FAQ: When an MP940 with a 17-bit encoder is being operated, does the encoder resolution need to be reduced?
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A motor with a 17-bit encoder is capable of producing 131,072 post-quadrature pulses. However, the SGDH amplifier cannot physically reproduce the encoder output pulses at this rate. Therefore, when using a 17-bit encoder with an SGDH amplifier with a wired motion controller (such as the SMC-2000 or a non-Yaskawa controller), the amplifier can output a maximum of 65,536 pulses per revolution to the controller. This value is set with parameter Pn201 as a pre-quadrature value.
When an MP940 controller is used in conjunction with the SGDH amplifier, there are no actual "pulses" sent to the controller. Instead, an encoder value is set in a Dual Port RAM register which is read by the MP940. Therefore, there is no reason to reduce the number of pulses that can be used by the MP940 controller.
When an MP940 controller is used with an SGDH amplifier, the full 131,072 pulses per revolution can be used.
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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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