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Chapter 9 Setup
9–15
9-3-3 Setting the pole shift
When the linear motor and linear scale are installed, the linear motor does not know which pole the
permanent magnet is at. Thus, if the linear motor is driven in that state, it may not move or could
runaway. By setting the pole shift amount, the linear motor can be driven correctly no matter which
pole it is at.
For the pole shift amount, set the data displayed at Rn on the CNC Absolute Position Monitor screen
during DC excitation (while the emergency stop is released).
No. Abbrev. Parameter name Explanation
Setting range
(Unit)
SV028 MSFT Pole shift amount Set the pole shift amount –30000 to
30000 (µm)
The SV028 setting value is validated after the CNC power is rebooted.
(1) For system to which MDS-B-MD is not connected
If the pole shift amount is set, it will be validated after the CNC power is rebooted.
(2) For system to which MDS-B-MD is connected
Normally, the motor is driven with the pole created by MDS-B-MD. However, if this pole shift
amount is set, it will be validated when the Z phase has been passed once after the CNC power
has been rebooted. However, if there is a deviation of 30° or more between the pole before and
after pole shifting, the pole shift amount will not be validated, and instead the 9B warning (Pole
shift warning) will be detected. The motor will be driven with the pole achieved before pole
shifting.
If the 9B alarm occurs, carry out DC excitation again to determine the pole shift amount. The
correct pole shift amount can be achieved even if a value is set in SV028 at this time.