Rockwell Automation 20A PowerFlex 70EC/700VC User Manual
Page 70
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Position Indexer/Speed Profiler
Time Blend - When started the drive will ramp to the desired velocity and hold
speed for the programmed time at which point it will transition to the next step and
ramp to the programmed velocity without going to zero speed.
The example below shows a five step profile. The first three are Time Blend steps
followed by an Encoder Abs step to zero then an End step. For each Time Blend
step the drive ramps at [Step X AccelTime] to [Step X Velocity] in the direction of
the sign of [Step X Velocity]. The [Step X Value] is programmed to the desired time
for the total time of the accel and run of the step. When the value programmed in
[Step X Value] is reached, the profile transitions to the next step. The absolute step
is used to send the profile back to the home position. This is done by programming
[Step 4 Value] to zero.
Timed Steps Blended
Digital Input - When started, the drive will ramp to the desired velocity and hold
speed until the digital input programmed in the value transitions in the direction
defined. When this occurs, the profile will transition to the next step and ramp to the
programmed velocity without going to zero speed.
The example below shows a six step profile. In each step, the drive ramps at [Step X
AccelTime] to [Step X Velocity] in the direction of the sign of [Step X Velocity]
until a digital input is detected. When the input is detected it transitions to the next
step in the profile. This continues through DigIn6 activating step 5. Step 5 is
defined as a Parameter Level step. Digital Inputs used in the profile must be defined
as “Prof Input.”
Step # Step X Type
Step X
Velocity
Step X
AccelTime
Step X
DecelTime
Step X
Value
Step X
Dwell
Step X
Batch
Step X
Next
1
Time Blend
100
0.5
0.5
5.00
0.00
1
2
2
Time Blend
200
0.5
0.5
5.00
0.00
1
3
3
Time Blend
300
0.5
0.5
5.00
0.00
1
4
4
Encoder Abs 400
0.5
0.5
0.00
1.00
1
5
5
End
N/A
N/A
0.5
N/A
0.00
N/A
N/A
35
55
75
95
115
135
-9
1
11
21
31
41
51
5s
5s
5s
Time
-150
-250
-350
-450
50
-50
150
250
350
Step 1
Step 2
Step 3
Step 4
Step 5
[Encoder Speed], 415
[Units Traveled], 701
Current Step
[Profile Status], 700
15
Note: there is no "At Position"
indication when using
timed steps
En
c
o
d
e
r Sp
e
e
d
Units Traveled
Profile Status (Scaled)
Current Step