Nor-Cal IQ+ Adaptive Pressure Controller - Manual (Page 16)

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IQ+ OP-LIT 9/08
6.1 - How to Configure IQ+ for your System
System Configuration Parameters
There are three parameters to adjust that will affect how the valve will react
to changes in gas flow and pressure set points.
The parameters only need to be set once and will cover the full range of pro-
cess pressure setpoints. The three parameters are:
volume
Delay
Speed
Volume
Volume is a Dependent phase multiplier and is based on the size of the pres-
sure chamber and controls how fast the valve will react.
No specific relationship to physical chamber size (example: a setting of 50
does not equal a 50L chamber).
The default setting for volume is 0. Range is 1-100.
If the pressure signal over shoots the set point, increase the value of volume.
FIGURE 6.1 – vOLUmE TOO LOW
If the pressure signal under shoots the set point, decrease the value of
volume.
FIGURE 6.2 – vOLUmE TOO HIGH
FIGURE 6.2 .1– vOLUmE TOO HIGH
Delay
Feedback delay compensates for the physical properties of the vacuum
system that cause delays in the pressure gauge readings when a pressure
change occurs.
Keep the Delay setting as low as possible.
The default value of Delay is 0. Range is 0-10.
If Delay is adjusted, it should be set as low as possible.
If the pressure signal oscillates at set point then increase Delay.
FIGURE 6.3 – DELAy TOO LOW
Speed
The default setting for Speed is 100 (100%). Range is 1-100. Normally
this parameter does not require adjustment.
Reducing speed will help reduce low frequency oscilations. Speed
should be reduced only after any adjustments to volume and Delay
have failed. When reducing Speed, set Delay to 0..
Maximum valve speed during pressure control does not affect the
Open-Close, or Close-Open valve speed. If Speed is set too high the
pressure will oscillate at set point (See Fig. 6.4). If Speed is set too low
the valve will move slowly (See Fig. 6.5).