There are many potential sources of power surges. Two of the most common are spikes from lightning and switching surges.
BREA, Calif. - Oct. 25, 2024 - Voltage spikes are brief events that rarely last more than a few microseconds. In complex systems, however, even seemingly small events can have serious consequences. This is definitely true of industrial automation systems, in which many different devices need to work seamlessly together in order to maintain normal operations. Computers and communications equipment are essential components of many modern automation systems, and they are particularly susceptible to power surges from voltage and current spikes because they typically have low dielectric strength. In these systems, serial device servers are key communications gateways that connect the broader Ethernet network with specific serial devices. A power surge that damages this vital communications link will bring the entire process to a halt. drop out fuse
A voltage spike is a momentary extreme burst of electricity in an electrical circuit. This energy spike may be short-lived, but could still be strong enough to seriously damage the electronics. Voltage spikes cause corresponding spikes in the current impulse. There are many potential sources of power surges. Two of the most common are spikes from lightning and switching surges:
Industrial automation operators generally understand that power surges pose a serious threat to their systems and take steps to reduce this threat. Not only do power surges damage and destroy equipment, they cause costly interruptions. In the case of serial-to-Ethernet communications, irreplaceable historical data could be lost if the serial or Ethernet ports suffer a power surge. For a serial device server, there are three major points of weakness that could be damaged by a power surge: the serial line, the Ethernet line and the power line. Many serial device servers offer surge protection on the Ethernet and power lines to protect against this threat. However, most serial device servers leave the serial line unprotected. As a consequence, the serial line is often the vulnerable chink in a serial device server’s surge protection armor.
Substation automation facilities are at particular risk for power surges because they are highly susceptible to both major sources of voltage spikes. As outdoor facilities, substations are more exposed to lightning strikes. As electric facilities that perform electric transformation and switching, switching surges are also a danger. At the same time, electric substations need reliable serial communications in order to perform essential tasks such as reading power meters. If surge damage occurs on a serial line, then any meter data on the associated line will be lost. This combination of increased risk profile and greater consequences means that robust products with industry-certified surge protection are a must for electric substations.
Surge protection is not an option for vulnerable communications links. Effective and comprehensive surge protection reduces downtime and increases system stability by eliminating the most common cause of failure. IEC 61000-4-5 testing is imperative to verify that a device has sufficient surge protection to withstand voltage spikes. IEC 61000-4-5 Level 1 testing is intended for a device that operates in partly protected electrical environments, while IEC 61000-4-5 Level 2 and higher testing certifies that a device can operate in highly electrical environments.
Many manufacturers offer serial device servers with IEC 61000-4-5 rated surge protection on the power and Ethernet lines. However, the same level of integrated surge protection is rare for the serial line. In order to acquire serial line surge protection, device servers are often deployed with additional external surge protection devices. However, this retrofit adds complexity, increases space requirements, imposes additional maintenance costs and complicates support cases. Industrial automation systems can be complicated enough as it is without an additional requirement to deploy, maintain and support yet another device just to provide serial line surge protection.
Moxa NPort A Series of serial device servers sets itself apart from other solutions with built-in IEC 61000-4-5 rated surge protection on the serial line in addition to Ethernet and power line surge protection. This provides a reliable, resilient serial device server solution in a convenient all-in-one package. With built-in serial line protection, it is no longer necessary to find, test and deploy an external serial surge protection product. Surge immunity on the serial, Ethernet and power lines grants the compact, IEC 61000-4-5 certified Nport A series reliability and full-spectrum protection against voltage spikes and electrical noise.
Moxa is a leader in edge connectivity, industrial computing and network infrastructure solutions for enabling connectivity for the Industrial Internet of Things. With over 30 years of industry experience, Moxa has connected more than 71 million devices worldwide and has a distribution and service network to serve customers in more than 80 countries.
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