Yaskawa Sigma-5 User Manual: Setup for Linear Motors - Manual (Page 146)

5 Trial Operation (Checking Linear Servomotor Operation)
5.3.3 Motor Phase Selection
5-10
<Example>
Using a linear scale with a scale pitch of 20 μm, if the linear servomotor is moved only 1 cm
by hand in the linear scale’s count direction, the number of feedback pulses will be as fol-
lows:
1 cm/ (20
μm/256) = 128,000 pulses
Note: The actual monitor display will deviate by the error in movement distance only, so a
value that is close to the above value is acceptable.
Note:
• When the Value of the Un00D is incorrect
If the Un00D value is not displayed correctly, the following conditions may be present.
Check the conditions and take appropriate countermeasures.
• The scale pitch of the linear scale does not match.
If the scale pitch set in Pn282 is different from the actual scale pitch, the assumed num-
ber of feedback pulses will not be returned. Check the specifications of the linear scale.
• The linear scale has not been adjusted.
If the linear scale is not adjusted, the linear scale’s output signal level will drop and the
count will not be correct. Check that the linear scale is correctly adjusted. For details,
contact the scale’s manufacturer.
• The wiring between the linear scale and serial converter unit is not correct.
If the wiring is not correct, a normal count will not be performed. Rewire the devices
correctly.
 Checking the Concurrence between the Linear Scale Count Direction
and the Linear Servomotor Forward Direction
Next, move the moving coil by hand in the direction of the side along the cable, and
check that the Un00D monitor is counting up.
Note: When the Value of the Un00D is counted down
When the value of the Un00D is a counted down, set the parameter Pn080.1 = 1 (Sets
phase B lead as phase sequence of U, V, W). Enable the setting by turning OFF the
power and then ON again.
When the linear servomotor is moved by hand to the side along the cable and the value of
Un00D is 128000, it is confirmed that the SERVOPACK received the signal correctly.
Linear servomotor cable
attached to the moving coil
When the linear servomotor is moved by hand to the side along the cable,
if the value of Un00D is a countup value, confirmation is completed.
Linear servomotor cable
attached to moving coil