Yaskawa G5 Motion Control - Manual (Page 12)

Motion Control
Date: 08/18/04, Rev: 04-08 Page 12 of 22 TM.G5SW.020
P1-09 Positioning Speed
During a motion control move, this is the final speed used during positioning. If over shooting occurs, decrease this
speed.
P1-10 Counts Per Unit
This parameter is a scaling factor for all the parameters using units to measure distance.. The counts per unit, P1-10, are
multiplied by unit value to determine move length in counts.
Setting example: The customer wants to move a machine slide 40.25”. The motor is coupled to a ball screw by a 20:1
reduction gearbox. The screw pitch is 0.5” per revolution. The encoder is rated at 1024 ppr.
• For every 20 motor revolutions, the ball travels 0.5”.
• For 1.0” of ball travel, the motor must rotate 40 times.
• There are 4096 encoder counts per motor revolution. The encoder feedback is in quadrature. This means
that the number of pulses counted by the drive is 4 times the encoder ppr.
• Therefore the encoder will generate 163,840 counts per 1.0” of travel (4096 x 40).
• To set the move resolution (units) at 1.00”, set P1-10 at 163,840 counts
• To travel 40.25”, set A2-xx to 40.25 units.
Setting Range: 0.00 to 100.00 Hz
Factory Default: 0.50 Hz
Modbus Address: 0588 Hex
Positioning Spd
P1-09 = 0.50 Hz
Setting Range: 0 to 65535 Counts
Factory Default: 4096 Counts
Modbus Address: 0589 Hex
Counts Per Unit
P1-10 = 4096