Published: 11/16/2009
| Question: | Should motor cable length be a concern when installing an AC drive?, Is it ok to have a motor 300ft from the drive? |
| Answer: | Yes and yes,
Many papers have been written on the subject of PWM drives and motor cable length considerations.
This FAQ only summarizes Yaskawa's cable length recommendations as it applies to Yaskawa AC drive products.
Yaskawa guidelines:
Some protective actions should be considered. If the leads between the drive and the motor are greater than 50 meters. the high-frequency leakage current will increase, causing the drive output current to increase as well. This may affect peripheral devises. To prevent this, try adjusting the carrier frequency (as shown below). If adjusting the carrier frequency doesn’t work, a load reactor may be required . Motor Cable Length vs. Carrier Frequency
Motor Cable Length -------164ft. (50m) Maximum-------328ft. (100m) Maximum-------More than 328ft. (100m)
Carrier Frequency----------15kHz Maximum--------------10kHz Maximum-----------------5kHz Maximum
See below for additional application data regarding motor cable length:
Application Data # AR.AFD.05
AC Drive/Motor Long Lead Issues
 The benefits of using Variable Frequency Drives (VFDs) include increased energy savings in HVAC applications, improved motor torque and speed control capability and improved motor protection. VFDs have evolved from output schemes that incorporated Darlington pair transistors to today’s industry standard of Insulated Gate Bipolar Transistors (IGBTs). The unique characteristics of IGBTs, including reduced energy loses during switching, have significantly increased VFD drive performance and made possible the smaller packaging designs seen today.
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Product Information:
| Product Group: | Inverters/Drives |
| Product: | E7 Drive, E7B Drive Bypass, E7C Drive Configured, E7E Drive Engineered, E7L Drive Bypass, E7N Narrow Bypass Package, E7S Slim Configured Package, F7 Drive, G5 Drive 600 Volt, G5HHP Drive, G7 Drive, P7 Drive, VS mini |
| Applications: | |
| Category: | Applications; Installation; Motors; Wiring |
Other Information:
| Link to related files: |  |
SAFETY PRECAUTIONS AND INSTRUCTIONS FOR USE OF FAQ INFORMATION!
Please read and understand the product instruction manual before installing, servicing or operating Yaskawa products. FAQ content and illustrations are provided as technical advice to augment the information in manual, not superceed it. It is not possible to give detailed instructions for all types of installation or support activities. The information described in the FAQs are subject to change without notice to improve the product or FAQ. Yaskawa assumes no responsibility for errors or omissions or damages resulting from the use of the information contained in any FAQ.
All warnings, cautions and product instruction for product use must be followed. Installation, operation and maintenance should be carried out by qualified personnel. Failure to observe these and other precautions highlighted in the product manuals will expose the user to high voltages resulting in, serious injury or death. Qualified personnel are defined as individuals who are familiar with the installation, starting, operation and maintenance of Yaskawa products of the type described and have proper qualifications to perform the work.
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