Ransburg RCS 2 Ratio Control System - Manual (Page 63)

APPENDIX H: FEATHERING
When a gun is configured as a manual mode gun,
the operator has two possible ways of operating
the system. When in manual mode, it is assumed
that handguns are being used.
Pressure Pot Mode: If a value greater than zero
(0) is programmed in for the feather pressure
parameter (on the Config. Job screen), the unit
simulates a pressure pot set to the programmed
feather pressure. That is, it controls the outbound
pressure of the pumps such that the greater pres-
sure of the two (resin or catalyst) always equals
the programmed feather pressure. Therefore,
within the flow limits of the pumps being used and
the ratio selected, the controller will continuously
regulate the outbound pressure of the pumps,
targeting the programmed feather pressure. In
this mode, air flow switches are not required on
the handguns as the system maintains the out-
let pressure to the applicators regardless as to
whether or not it sees trigger signauts. (Note that
air flow switches are still required if the auto-reset
feature is used.) The feather PID parameters
may have to be adjusted to control how fast the
pumps respond to changes in flow. This directly
effects how close to the target feather pressure
the actual outlet pressure is maintained.
Feather Set Mode: If a value of zero (0) is pro-
grammed as the feather pressure parameter (on
the Config. Job screen), the unit operates in feather
set mode. In this mode, a feather set pushbutton
is required to program the feather pressure. This
can be a normally open momentary pushbutton
connected to the feather set discrete input for
the gun (see Appendix E) or, use the feather set
pushbutton on the optional Remote Operator’s
Panel (see Appendix I). Also required in this
mode are air flow switches for each handgun. (It
is not recommended that more than 2 handguns
be fed from each fluid panel as it becomes very
difficult to control flow and pressure while more
than 2 handguns are being triggered and feathered
simultaneously.)
Operating the unit in feather set mode involves
the following steps:
1. Zero (0) psi must be programmed for the feather
pressure parameter under the Config. Job screen.
2. A desired flow rate for each handgun must be
programmed for the parameter Target Flow, under
the Config. Job screen.
3. All handguns should be triggered simulta-
neously and the triggers held wide open. (Air flow
switches must be connected to all handguns, in
this mode.)
4. Press and hold the feather set button to achieve
the desired flow rate for the number of guns trig-
gered. Releasing the button records the feather
pressure.
5. From then on, the operators can spray (and
feather) normally. If the controller can achieve the
target flow rate with both guns triggered without
exceeding the pressure recorded in step 4 above,
it will do so. If, however, the recorded pressure is
reached before it reaches the target flow rate (as
if one or both painters are feathering), then the
RCS-2 controller regulates the flow by targeting
the prerecorded outbound pressure. If only one
gun is triggered, the controller tries to flow at the
target flow rate for one gun, unless it reaches the
prerecorded outbound pressure first, at which time
it again controls flow by targeting the prerecorded
outbound pressure.
RCS-2 User Manual - Appendix
60 LN-9407-00.2
Ransburg