User`s manual

8-10 Motion Mate™ DSM314 for Series 90™-30 PLCs User's Manual – January 2001 GFK-1742A
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The programmed make-up time can be too short for the required distance correction. In this case a
warning error is reported (in the point B of the trajectory), but system continues acceleration up to
the speed, insuring the minimum possible distance correction time . The velocity profile for such
case is shown on the figure 8-12.
Figure 8-8. Follower Ramp Up/Ramp Down Cycle – Case 2 with make-up time too small.
During the ramp phase of the distance correction, the velocity limit is controlled. If calculated
velocity is too high, then the velocity is clamped and warning error code is set (in the point C of
the trajectory). Figure 8-13 shows the velocity profile during the follower ramp cycle for this case.
Figure 8-9. Follower Ramp Up/Ramp Down Cycle - case with active velocity limit.
If the acceleration time (sector BC of the trajectory in figure 8-13) exceeds 128 seconds, then
another warning error will be reported. In this case the distance also will be corrected accurately.
0
Time
Velocity
make-up
time
Follower
Disabled
Make-up
distance
B
C
0
Time
Velocity
make-up
time
Constant velocity
Follower
Disabled
Make-up
distance
B
C
max Vel=0.8*Vlim