Soft start offers linear acceleration
An
ABB Automation Tech (LV Products) product story
Edited by the Engineeringtalk editorial team
Apr 5, 2007
ABB's PST soft starter is now also fitted with a programmable analogue output signal, and can be set for a 0-10V, 0-20mA or 4-20mA output.
ABB has added two new features to its PST Softstarter range; torque control and analogue output.
With torque control users can now select between normal voltage ramp and torque ramp for starting and stopping motors.
By selecting the torque ramp for starting, the torque of the motor follows a predefined optimal curve.
This ensures an even smoother start, leading to a more linear acceleration of the motor speed.
For stopping motors using torque control, the voltage is adjusted so that the torque decreases from an operational level down to a value matching the pre-set end voltage, ensuring a smooth stop.
Torque control is especially useful for stopping pumps.
Using the torque ramp a motor can now be brought almost to a complete stop without any water hammering or back flow occurring.
A maximum torque level can also be set on start up using the soft starter.
By setting a torque limit the potentially damaging effect on the motor is couplings or gearbox is minimised.
The PST soft starter is now also fitted with a programmable analogue output signal, and can be set for a 0-10V, 0-20mA or 4-20mA output.
The output readings that can be set represent motor current, motor temperature and main voltage.
By having an analogue output available on the soft starter itself, users no longer need to use a separate current transformer to connect the panel meter.
The analogue signal can be used to feed directly into an analogue meter or a PLC.
With analogue output, users can more effectively monitor the soft starter's activities, such as motor current or power consumption monitoring.
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