Clean Mode
CLEAN mode can only be initiated if the GUN has been
given a Halt input and is enabled and no faults are active.
Each CHANNEL can be independently configured to accept
the CLEAN command. For two-component GUNs, it may
not be desirable to clean both the resin and catalyst at the
same time, therefore each CHANNEL can be configured
as a “clean” CHANNEL independently by setting the Clean
CHANNELs parameter in the GUN configuration table.
The CLEAN operation can be started one of several ways.
The first method is to simply supply the GUN CLEAN input.
The second method is to initiate the CLEAN mode through
the OPERATOR INTERFACE or host controller (refer to the
appropriate manual). Actual cleaning time and sequences,
including soft air push-out (purge) is performed by the
system controller or the pneumatic interface panel, and
not directly by the fluid flow controller.
The CLEAN mode is terminated when deactivated from
the Operator Interface or when a HALT signal is supplied.
Calibrate Mode
CALIBRATE mode can only be initiated if the GUN is en-
abled and no faults are active. The CALIBRATE operation
is initiated and controlled through the OPERATOR INTER-
FACE or host controller (refer to the appropriate Operator
Interface or Programming manual).
The CALIBRATE mode is terminated when deactivated from
the Operator Interface or if the Enable input is removed.
Recovering From Faults
This section:
• Identify and record the fault
• Evaluate action(s) to be taken
• Perform corrective action(s)
• Reset and run
PID CONTROL
The ransburg DynaFlow Fluid Flow Controller incorporates
a form of a Proportional-Integral-Derivative (PID) algorithm
with additional functions or modifications which are specific
to the efficient control and delivery of materials in paint
spray applications. PID is the most widely used method
for closed loop controllers in all areas of industrial control.
The PID control algorithm develops a control signal com-
posed of three elements. The proportional element is simply
proportional to the difference between the current fluid
flow and the desired fluid flow, referred to as the error. The
integral element of the control output is proportional to the
integral of the error signal, and the derivative element is
proportional to the derivative of the error signal. These are
explained in more detail below. A general understanding of
how a PID controller works will be beneficial in producing
the best overall fluid flow response from the fluid delivery
system. This can lead directly to reduced paint usage and
higher quality of finish.
Largely the air and fluid control components and their
placement with respect to each other determine limitations
on general fluid flow response. This includes the following:
• Type of fluid regulator and needle or diaphragm ratio
(pilot pressure vs. fluid pressure).
• Rheology of the fluid(s) such as viscosity, and shear.
• Length and diameter (volume) of the air pilot lines from
the V/P or I/P transducer to the fluid regulator.
• Back pressures created by fluid control devices such as
the applicator fluid passage restrictions.
Error
The difference between the requested (set point) value and
the actual process being controlled.
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PARTS IDENTIFICATION
Содержание Ransburg DynaFlow 77376
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