FAQ: Why does the SGDH servopack flash "bb" continuously?
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1) The MP-940 24VDC is not connected, or the polarity of the power is reversed
2) The internal protection fuse (FU1) inside the MP-940 has been blown. (Attached please find the fuse specifications, 1.5A required, Cautionary Note: Field replacement of this field could void warranty)
3) The 24VDC power supply could be undersized, and inrush could causes a device to drop out. Keep the following specifications in mind when sizing the power supply:
Continuous power consumption:
MP-940 control power 0.4A
SGDH (400V) control power 1.0A (3.0A surge for 50msec)
(DC motor brakes should be powered by a separate supply to reduce noise)
4) If the MP-940 and SGDH are powered up together and successfuly synchronize but the SGDH subsequently loses control power and has it reapplied while the MP-940 24VDC remains constant, bb will blink.
5) If the MP-940 has been without power for over 24 hours without a backup battery attached, or the program is stored in flash.
Note: Firmware Version in SGDH: 14, MP-940: A05
A fuse Source: http://www.mouser.com
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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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