Electro Cam PL-1746 Series - Manual (Page 95)

5-4 Speed Compensation
Leading/Trailing Edge Speed Compensation
Leading/Trailing In the previous example, the response time of the glue gun was the same whether
turning on or turning off. While this applies to many systems, some devices have differ-
ent on/off response times. For these devices the Leading/Trailing Edge feature pro-
vides the ability to program different speed compensation values for the leading and
trailing edges of the pulse driving the device.
Setting If the ON and OFF response times are known, jog the line to determine ON and OFF
Leading/Trailing setpoints at zero speed. Then enter the speed compensation values through SPEED
Speed Comp COMP programming, as described in Chapter 4. When programming SPEED COMP,
enter the leading edge, or ON response time at the “LE” prompt, and the trailing edge,
or OFF response time at the “TE” prompt.
When setting speed compensation on a system where zero-speed edges have
been established, always adjust the speed compensation value. Do not adjust
the individual pulse edges!
Response Times If the response times are unknown, jog the line to determine ON and
Unknown OFF edges at zero speed. Estimate both ON and OFF response times and enter them
through the SPEED COMP function. The leading edge, or “LE” value will control the ON
timing, while the trailing edge, or “TE” value will control the OFF timing. Start the line,
run product through it at a fixed speed, and adjust each speed compensation value
as required for proper gluing. This can be done while the line is in motion. Once pro-
grammed, vary the line speed to confirm proper operation at all speeds, and fine tune
the SPEED COMP values if necessary.
Can’t Be Jogged? If it is impossible to jog the line, run the line at a fixed speed and set the ON and OFF
edges as required with SPEED COMP set to zero for both the leading and trailing
edges. Write down the ON and OFF edges.
Next, increase the line speed and adjust the edges to restore proper gluing. You might
be tempted to adjust speed comp values to do this. However, since the edges were
adjusted at the first speed with zero compensation, any change in compensation value
now will upset the first pair of edges.
Once the second pair of edges is established, calculate separate leading and trailing
edge speed comp values, as shown in the previous example.
Since the new speed compensation value will affect the ON and OFF edges already
programmed, you will need to start the line one more time and, at a constant speed,
adjust the ON and OFF edges for proper gluing. Once set, vary the line speed to
confirm that the speed compensation values are accurately adjusting the edges over
the operating speed range.
(Continued)