5
PID
DFP-2
To find the electrical center point of pot rotation, use a digital multimeter type ohm meter to measure from
the white wire (wiper), to the red or black wire. Turn the potentiometer shaft until the meter reads 500
ohm. Install the DFP-2 sensor so the meter reading is 500 ohms when the follower arm is halfway
through its travel.
5.3 Dancer Control Setup and Tuning
The control adjustments marked on the label without an underline or box are the only ones needed for
dancer adjustment. Stop Time and Stop Multiplier apply to all operating modes and are not distinctively
marked.
1) Set the following switch and 22-turn potentiometers to the settings given below:
F
switch
PD
P
full
Clockwise
D
mid
rotation
(approximately
11
turns)
CORE
full
Counter
Clockwise
STOP TIME
full
Counter
Clockwise
STOP MULT
full
Counter
Clockwise
2) With the machine running with web, adjust the
POS1
pot to center the dancer arm.
3) Adjust the
D
pot to minimize dancer arm oscillations. The direction to adjust
D
to minimize
oscillations is system dependent.
4) If dancer arm oscillations cannot be eliminated, turn the
P
pot Counter Clockwise and repeat step 3.
Calibration is complete, and the DFC-A is ready for operation.
Optional Adjustments:
Integrator. Many machines run quite successfully after the above adjustments have been made. If the
dancer arm moves too much while the roll changes size, the integrator can be turned on to keep the
dancer centered.
The control adjustments marked with a box apply to a dancer with integrator.
5) Set the
I
pot full Clockwise.
6) With the machine stopped, set the
F
switch to . This turns the integrator on.
7) Run the machine near full roll and at a slow speed and use the
pot to center the dancer.
Clockwise rotation of moves the dancer up, towards an empty dancer condition.
8) Turn the pot Counter Clockwise until the dancer begins to oscillate around the setpoint position.
Then, turn the pot Clockwise until the oscillation stops.
The RUN/STOP input must be used if the integrator is on (
F
switch in position). The RUN/STOP
input should be closed (terminals 9 and 10) when the machine starts its deceleration. The DFC-A keeps
the integrator on until Stop Time expires. Stop Time may be increased by Clockwise rotation of the
STOP TIME
pot. The STOPPED indicator illuminates when the Stop Time has expired. While the
STOPPED indicator is illuminated the DFC-A provides a hold level output that may be adjusted by
turning the pot.
POS2
POS2
I
I
PID
HOLD
