Product category:
Drives, motors and power transmission, couplings, clutches
News Release from: ABB Automation Tech (LV Products) | Subject: Motor
Edited by the Manufacturingtalk Editorial
Team on 09 April 2007
Torque ramp ensures smoother start for
motor
To its PST Softstarter range of motors, ABB has added torque control, allowing users to select between normal voltage ramp and torque ramp, and a programmable analog output signal.
ABB has added two new features to its PST Softstarter range; torque control and analog output With torque control users can now select between normal voltage ramp and torque ramp for starting and stopping motors
This article was originally published on Manufacturingtalk on 21 Jul 2006 at 8.00am (UK)
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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 softstarter.
By setting a torque limit the potentially damaging effect on the motor is couplings or gearbox is minimised.
The PST softstarter is now also fitted with a programmable analog 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 analog output available on the softstarter itself, users no longer need to use a separate current transformer to connect the panel meter The analog signal can be used to feed directly into an analog meter or a PLC.
With analog output, users can more effectively monitor the softstarter's activities, such as motor current or power consumption monitoring.
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