Ransburg AdaptaFlow Node Adapter A10159 - Manual (Page 18)

LN-9217-00.2
AdaptaFlow Node Adapter - Operation
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Sample Amount Sample Amount Sample Amount Sample Amount Sample Amount
This parameter determines the update time that
the PID control loop utilizes to read the flow meter
feedback data. This parameter will have an effect
on how fast the PID loop compensates for
differences in fluid deliveries. The sample amount
is used in a digital filter formula to calculate the
actual rate. The update for the rate will become
slower as this value is increased.
Cutoff Frequency Cutoff Frequency Cutoff Frequency Cutoff Frequency Cutoff Frequency
This parameter defines the minimum frequency
from the flowmeter to assume that the atomizer is
triggered on. This value is entered in hundredths
of Hertz. A typical value would be 50. Note that the
flow controller places itself into the hold mode
when the flow feedback drops below this threshold.
Operating Mode Operating Mode Operating Mode Operating Mode Operating Mode
This parameter tells the flow controller which
operating mode to use.
1 = Monitor Mode
2 = Hard Wired Mode
3 = Node Adapter Mode
PID Integral PID Integral PID Integral PID Integral PID Integral
When the steady-state error is excessive, the
error can be reduced by providing increased
system gain at low frequencies. The integral
compensation signal is proportional to the time
integral of the error, in other words, the integral
correction signal(I) continues to increase a fixed
amount as long as any error is present. When
sufficient correction signal has accumulated, then
the error will have decayed to within the PID
PID PID PID PID
Tolerance Tolerance Tolerance Tolerance Tolerance.
This variable is used more in slow reacting closed
loop systems, where a high proportional (P) gain
would cause instability or oscillation. It is
recommended to keep this value small and make
design changes, if possible, to improve the system
hysteresis. For painting systems, this parameter
will have very little effect and should be set close
to, or at 0.
PID Derivative PID Derivative PID Derivative PID Derivative PID Derivative
The derivative (D) component of the PID formula
effects mostly the transient response and is
proportional to the rate of change, or derivative of
the error signal. Derivative control is useful
because in responding to the rate of change of the
error, it can produce a significant correction before
the magnitude of the error becomes large. This is
particularly useful in controlling systems with
sudden input or load changes because it produces
a control signal while the error is changing.
The derivative part of the PID formula works
against the proportional part if the general direction
is towards the requested value. This is often used
to stabilize the instability introduced by high gain
factors. This factor, like the proportional factor, is
usually adjusted by experimentation.
PID Delta Step PID Delta Step PID Delta Step PID Delta Step PID Delta Step
This parameter defines the difference between
flow rates stored in the color table. This is
expressed in hundredths of Hertz so that a value
of 100 would equal 1.00Hz feedback from the flow
meter. This parameter’s original intent was to
function as a noise filter on a hardwired system,
but may still be used for Node Adapter applications.
A typical value would be 200.
PID Death Delay PID Death Delay PID Death Delay PID Death Delay PID Death Delay
This parameter specifies the amount of time the
system will wait before closing the PID loop after
a requested change in flow rate. The delay initiation
starts from the selection of a new set point input or
a table pick. Note that a table pick is performed
only when there is a change in requested flow rate
and not during trigger on and off. This value
represents hundredths of a second, therefore a
value of 100 would equal 1 second. In some cases
the delay is the best way to make the PID wait for
a steady-state flow.
Volts 2 Offset Volts 2 Offset Volts 2 Offset Volts 2 Offset Volts 2 Offset
The AdaptaFlow 5000 has two analog outputs.
The first analog output is used to drive the flow
transducer. The second analog output is spare
and may be programmed to output any memory
location of the flow controller. This programming
is accomplished by utilizing four different variables:
Volts 2 Offset, Volts 2 Gain, Volts 2 Shifter, and
Volts 2 Pointer. This volts 2 Offset adds a DC
offset to the specified parameter designated by
the volts 2 pointer value. The offset value is in the
range of 0-4095. For current Node Adapter
applications, this parameter should be set to 0.
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