YASKAWA SGD7S-***A20****F62 Series Product Manual page 47

3.1 Outline
3.1 Outline
Triggers at preset positions are signals that are output when a moving part of a machine
passes preset reference positions. You can use this function to set signal outputs for up to 32
positions.
The following image shows the operation of triggers at preset positions.
Feedback position (APOS)
Trigger at preset position 1
Trigger at preset position 2
*1.
For triggers at preset positions to function, the speed must be constant for at least 250 μs before the machine
passes 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 does
not exceed the point where deceleration of the constant speed starts.
Important
You can use both high-speed outputs that output signals from line drivers and normal outputs
that output signals from photocouplers for triggers at preset positions. They can also be used
together.
Output circuit specifications for the line-driver and photocoupler output are given below.
3-2
Speed
Output position compensation for
trigger at preset position 1
Not active
Active
Not active
Active
Triggers at preset positions are enabled by performing one of the following steps.
Absolute Encoder
Send 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 (First
Rotational Coordinate) and Pn87A (Last Rotational Coordinate). Refer to the following chapter
for details on the rotational coordinate system.
Chapter 4 Rotational Coordinate System
Output position for
trigger at preset position 1
*1
Output time or output distance for
trigger at preset position 1
Output position compensation
for trigger at preset position 2
Output position for
trigger at preset position 2
*2
Output time or output
distance for trigger at
preset position 2
Time