FAQ: What are the minimum parameters required to start-up a Sigma II SGDH type servo amplifier for use with a linear motor?
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Pn000.1 Control Method Selection
Set the amplifier to the correct control method (force control, speed control, position control, etc.)
Note: Set Pn000.1=2 for force control
Pn280 Linear Scale Pitch [microns]
Set the linear scale pitch parameter to the scale pitch (i.e. grating pitch or signal period) of the linear encoder. The linear encoder must output a 1Vpp analog sin/cos waveform. The default setting of Pn280 is 0. Alarm A.08 (linear encoder scale pitch setting error) will occur at power-up if this parameter is left at setting 0.
Pn281 Encoder Output Resolution [Pulse/Scale Pitch (Pn280)] - Force/Speed Control
This parameter is used to scale the encoder output resolution from the servo amplifier. The factory setting is 20; therefore, for a linear encoder with a scale pitch of 40 micron (Pn280=40), the encoder output resolution is 20 pulses (Pn281) divided by 40 micron (Pn280), or 1 pulse per 2 microns.
Pn202 Electronic Gear Ratio (Numerator) - Position Control
The Electronic Gear Ratio is used to scale the input position reference. See the following FAQ: How are the Electronic Gear Ratio parameters, Pn202 and Pn203, set for linear motors?
Pn203 Electronic Gear Ratio (Denominator) - Position Control
The Electron Gear Ratio is used to scale the input position reference. See the following FAQ: How are the Electronic Gear Ratio parameters, Pn202 and Pn203, set for linear motors?
Pn483 Forward Thrust Limit [%]
To prevent danger during motor setup, the factory setting of the forward force limit is set low to 30%. Verify that the linear motor is working properly before increasing this value.
Pn484 Reverse Thrust Limit
To prevent danger during motor setup, the factory setting of the reverse force limit is set low to 30%. Verify that the linear motor is working properly before increasing this value.
Pn50A.3 P-OT Input Signal Mapping
The positive overtravel input is factory set to prohibit forward motion. Connect a limit switch to the P-OT input to prevent forward motion beyond the allowable range. The P-OT input can also be disabled to always allow forward motion by setting Pn50A.3 equal to 8.
Pn50B.0 N-OT Input Signal Mapping
The negative overtravel input is factory set to prohibit reverse motion. Connect a limit switch to the N-OT input to prevent reverse motion beyond the allowable range. The N-OT input can also be disabled to always allow reverse motion by setting Pn50B.0 equal to 8.
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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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