Warner Electric • 800-825-9050
P-0257-WE • 819-9027
15
D. P-l-D Gain Adjustments
❑
1. ”P” - Proportional gain adjustment, R32
❑
a. Jumper the anti-drift input (terminal
8) to DC common (terminal 9) on the
MCS-203 terminal block to disable the
integrator circuit.
❑
b. Inject a transient into the system by
rapidly changing the dancer position.
Suddenly changing dancer air pressure
or rapidly depressing the web or dancer
arm will provide the transient. Observe
the dancer’s response.
❑
c. The dancer should stabilize within one to
two cycles. If oscillations do not subside,
reduce the “P”gain potentiometer, R32,
CCW in small increments, observing the
effects.
❑
d. Repeat steps b and c above as
necessary until desired response is
obtained.
NOTE: “P” gain settings are a function of brake size.
R32 is factory set at 100% CW. Generally, the larger
the brake, the lower the R32 setting.
NOTE: If response is not obtained with “P” gain
adjustment, it may be necessary to make “D” gain
adjustments as well.
❑
2. ”D” - Differentiator gain adjustment, R16
❑
a. Insure anti-drift (terminal 8) is still
grounded.
❑
b. Inject a transient into the web as
described in step 1b above.
❑
c. If dancer stability is achieved within
one or two cycles, make no further
adjustments.
❑
d. If stability is not achieved, adjust R16 as
follows:
❑
1. If response is erratic and dancer is
extremely jerky, rotate R16 CW.
❑
2. If response is sluggish and dancer
hunts, rotate R16 CCW.
NOTE: If proper response is not achieved with R16
at maximum CW setting, the next higher differentiator
response range should be used.
CAUTION: When switching to higher response ranges,
R16 should be set full CCW.
Factory Settings:
“P” (R32) = 100% CW
“I” (R24) = 60-70% CW
“D” (R-16) = 75% CW
Dip switch #1 on (only)
❑
e. Repeat steps b through d above to
insure optimum response.
NOTE: To insure optimum performance, the system
should be checked at or near full roll diameter.
❑
f. Remove jumper on anti-drift input
(connecting terminal to DC common
terminal 9).
❑
3. T - Integrator gain adjustment, R24.
CAUTION: The”l” gain adjustment controls how far
the dancer must move to compensate
for unwind roll diameter changes. Any
adjustment must be made strictly in
accordance with the instructions below:
❑
a. With the system running and
stabilized, observe the amount of
dancer movement.
❑
b. If the dancer arc is less than 5
degrees and movement is smooth,
do not make any adjustments.
❑
c. If dancer arc is greater than 10
degrees, but movement is smooth,
adjust the “1” gain potentiometer
CW in small increments, observing
the results, until stability is achieved.
❑
d. If dancer arc is within 5 to 10
degrees, but movement is choppy
and rough, adjust the “I” gain
potentiometer CCW in small
increments, observing the results,
until stability is obtained.
❑
4. After completing P-l-D adjustments,
recheck main gain adjustments per steps
C4 through C8.
This completes the start-stop and adjustment of the
MCS-166/MCS-203 Dancer Control System.
If difficulties are encountered which cannot be
resolved using this manual, contact your local
Warner Electric Representative or the factory.
