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KANAGAWA, Japan, October 21, 2008 -- Oki Electric Cable Co., Ltd. (TSE: 5815) today announced, together with Fanuc Ltd., the two companies succeeded in developing a motor drive cable based on their proprietary cable structure that significantly reduces the impact of conducted noise caused by inverter switching. Compared to conventional servomotor drive inverter cable, the newly developed cable (Product name: Symmetric Motor drive Cable 'SYM Series,' joint patent pending in Japan and overseas) can double the recovery efficiency of conducted noise current. Sales of this product start today.

"We are pleased to unveil the new non-shielded noise-resistant motor drive cable jointly developed by OKI Electric Cable and Fanuc. With our proprietary cable structure, we succeeded in achieving an industry-first high recovery rate of conducted noise current by making the inductance of the ground cable small," said Takashi Hattori, President of OKI Electric cable. "We also take environmental conservation activities seriously, and are developing products without hazardous substances. This cable also bans all six subject substances in Europe's RoHS Directive."

While inverter switching speed becomes faster, conducted noise tend to increase as well. Conventional cables have low noise current recovery efficiency because the ground cable impedance is large, causing peripheral equipment likely to malfunction from conducted noise. To avoid this, in general, thick ground cables or several ground cables are connected in parallel or braided wired and shield cables are applied. However, the coating of shields can be costly, and can degrade the nature of construction because it adds another step for coating and the external diameter of the cables are thick and hard.

The "SYM Series" achieve a noise current recovery efficiency that is equivalent to a shielded cable by reducing the ground cable inductance to a shielded cable level. While the cable is a maximum of 15% thinner, and 20% lighter than that of a shielded cable, the noise current recovery efficiency is equivalent to a shielded cable. Because the SYM Series eliminate the need for shielding, which adds another step when processing the terminal, the cable increases flexibility and significantly improves the nature of cabling construction.

[Major features]

1. Achieves a shielded-cable-like noise current recovery efficiency without using a shielding
2. Cables are 10% thinner(maximum) compared to conventional cables, and 15% thinner and 20% lighter (both maximum) compared to shielded cables
3. Increases flexibility, making it easy to process terminal assembly and improve the nature of construction

[Example of applications]

• Conductor size: 0.75SQ, 1.25SQ, 2SQ, 3.5SQ, 5.5SQ, and 8SQ
• Rated temperature and power voltage: 105degrees and 600V
• Safety rated: UL Subject 758, Style 2501

[External diameter]

Representative example

Conductor size	Cable external diameter
0.75SQ	10.3mm
8SQ	17.6mm

About Oki Electric Cable Co., Ltd.

Established in 1936, Oki Electric Cable Co., Ltd. provides various advanced communications cables, optical cables, and related electronic parts and equipment to the worldwide market. As a member of the OKI Group, Oki Electric Cable Co., Ltd. plays a major role in the group, with the sales of more than 13billion yen. For more information, please visit the Oki Electric Cable website at http://www.okidensen.co.jp/en/

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