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6.2.8 Feedback pulse addition/subtraction setting
Set whether to add or subtract the feedback pulses to/from the deviation counter when the phase A of feedback pulse
proceeds 90 degrees than phase B.
This setting becomes enabled only when "1: Negative voltage is output when the positioning address increases." is set
for "Rotation direction setting" in the switch setting. If "0: Positive voltage is output when the positioning address
increases." is set, the setting value of "Feed back pulse addition/subtraction setting" is ignored.
For the connection between the QD73A1 and the encoder, refer to the following.
Page 66, Section 4.6.2
When the feedback pulses are input, the feedback pulses are added or subtracted to/from the deviation counter (when
"Multiplication setting" is 4).
(1) When a feedback pulse whose phase A is ahead of phase B by 90° is input
(2) When a feedback pulse whose phase B is ahead of phase A by 90° is input
Phase-A feedback pulse
Phase-B feedback pulse
Phase-A feedback pulse
Phase-B feedback pulse
1) When "0: Add when the phase A proceeds 90 degrees than phase B." is set
2) When "1: Subtract when the phase A proceeds 90 degrees than phase B." is set
Deviation counter value
Deviation counter value
Added
Subtracted
01234
5...
0 -1 -2 -3 -4 -5...
1) When "0: Add when the phase A proceeds 90 degrees than phase B." is set
2) When "1: Subtract when the phase A proceeds 90 degrees than phase B." is set
Deviation counter value
Deviation counter value
Subtracted
Added
0 1 2 3 4 5...
0 -1 -2 -3 -4 -5...