PS200 Configuration & Operation Guide
OPTIONS & FEATURES
Page 98
Tuning
If the pump appears to oscillate in speed (i.e. hunting), cannot maintain a uniform setpoint, has a constant
setpoint offset, or shuts off too quickly or too slowly it may need to have the integral time or proportional gain
settings tuned to the system.
When an operating mode is selected [i.e., flow, pressure, level etc.] PumpSmart engages factory default settings
for the rate that the drive adjusts to meet the setpoint demand. In many cases these settings will not require
adjustment. The most common exceptions are complex systems, process instruments with slow response times,
large full-scale value compared to setpoint or level control applications where variables such as tank size have a
significant effect on tuning response.
When the PumpSmart system is adjusting speed to meet the setpoint, it does so using a Proportional Gain and
Integral Time (PI) setting. The proportional gain setting adds corrective action that is proportional to the difference
between the setpoint and the process condition. This difference is commonly referred to as error. A low gain
setting will yield a small corrective action that may stabilize at a position that is offset from the setpoint.
Conversely, if the gain setting is too high, speed oscillations may occur.
The integral time setting makes corrective actions to compensate for the offset created by the proportional
control. The corrective action of the integral function accounts for the error present over a period of time (Integral
Time). The smaller the Integral time, the faster speed adjustments are made, at the risk of speed oscillations
occurring. If the Integral time is set too long, prolonged offsets are likely.
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. For example, a system tuned for system operating
changes may be out of tune during startup conditions.
NOTE - Air in the system may cause a condition that looks like oscillation or hunting. Be sure all air is purged from
the system before attempting tuning.
ACCEL TIME
ACCELeration TIME is the rate at which motor speed is increased when a control correction is required. ACCEL
TIME is expressed as the time, in seconds, it would take to reach maximum speed (parameter 14.01) from zero
speed. In Single Pump and Multipump, the drive response can be made slower by increasing the ACCEL TIME
Parameter
Name
Value/Range
Notes
13.01
ACCEL TIME
0-1800 Seconds
5 [default]
DECEL TIME
DECELeration TIME is the rate at which motor speed is decreased when a control correction is required or upon
shutting down. DECEL TIME is expressed as the time, in seconds, it would take to reach zero speed from maximum
speed (parameter 14.01). As with ACCEL TIME, drive response may be slowed using this parameter.
Parameter
Name
Value/Range
Notes
13.02
DECEL TIME
0-1800 Seconds
5 [default]
PROPORTIONAL GAIN
The PROPORTIONAL GAIN setting adds corrective action that is proportional to the error. A low gain setting will
yield a small corrective action that may stabilize at a position that is offset from the setpoint. A high gain setting
may result in speed oscillations.
Parameter
Name
Value/Range
Notes
13.03
P - GAIN
0-100
Pressure
[default]
- 0.5
Flow
[default]
- 0.2
DP / Flow [Quadratic] - 0.5
Level & Temp
[default]
- 2.5
INTEGRAL TIME
The integral time setting compensates for offset between the process variable and the setpoint. The integral time
produces a rate of change in output speed that is proportional to the deviation in process variable from the
Summary of Contents for PumpSmart PS200
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