Rockwell Automation 1746-QV,D17466.18 OPEN-LOOP VELOCITY CONTL - Manual (Page 16)

3–6 Setting Up the Software
Publication 1746-6.18 April 1998
LDT
head
For Position Data Increasing Towards LDT Head (Ge:0/15 = 1)
Position
V5 V6 V7 Voltage
Output = 0
past position 1
V2 V3 V4 V1
P7 P6 P5 P4 P3 P2 P1
Speed
Segment 6 Speed
Segment 5 Speed
Segment 4 Speed
Segment 3 Speed
Segment 2 Speed
Segment 1
•
Starting with the ram between P7 and the LDT head (open position),
running the extend profile results in V7 applied to the output.
As the ram passes below P7, V6 is applied to the output, etc.
•
If the ram passes below P1, the output is forced to 0V dc, and the
profile is disabled. You must load new data to operate the profile.
•
Placement operations require two segments.
For example, if P2 = 6.07”, V2 = 1.500V, P1 = 0.00” (or a value
less than P2), and V1 = –1.500V, then the module will place the
ram in the vicinity of P2 (between 6.02 and 6.12). The negative
voltage V1 causes motion to reverse or stop. To see this, enter the
example values for P2, V2, P1, and V1 in the previous diagram.
Position
V3 V2 V1 Voltage
LDT
head
Output = 0
past position 7
Position Data Increases from LDT Head (Ge:0/15 = 0)
V6 V5 V4 V7
P4 P5 P7
Speed
Segment 6 Speed
Segment 5 Speed
Segment 4 Speed
Segment 3 Speed
Segment 2 Speed
Segment 1
P1 P2 P3 P6
•
Starting with the ram between P1 and the LDT head (open position),
running the extend profile results in V1 applied to the output.
As the ram passes P1 towards P2, V2 is applied to the output, etc.
•
If the ram passes P7, the output is forced to 0V dc, and the extend
profile is disabled. You must load new data to operate the profile.