70?
The PSE370-600-70 provides soft-start control with an adjustable starting ramp and initial starting voltage. The start ramp can be configured from approximately 1 to 30 seconds, while the initial starting voltage can be adjusted within the applicable range. A current-limit function is also available and can be set within approximately 1.5–7 times the rated current. A kickstart function can provide additional starting torque when required by loads with higher initial resistance.

5. Does the PSE370-600-70 provide motor protection?
Yes. The PSE370-600-70 incorporates electronic motor overload protection and additional protection functions such as underload and locked-rotor protection. These functions help monitor abnormal motor operating conditions and can initiate protective action when configured limits are exceeded. Correct motor current settings and appropriate protection parameters are important for reliable operation. Protection settings should be selected according to the motor characteristics and the requirements of the driven machine.

6. Does the PSE370-600-70 have a built-in bypass function?
Yes. The PSE370-600-70 includes an integrated bypass function. Once the motor has completed the starting process, the bypass reduces the power losses associated with the semiconductor switching components during normal full-speed operation. This can improve operating efficiency and reduce heat generation inside the soft starter. The bypass also simplifies installation because an additional external bypass contactor is generally not required for the basic bypass function.

7. What communication and signal interfaces are available on the PSE370-600-70?
The PSE370-600-70 supports built-in Modbus RTU communication for integration with industrial control and automation systems. It also provides relay signals for operating status, bypass status, fault conditions and overload conditions. In addition, a 4–20 mA analog output is available for transmitting relevant operating information to an external monitoring or control system. Hardwired control inputs can also be used for functions such as start, stop and fault reset.

8. What are common causes of PSE370-600-70 starting faults?
Common causes include incorrect motor-current settings, excessive starting load, insufficient supply voltage, incorrect control wiring, unsuitable ramp settings, excessive starting frequency and motor or mechanical faults. A locked rotor or excessively high starting torque requirement can also cause the soft starter to reach its current limit or trigger protection. When troubleshooting, check the motor nameplate data, configured current, incoming supply, control signals, ramp parameters and mechanical load. The diagnostic indicators and fault information should also be reviewed before changing operating parameters.