FAQ: The "sleep" function can only be used when PID is enabled. If an analog (0-10VDC or 4-20mA) signal for speed reference is used, is there any way to use "sleep" without enabling PID?
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Yes. The minimum frequency must be kept at 1.5 Hz, and the "Prohibit Frequency" parameters will need to be used. Set parameter n062 equal to the midway point between 1.0Hz and the desired sleep frequency. Set parameter n064 equal to the difference between the midway point and 1.0 Hz.
Example: A sleep frequency of 20.0 Hz is desired.
20.0 - 1.0 = 19.0
Difference = 19.0/2 = 9.5
Midway point = 1.0 + 9.5 = 10.5 Hz
Set n062 = 10.5 Hz
Set n064 = 9.50 Hz
-*- When starting up, the output frequency will remain at 0.0 Hz until the reference signal reaches a minimum of 20.0 Hz.
-*- With a decreasing frequency reference, the output frequency will level off at 20.0 Hz as the reference descends below 20.0 Hz. When the reference goes below the midpoint (10.5 Hz in the example), the output frequency will then ramp down to 0.0 Hz.
For more information, please see TM4506.
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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 supersede 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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