Pulse Number - Delta ASDA-A3 Series User Manual

ASDA-A3

10.3.2 Pulse number

When the motor is running in the clockwise direction, the number of revolutions is defined as a
negative value. When the motor runs in the counterclockwise direction, the number of
revolutions is defined as a positive value. The range of the countable number of revolutions is
between -32,768 and +32,767. AL062 occurs once the overflow of number of revolutions occurs
(which means the number exceeds the range). To clear the alarm, you must re-establish the
absolute origin position. If P2.070 has been set not to show the AL062 alarm, then the system
ignores the overflow of number of revolutions.
If the motor is operating in the counterclockwise direction and the number of revolutions
reaches 32,767, the value jumps to -32,768 once the motor reaches the target position in the
next turn, and the value keeps increasing from -32,768 to +32,767. If the motor is operating in
the clockwise direction and the number of revolutions reaches -32,768, the value jumps to
+32,767 once the motor reaches the target position in the next turn, and the value keeps
decreasing from +32,767 to -32,768.
In addition, there are 16,777,216 pulses (0 to 16,777,215) in one revolution. Pay attention to the
motor's running direction. You can read the number of revolutions and the pulse number within a
single turn with either communication or DI/DO.
Total pulse number = m (number of revolutions) x 1,677,7216 + pulse number within a single
turn (0 to 16,777,215).
The conversions between pulse number and PUU are as follows:
When P1.001.Z = 0: the PUU number when power on = pulse number x
When P1.001.Z = 1: the PUU number when power on = (-1) x pulse number x
Number of
revolutions
P0.051
(16777216-1)
Pulse
0
m = -2
. . .
0 to 16,777,215
0 to 16,777,215
CW
Figure 10.3.2.1 Absolute position for pulse number
m = -1 m = 0
0 to 16,777,215 0 to 16,777,215
Origin
Absolute System
P1.045
+ P6.001.
P1.044
P1.045
+ P6.001.
P1.044
Pulse
number
within
single turn
P0.052
m = 1
. . .
0 to 16,777,215 0 to 16,777,215
CCW
10
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