
B-65150E/04 4. SERVO FUNCTION DETAILS
− 263 −
1737
−
Position feedback switching time constant τ (JITEI)
2126
−
Set this parameter for the main axis only. Set 0 for this parameter for the
sub-axis.
[Valid data range] 0 to 4096
[Method of setting] {1 − exp (−1 ms/τ)} × 4096
[Standard setting] 0
When τ = ∞ : Parameter = 0
When τ = 50 ms: Parameter = 81
When τ = 0: Parameter = 4096
Notes on the position feedback switching function
Reference position return operation and positioning are
performed with the main axis only. Note, however, that during
movement (command ≠ 0), position feedback on the driving side
is used for position control. (A switching time constant is to be
specified with the parameter.)
Adjust the switching time constant if a shock is observed at the
time of position feedback switching.
Basically, the position feedback switching function assumes
setting of semi-closed loop mode.
When the position feedback switching function is to be used with
full-closed loop mode, divide the scale signal into two to apply the
same signal to both the main and sub-sides.
Moreover, set full-closed loop mode for the main and sub-sides as
well.
NC
Separate main
axis
Separate
sub-axis
Feedback cable
Scale
Fig. 4.17.8 (b) Cable on the scale side when the position feedback
switching function is used (full-closed loop)
NC
Separate main
axis
Separate sub-
axis
Feedback cable
Scale
NOTE) It is unnecessary to branch
out.
Enable the full-closed loop feedback sharing function.
Fig. 4.17.8 (c) Example of using the full-closed loop feedback sharing
function together with the position feedback switch function
NOTE
This parameter is valid only when PFBSWC = 1.