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5.1 Surface Follower Adjustment Procedure
In a surface follower application, a Line Speed signal from the lead drive is connected to
the Summing Input on the PI module. This speed signal will pass through the module
and be present on the output, which is connected to the speed reference of the follower
drive. The follower drive’s surface speed should then be scaled to match the lead drive
as close a possible. A feedback device, such as a dancer or loadcell, can then be used
with the PI module to trim (slightly add or subtract) to the Line Speed signal to obtain the
desired speed and/or tension (Figure 3).
Step 1: Select Output Type
1. Select the type of output desired using Jumper J2. If a Voltage output is desired,
select V on J2 and use output terminals 7 (OUTPUT) and 8 (VOLTAGE
RETURN). If a Current output is desired, select I on J2 and use output terminals 7
(OUTPUT) and 9 (CURRENT RETURN).
Step 2: Connections
1. Make connections per drawing C13703 on page 19. Initially, there should be no
connection on the Teach input on terminal 12.
Step 3: Initial Setup
1. Initial commissioning should be performed without product in the machine.
2. Set Prop Gain potentiometer fully counter clockwise. Set all other potentiometers
to 8 turns clockwise. If the current positions are unknown or in doubt, rotate
potentiometer counter clockwise 20 turns, then clockwise 8 turns.
3. For dancer systems, verify that the full range of motion of the dancer does not
exceed the allowable electrical range (i.e., the potentiometer does not rollover
from min to max or vice versa).
Step 4: Teach Process Variable (Feedback)
1. The order in which the two extreme feedback levels (minimum and maximum) are
taught determines the logic of the control loop.
2. For Dancer systems, position the dancer at the extreme position that should force
the follower drive to increase in speed. For Loadcell systems, apply either no load
or full load (by hanging weights in the material path) to the loadcell that should
Figure 3: Surface Follower Application Example
Summary of Contents for PI240-000
Page 1: ...Proportional Integral Loop Module Instruction Manual PI240 000 ...
Page 5: ...5 3 2 Signal Connections Figure 2 General Connections ...
Page 17: ...17 4 Prints 6 6 6 6 ...
Page 18: ...18 ...
Page 19: ...19 ...
Page 20: ...20 ...
