It is often wise to include supply voltage monitoring as a useful tool for prolonging motor life expectancy and possible mechanical damage to equipment due to, for example, motors turning in the wrong direction as a result of voltage phase rotation. Essentially, the protection given falls into three categories: the detection of an over-voltage condition; the detection of an under-voltage condition; and the detection of voltage phase rotation on the supply side.
High voltage on a motor tends to push the magnetic portion of the motor into saturation. This causes the motor to draw excessive current in an effort to magnetise the iron beyond the point where magnetising is practical. Low voltage can lead to overheating, shortened life, reduced starting ability, and reduced pull-up and pull-out torque. When the supply voltage is reversed, the connected motor will rotate in the opposite direction and will almost always result in some or other form of mechanical damage.
In conclusion, no stress should be placed on electric motors and other electrical equipment as a result of operating a power system at or near the ends of voltage limits. The best life and most efficient operation usually arise when motors operate at voltages very close to the nameplate ratings.
NewElec offers a variety of products that include protection for supply voltage influence.
High power, high voltage reed relay
Operator Interfaces, Switches & Relays
Pickering Electronics has upgraded its Series 68 high voltage reed relays to include a new variant supporting high power switching up to 200 W.
Read more...Rugged PoE switch built for industrial demands Conical Technologies
Operator Interfaces, Switches & Relays
The Planet IGS-5225-8P4S-12V switch delivers all of this in a compact, rugged and highly efficient design, making it the switch of choice for engineers working in harsh environments.
Read more...Multi-touch panel generation in a smart design Beckhoff Automation
Operator Interfaces, Switches & Relays
Following over 25 years of successful in-house panel production and 12 years of expertise in multi-touch design, Beckhoff is bringing out a new smart panel design, the Next multi-touch panel generation.
Read more...Simple, powerful illumination
Operator Interfaces, Switches & Relays
In applications needing quick, clear communication, the GS60 Pro Multicolour Guide Spotlight delivers powerful, easily configurable illumination and indication to reduce errors and improve productivity.
Read more...Status display for conveying sensor, machine and device data Turck Banner Southern Africa
Operator Interfaces, Switches & Relays
Enhance application accuracy and efficiency with the SD50 Status Display, which conveys sensor, machine and device data via text and multicolour LEDs.
Read more...High performance, low complexity managed switches Industrial Automation & Control (IAC)
Operator Interfaces, Switches & Relays
LEMUR Lite managed switches from Hirschmann deliver full Gigabit Ethernet and PoE/PoE+ support up to 180 W in a cost-optimised, compact design.
Read more...Managed switches for seamless IT/OT convergence Industrial Automation & Control (IAC)
Operator Interfaces, Switches & Relays
Hirschmann IT MAMMUTHUS managed switches enable seamless IT/OT convergence, providing robust security, high scalability and easy network management for industrial environments.
Read more...Compact industrial switches
Operator Interfaces, Switches & Relays
The Hirschmann Bobcat Series delivers high-performance, compact industrial switches designed for real-time communication.
While every effort has been made to ensure the accuracy of the information contained herein, the publisher and its agents cannot be held responsible for any errors contained, or any loss incurred as a result. Articles published do not necessarily reflect the views of the publishers. The editor reserves the right to alter or cut copy. Articles submitted are deemed to have been cleared for publication. Advertisements and company contact details are published as provided by the advertiser. Technews Publishing (Pty) Ltd cannot be held responsible for the accuracy or veracity of supplied material.
printer friendly version