YASKAWA SGD7S-*A20**F62 Series Product Manual

Contents

3.1 Outline3-23.1 OutlineTriggers at preset positions are signals that are output when a moving part of a machinepasses preset reference positions. You can use this function to set signal outputs for up to 32positions.The following image shows the operation of triggers at preset positions.*1. For triggers at preset positions to function, the speed must be constant for at least 250 μs before the machinepasses a preset position.*2. When you set the output width of a signal output at a preset position as a distance, use a distance that doesnot exceed the point where deceleration of the constant speed starts.You can use both high-speed outputs that output signals from line drivers and normal outputsthat output signals from photocouplers for triggers at preset positions. They can also be usedtogether.Output circuit specifications for the line-driver and photocoupler output are given below.Triggers at preset positions are enabled by performing one of the following steps.Absolute EncoderSend the Turn Sensor ON command (SENS_ON: 23 hex) from the host controller.Incremental Encoder• Send the Zero Point Return command (ZRET: 3A hex) from the host controller.• Use the Set Coordinates command (POS_SET: 20 hex) from the host controller to set a refer-ence point (REFE = 1).• If you use triggers at preset positions when the rotational coordinate system is enabled (i.e.,Pn87A or Pn87C is not set to 0), set the output position so that it falls between Pn87C (FirstRotational Coordinate) and Pn87A (Last Rotational Coordinate). Refer to the following chapterfor details on the rotational coordinate system.Chapter 4 Rotational Coordinate SystemFeedback position (APOS)*1Not activeActiveNot activeActiveOutput time or output distance fortrigger at preset position 1Output position compensation fortrigger at preset position 1Trigger at preset position 1Trigger at preset position 2Output position fortrigger at preset position 1SpeedTimeOutput position fortrigger at preset position 2*2Output position compensationfor trigger at preset position 2Output time or outputdistance for trigger atpreset position 2Important