How new motor controllers optimize plant costs and efficiency
Credit to Author: Pierre Dehaut| Date: Wed, 26 Sep 2018 08:00:22 +0000
In a fierce global economy, every industry is focusing on reducing CAPEX while simultaneously increasing plant efficiency and productivity. Though these two goals might seem contradictory, technologies are emerging that can help. A good example is the new generation of electronic motor controllers (MCs) that are changing the way industry is using motors. In this post, we’ll see how these smart MCs can help reduce the total cost of ownership of a plant by impacting everything from electrical design to automation architecture and operations.
Save money by saving space
A simple way to reduce the cost of low voltage equipment is to use smaller electrical devices, which saves on the metal as well as the time to build it. New, more compact motor controllers allow for additional starters per column and less copper for the main power busbar, which is a key cost factor. With a trend toward compact electric devices, electrical panels now require less real estate, which can benefit restricted space applications such as marine offshore platforms or underground subways.
Further space optimization can come from integrating thermal protection inside the circuit breaker. Unfortunately, there is a common belief that having a separate thermal relay is more reliable. However, motor circuit breakers with integrated thermal protection are in reliable use in millions of installations. You may also be asked about an auto-reset function, but the newest electronic MCs also embed this functionality, resulting in a space-saving solution.
Reducing heat dissipation can further decrease space requirements. In the closed, confined space of a panel with airflow often limited by an IP54 rating, the sizing of the panel not only needs to accommodate the product but also its heat dissipation. A standard electromechanical thermal overload relay creates heat proportional to the current, while an electronic MC can cut that heat generation by half. Reduced heat means a more compact panel.
Increase productivity with advanced protection and control
About 35% of the root causes of motor failure are due to thermal overload. The newest smart MCs include advanced protections that can significantly improve operation and reduce unwanted trips by solving up to 55% of motor failures.
For example, integrated over-current protection will help protect valuable mechanical parts such as the gearbox and long start protection will stop a motor if it takes too much time to start. Ground fault protection will anticipate a potential internal short circuit of the motor winding. As an added benefit, a smart MC supports faster diagnosis and predictive maintenance by giving the maintenance team information on the trip name and trip history.
If a motor suddenly stops in a continuous process it can cost thousands of dollars in wasted raw material. An advanced electronic circuit breaker now can create a “clean stop” by sending a pre-alarm to a PLC that can then put the process in a safe shutdown state.
When a breaker trip is unavoidable, a traditional breaker requires a manual reset on the lever to restart. For remote locations like a water treatment plant, it forces an operator to travel a large distance to access the panel. Smart circuit breakers let you remotely open the downstream contactor before the breaker trips, which allows an automatic reset or remote restart.
The TeSys GV4 from Schneider Electric is part of the new generation of smart thermal-magnetic and magnetic motor circuit breakers. Rated up to 55 kW / 100 kA, it offers advanced protections, pre-alarms, low heat dissipation, auto-reset, and remote restart. Click here to learn more about the TeSys GV4 range and solutions that can help protect your entire machine application while improving plant efficiency and maintenance.
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