Positioning User Manual
10
1.5.2
Bias Speed (Address “1-2”)
Bias speed refers to the initial speed of the positioning operation.
Considering that torque of a stepping motor is unstable when its initial speed is almost at 0, the
initial speed (bias speed) has to be set during early operation in order to facilitate motor’s
rotation and to save positioning time.
Bias speed should not be entered over the selected speed limit value.
1.5.3
Speed Limit (Address “3-4”)
Speed Limit means the allowable maximum speed that can be set in the positioning operation.
Positioning operation speed cannot be configured greater than the value set as the Speed Limit.
1.5.4
Acceleration / Deceleration Time (Address “5-8”)
Acceleration Time: a duration required to reach from “0 (Stop)” speed to the max. Speed Limit.
Using bias would be a time consumed to reach from Bias Speed to the Speed Limit.
Deceleration Time: a duration required to reach from the Speed Limit down to “0 (Stop)” speed.
Using bias would be a time consumed to reach to Bias Speed configured in parameter.
The actual Acceleration / Deceleration Time can be calculated by the formula shown below.
T = V x Ta / (Vmax – Vbias)
(V = Target speed change, Ta = Acc/Dec time, Vmax = Speed Limit, Vbias = Bias Speed)