Mitsubishi Electric QD77MS User Manual page 55

[Pr.304] Servo input axis rotation direction restriction
Set this parameter to restrict the input travel value for the servo input axis to one direction.
This helps to avoid reverse operation caused by machine vibration, etc. when "Real
current value" or "Feedback value" is used as input values.
0: Without rotation direction restriction ............................... Rotation direction restriction is
1: Enable only for current value increase direction ............ Enable only the input travel
2: Enable only for current value decrease direction ........... Enable only the input travel
The input travel value in the opposite direction of the enabled direction accumulates as a
rotation direction restricted amount, and will be reflected when the input travel value
moves in the enabled direction again. Therefore, the current value of servo input does not
deviate when the reverse operation is repeated.
The rotation direction restricted amount is set to 0 when the following operations are
executed for the servo input axis.
• A servo amplifier is connected
• An OPR is executed
• The current value is changed
For "1: Enable only for current value increase direction" is
set in " Pr.304 Servo input axis rotation direction restriction".
Speed before rotation
direction restriction
Md.301 Servo input axis speed
(Speed after rotation
direction restriction)
Md.303 Servo input axis
rotation direction
restriction amount
The input travel value is accumulated as a rotation
direction restricted amount,
the input travel moves in the enabled direction.
2 - 7
Chapter 2 Input Axis Module
not executed.
value in the increasing direction
of the servo input axis current
value.
value in the decreasing
direction of the servo input axis
current value.
and will be reflected when
t
t
t