ABB DO801 Analog module industrial system controller

Description

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Improved power loss ride through will improve pumping availability during short power breaks.
The inherent torque control facility for DTC technology allows
the torque to be limited in order to avoid mechanical stress on
pumps and pipelines.
What is the impact of DTC technology on energy savings?
A feature of DTC which contributes to energy efficiency is a
development called motor flux optimization.
With this feature, the efficiency of the total drive (that is controller
and motor) is greatly improved in fan and pump applications.
For example, with 25 percent load there is up to 10 percent total
energy efficiency improvement. At 50 percent load there can be
2 percent total efficiency improvement.
This directly impacts on operating costs. This feature also significantly reduces the motor noise compared to that generated
by the switching frequency of a traditional PWM drive.
Has DTC technology been used in many installations?
Yes, there are hundreds of thousands of installations in use. For
example, one of the world’s largest web machine manufacturers
tested DTC technology for a winder in a film finishing process.
The Requirement:
Exact torque control in the winder so as to produce high quality
film rolls.
The Solution:
Open-loop DTC drives have replaced traditional DC drives and
latter flux vector controlled AC drives on the centre drives in the
rewind station.
The Benefits:
Winder station construction simplified and reliability increased.
The cost of one tachometer and associated wiring equals that
of one 30 kW AC motor. This provides significant investment
cost savings.