6
PID
6.3
Dancer Control Setup and Tuning
The controls marked on the label without an underline or box are the only ones needed for dancer
adjustment (see Figure 6). Stop time and Stop multiplier apply to all operation modes and are not
distinctively marked.
1) Set the following switch and 22-turn potentiometers to the settings given below:
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 roll.
3) Adjust the
D
pot to minimize dancer arm oscillations.
4) If dancer arm oscillations cannot be eliminated, turn the
P
pot Counter Clockwise and repeat step 3.
Calibration is complete, and the DFC-90 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 pot full Clockwise.
6) With the machine stopped, set the 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 (switch in position). The RUN/STOP input
should be closed (terminals 17 and 18) when the machine starts its deceleration. The DFC-90 keeps the
integrator on until Stop Time expires. Stop Time may be increased by Clockwise rotation of the
STOP
TIME
pot. The STOPPED indicator lights when the Stop Time expires. While the STOPPED indicator is
lit the DFC-90 provides a hold level current to the clutch / brake. This hold level may be adjusted by
turning the pot.
Stop Multiplier and Stop Time. Even if integrator mode is not used, the
STOP MULT
pot can be used to
increase the torque while the machine is stopping. The increased torque is applied when the RUN/STOP
input is closed (terminals 17 and 18). The length of time the increased torque is applied is adjusted by
the
STOP TIME
pot. Using the stop multiplier feature in dancer mode could cause the dancer to oscillate
while the machine is stopping.
POS2
POS2
I
I
PID
HOLD
I
