FAQ: What might be the cause of a brake relay chattering (turning on and off rapidly) on a vertical axis?
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The /BK (Brake relay interlock) signal must be mapped to one of three selectable outputs. If multiple functions are mapped to the same output, the signals use OR logic on the output circuit. When mapping the /BK signal, be sure to disable the original mapping to that output.
For example, if it is desired to map /BK to selectable output #1 (SO1), first change Pn50F.2 to'1' (maps /BK to output terminals 25 and 26), and then change Pn50E.0 and Pn50E.1 to '0' (disables the /COIN and /V-CMP output signal originally mapped to the output). If the original mapping is not disabled, then whenever the motor is "in position" the brake relay (wired to output terminals 25 and 26) will release the brake! This is not desireable in vertical applications that are not "self locking".
For futher details on mapping the /BK signal, and setting these parameters, please refer to the Sigma II User's Manual, sections 5.4.4, 5.5.3, and 5.5.4.
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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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