Positioning Near Output Signal (/Near); Speed Limit Detection Signal (/Vlt) - YASKAWA SGDV series User Manual

4 Operation

4.6.7 Positioning Near Output Signal (/NEAR)

4.6.7

Positioning Near Output Signal (/NEAR)

Before confirming that the positioning completed signal has been received, the host controller first receives a
positioning near signal and can prepare the operating sequence after positioning has been completed. The time
required for this sequence after positioning can be shortened.
This signal is generally used in combination with the positioning completed output signal.
Type
Output
Note: Use parameter Pn510.0 to allocate the /NEAR signal for use. Refer to 3.4.2 Output Signal Allocations for details.
Pn524
The positioning near signal (/NEAR) is output when the difference between the number of references output
by the host controller and the travel distance of the servomotor (position error) is less than the set value.
Note: Normally, the value of Pn524 should be larger than that for the positioning completed width (Pn522).
4.6.8

Speed Limit Detection Signal (/VLT)

This function limits the speed of the servomotor to protect the machine.
A servomotor in torque control is controlled to output the specified torque, but the motor speed is not con-
trolled. Therefore, if an excessive reference torque is set for the load torque on the machinery side, the speed
of the servomotor may increase greatly. If that may occur, use this function to limit the speed.
Note: The actual limit value of motor speed depends on the load conditions of the servomotor.
Motor speed
Maximum speed
Refer to the following parameters for speed limit.
4-52
Signal Connector
Name Pin Number
/NEAR Must be allocated
NEAR Signal Width
Setting Range Setting Unit
1 to 1073741824 1 reference unit
Reference
Motor speed
Pn524
Position error
0
/NEAR
/COIN
With No Speed Limit
Danger of damage due to
critical speed.
Time
Setting
The servomotor has reached a point near to
ON (closed)
positioning completed.
The servomotor has not reached a point near
OFF (open)
to positioning completed.
Factory Setting
1073741824
Motor speed
Time
Pn522
Time
Effective at ON (close).
Time
Effective at ON (close).
Time
With Speed Limit
Motor speed
Limiting speed
Meaning
Position
Classification
When Enabled
Immediately Setup
Safe operation with
speed limit.
Time