Warner Electric MCS-208 - Manual (Page 15)

Warner Electric • 800-825-9050 P-276 • 819-9045 15
NoTe: This is only a preliminary gain setting. A final
gain setting is required at core diameter for optimum
system performance.
 7. Run the system until the unwind roll is
within two to four inches of core diameter.
 8. If the system has been stable, reset the
front panel gain until the dancer hunting
or oscillation occurs, noting the gain
setting number, then reduce the setting
one or two digits.
NoTe: This is the optimum gain setting. No further
adjustments are necessary.
 9. If system stability cannot be achieve
through front panel gain adjustment, it
may be necessary to adjust gain
factors internally.
Internal P-I-D gain adjustments
should be made only after all other attempts to
achieve system stability have failed. These
adjustments should be made by qualified personnel
only.
NoTe: Internal access is required for the set-up
adjustments which follow. This can be accomplished by
sliding the control module partially out of the housing.
If side panel plate on the control
housing is to be removed, insure the power is off
before removing the control module from the
housing. Failure to disengage power before
removing the module will result in damage to the
control and/or power module.
IMPoRTANT: Follow the sequence outlined below to
properly adjust the P-I-D circuit gains.
D. P-I-D Gain Adjustments
 1. “P” - Proportional gain adjustment, RS32
 a. Jumper the anti-drift input (terminal
8) to DC common (terminal 9) on the
MCS-207 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
jumpered to DC common.
 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 CCW.
 2. If response is sluggish and dancer
hunts, rotate R16 CW.
NoTe: If proper response is not achieved with R16 at
maximum CW setting, the next higher differentiator
response range should be used.
When switching to higher r esponse
ranges, R16 should be set full CCW.
 e. Repeat steps b through c above to
insure optimum response.
NoTe: To insure optimum performance, the system
should be checked at or near full roll diameter.