Electrical Noise Mitigation Solutions for Panel Builders

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July 15, 2016 at 12:58 pm  •  Posted in Machine Builder  •  0 Comments

Noise Mitigation:

Electrical noise, or Electromagnetic Interference (EMI), is an area that is increasingly identified as the root cause for system failures. EMI risks increase as a result of competing needs to add more networked components and power devices while attempting to minimize the control panel footprint to reduce panel costs. Too often, Ethernet switches are placed into existing control panel designs without any thought to the damaging effects of poor cable bend radius and exposure to EMI and potentially to radio frequency interference (RFI). These problems can disrupt communications and control functions of the entire automation system and cause the failure of industrial Ethernet installations to deliver on their promise of a robust, reliable and maintainable infrastructure.

The control panels you build support your customers’ efficient operations and infrastructure growth. They also want assurance you can solve their toughest space, noise, environmental, security and safety challenges. Panduit has you covered with a broad range of products, application tooling, technical support and worldwide availability. Our technical experts are ready with the guidance you need, so you’ll spend less time configuring wires — and more time adding value to your product.

Divide and Conquer

The control panel enclosure plays a significant role in controlling EMI. The enclosure is a continuously conductive shell around the internal components that essentially “seals” internally generated EMI in and keeps externally sourced EMI out. However, while the enclosure protects internal circuitry from outside sources, internal circuitry can also create EMI, possibly putting internal devices at even greater risk because of their sensitivity and close proximity to these internal EMI generating sources.

One of the easiest and least expensive ways to prevent EMI from within the enclosure is to lay out the control panel in manner that keeps noisy circuits and devices from potential victim circuits. But to optimize space within the control panels, creating distance is not always an option.

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Relative noise reduction in decibels over frequency range of Panduit® PanelMax™ Shielded Wiring Duct and Noise Shield

To overcome these obstacles, Panduit offers Panduit PanelMax™ Shielded Wiring Duct and Noise Shield offerings which route, separate, and shield sensitive wiring from noise emission. This allows pathways to be place in closer proximity, saving valuable space within the control panel. These shielded solutions provide up to 20dB reduction in noise (EMI/RFI), or 90% noise voltage reduction (NVR), which is equivalent to 6 inches of air spacing between sensitive and noise-emitting wiring. This an ideal solution for control panels operating motors and pumps controlled with VFD or Servo drives.

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Traditionally, the necessary air gap separation between noisy and sensitive cables has required a larger enclosure. PanelMax™ Shielded Wiring Duct and Noise Shield allows pathways to be placed in closer proximity, closing these gaps to enable use of smaller enclosures with a smaller, more cost-effective footprint. In fact, Panduit PanelMax™ Shielded Wiring Duct and Noise Shield reduces panel height requirements by more than 20%. When you combine that with PanelMax™ DIN Rail Wiring Duct that reduces panel width requirements by over 20%, you gain a fully optimized control panel that that offers 40% over space savings worth a net value of between $1,500 and $5,000.

With Panduit PanelMax™ Shielded Wiring Duct and Noise Shield, several wire routing and segregation configurations are possible to deliver greater design flexibility that satisfies a wide range of applications, including retrofit applications or elimination custom fabrication, all while providing a solution with tested and reliable performance.

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