E-Cam Curve - Delta ASDA Series Application Notes

Introduction of E-Cam Operation

2.5 E-Cam Curve

When E-Cam is engaged and receiving pulses from the master, the slave axis will operate
according to the setting of E-Cam curve. On ASDA-A2, E-Cam can be applied as long as the
pulse from the master axis and position of the slave axis is a one-to-one relation.
Position (PUU)
Slave
E-Cam curve can be created by ASDA-Soft or macro parameters. Although E-Cam curve can be
created in several ways, the only way for ASDA-A2 is to store the angle of E-Cam and
corresponding position on slave axis in data array.
ASDA-A2 can save 800 data in total; a single curve can have 721 data at maximum (720
divisions). Therefore, as long as the total data is below 800, multiple E-Cam curve data can be
saved. Data amount of E-Cam is stored in P5-82. And the data of the first E-Cam curve that
saved in data array is specified by P5-81. When data array has saved multiple data of E-Cam
curve that can be specified by P5-81 and P5-82.
See Figure 2.19 for example. To replace a machine cam with E-Cam curve, the first step is to
equally divide the cam. In this example, the real cam is divided into 8 equal parts thus the angle
of each part is 360/8 =45°. The second step is to figure out distances between center of the cam
and its edge. Then, put these values into data array. In this case, this data presents the position
of the slave axis. The start position (0°) and destination (360°) shall be the same, and both data
shall be put in data array so as to present a complete cycle of a cam. Therefore, there are 8+1 =
9 points in data array. When P5-81 = 50 and P5-82 = 8 (8 divisions), E-Cam curve (position of
the slave axis) will be stored at the address from 50 to 58. When using this curve, the system will
access E-Cam's position and its corresponding angle based on the setting of P5-81 and P5-82.
Users may use E-Cam editor of ASDA-Soft to manually create a table and write the data to data
array.
2-14
。 。 。 。 。 。 。 。
0 0 45 45 90 90 135 135 180 180
Figure 2.18 E-Cam Curve
。 。 。 。 。 。 。 。
225 225 270 270 315 315 360 360
ASDA Series Application Note
Pulse
。 。
Master
March, 2015