Normalisation of the velocity
Example 1:
The drive expects 10E-4 revolutions/minute at the velocity interface (SERCOS preferred scaling).
0 | (v_time_base [minutes] | ||
10000 | (v_reso_num [increments] | ||
360000 | ( [0.001 °] |
Example 2:
The drive expects mm/minute at the velocity interface.
0 | (v_time_base [minutes] | ||
1 | (v_reso_num [increments] | ||
1000 | ( [1 µm] |
Example 3:
The settings of SECOS parameters S-0-0044, S-0-0045 and S-0-0046 and an existing gear must be considered to determine the velocity scaling of a SERCOS spindle. As an example, the drive is to use the following scaling and the gear ratio is to be 1:1:
| Velocity data scaling S-0-0044 = 00000000 00001010 |
| Velocity data scaling factor S-0-0045 = 55880 |
| Velocity data scaling exponent S-0-0046 = -9 |
The velocity scaling S-0-0044 is therefore rotational referred to revolutions/minute. With a 1 increment in the velocity interface S-0-0040, the drive therefore rotates at a velocity of
| v = S-0-0045 * 10^(S-0-0046) rpm = 55880*10^-9 rpm |
when referred to 10^-3° this is
| v = 55880 * 360000 * 10^-9 * 10^-3°/min = 20.1168 * 10^-3°/min |
Possible values for the parameters P-AXIS-00205 and P-AXIS-00206 are therefore:
0 | (v_time_base [minutes] | ||
201168 | (distance covered in the time unit specified in P-AXIS-00207 | ||
10000 | (velocity increments output [1 µm] |
To consider a possible gear ratio, this must be entered in the axis parameters P-AXIS-00511 and P-AXIS-00512.