PS200 Configuration & Operation Guide
OPTIONS & FEATURES
Page 99
setpoint. The smaller the integral time the faster the speed adjustments are made. If the integral time is set too short
speed oscillations may occur, if set too long a prolonged time period is likely prior to achieving the setpoint value.
Parameter
Name
Value/Range
Notes
13.04
I - Time
0-320 Sec
Pressure
[default]
- 0.75
Flow
[default]
- 1.75
DP / Flow [Quadratic] - 3.0
Level & Temp
[default]
- 0.75
RECOMMENDED GUIDELINES
Although there is no tuning procedure that will give optimum results for every system, there are certain guidelines
that will facilitate the tuning process in the event the default settings require adjustment. The following figures
show both normally tuned systems and improperly tuned systems. The first two figures “Normally Tuned” and
“Tuned” show examples of properly tuned systems. Note the second figure, “Tuned” has a better dynamic
response then the first system, but at the expense of a small overshoot in the setpoint. The last two figures show
examples of poorly tuned systems that result in an unstable undesirable response.
-
Normally the default settings for FAST ACCEL and FAST DECEL do not require adjustment unless the drive
response during ramp up or ramp down to the setpoint is unsatisfactory for the particular process.
-
If the default settings result in an unsatisfactory drive response the following rules of thumb can be applied:
x
If rapid oscillations occur about the setpoint try increasing the value of the integral time (parameter
13.04) first. If the oscillations still continue or the time to drop to the setpoint is too long the
proportional gain (parameter 13.03) should also be lowered.
x
If the amount of overshoot is unacceptable increase the integral time and lower the proportional gain.
x
If there is a low offset in the setpoint the proportional gain should be increased.
x
If there is a lengthy time period before achieving the final setpoint the integral time should be
decreased.
x
In level control applications if speed oscillations occur increase the integral time.
-
Once the tuning is fairly close several iterations between the values of proportional gain and integral time
may be required to obtain optimum results.
-
It is important to note that the final values for the proportional gain and integral time should be determined
not only for system changes but also for startup conditions.
Setpoint
Proc
e
ss Var
iable
Time
Normally tuned system
: This system has appropriate gain and integration times resulting in a smooth transition
towards the setpoint.
Summary of Contents for PumpSmart PS200
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