Mitsubishi Electric MELSEC Q Series User Manual page 69

For details on "Rotation direction setting" in the switch setting, refer to the following.
Page 101, Section 6.2.1
The connection between the QD73A1 and the encoder varies depending on "Rotation direction setting" and
"Feed back pulse addition/subtraction setting" of the switch setting.
When the rotation directions of the motor and encoder are as below and the motor rotates forward when
Ex.
positive voltage is applied to the servo amplifier
Forward
run
Servomotor
Switch setting
Rotation direction
setting addition/subtraction setting
0: Positive voltage is
output when the
positioning
address increases.
0: Add when the phase A
proceeds 90 degrees than
phase B.
1: Negative voltage is
output when the
positioning
address increases.
1: Subtract when the phase A
proceeds 90 degrees than
phase B.
Reverse Forward Reverse
run run run
Encoder
Feed back pulse
-
CHAPTER 4 SETTINGS AND PROCEDURE BEFORE OPERATION
Suppose the condition of the feedback pulses from the
encoder as: the phase A is ahead of the phase B by 90°
in case of forward run.
Connection
Phase
A
Phase
B
QD73A1
Phase
A
Phase
B
QD73A1
Phase
A
Phase
B
QD73A1
Phase
A
Phase
B
QD73A1
Phase
A
Phase
B
QD73A1
Phase
A
Phase
B
QD73A1
When the rotation
Phase
directions of the motor
A
Phase
and the encoder are the
B
same
Encoder
When the rotation
Phase
directions of the motor
A
Phase
and the encoder are
B
different
Encoder
When the rotation
Phase
directions of the motor
A
Phase
and the encoder are the
B
same
Encoder
When the rotation
Phase
directions of the motor
A
Phase
and the encoder are
B
different
Encoder
When the rotation
Phase
directions of the motor
A
Phase
and the encoder are the
B
same
Encoder
When the rotation
Phase
directions of the motor
A
Phase
and the encoder are
B
different
Encoder
4
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