Electro Cam Plus PS-6144 Series, Programming & Installation Manual

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4-3 Speed Compensation
Setting Speed Comp In many applications, speed compensation can be set by jogging the line to determine
ON and OFF setpoints at zero speed, then entering the speed compensation value into
the controller. In the previous example, the line would be jogged until the leading edge
of the box reaches the gun at 110° of transducer rotation. The glue gun output would
be set to turn on at this point. Then, the line would be jogged until the trailing edge is
under the gun at 360°, and the glue gun output would be set to turn off.
Once these on and off setpoints are entered, the glue system response time of 15 msec
would be entered through SPEED COMP programming as described in Section 3. As
line speed increases, the PS-6144 will automatically advance the setpoints to maintain
the accuracy of the glue bead position.
When setting speed compensation on a system where zero speed setpoints have
been established, always adjust the speed compensation value. Do not adjust the
individual output setpoints!
Response Time Suppose that in the previous example, the response time was unknown.
Unknown To set up the machine, jog a carton through the machine and set the glue gun ON and
OFF setpoints as described earlier. Then, estimate a response time and enter it into the
controller using the SPEED COMP function described in Section 3.
Start the line and run cartons through it at a fixed line speed. Program SPEED COMP to
adjust the
speed compensation value as required for proper gluing. This can be done
while the line is in motion. Once programmed, vary the line speed to confirm proper
operation at all speeds, and fine tune the SPEED COMP value if necessary.
Can’t Be Jogged?
Some machinery can’t be jogged to determine ON and OFF setpoints. To set up this
type of equipment, start the line, run cartons through it at a fixed line speed, and set
the ON and OFF setpoints as required for proper gluing. Write them down for reference
in the next step. SPEED COMP should be set to zero.
Next, increase the line speed and adjust the
setpoints to restore proper gluing. You
might be tempted to enter a speed compensation value to do this. However, since the
setpoints were adjusted at the first speed with zero compensation, any change in com-
pensation value now will upset the first pair of setpoints.
Once the second pair of setpoints is established, compare them to the first pair that
you wrote down. Establish a ratio of degrees the setpoints advance versus the speed
as shown in Figure 24. Convert this ratio to response time and enter it as the speed
compensation value.
Figure 23—Speed Compensation at Various Speeds
Standard Speed Comp (Cont’d)
(continued)