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Setpoint Boost after Lag Pump De-staging
When a lag pump is de-staged (turned off), there can be a sudden drop in pressure in the system due to the pump de-staging.
The Setpoint Boost function will dampen the shock load (pressure dip) to the system by temporarily raising the PI setpoint of
the drive controller during de-staging.
The function will raise the setpoint to the measured feedback value at the time of de-staging for the time set in P3-11. When
the P3-11 time expires, the setpoint will return to the Q1-01 value and the drive operates normally. The intention of the feature
is to get the drive to begin accelerating as soon as a pump is de-staged, thus limiting the shock to the system since the PI
controller would tell the drive to accelerate anyway in response the de-staged pump. It is not intended to regulate at the boosted
setpoint for a long period of time.
• The maximum PI setpoint is limited to the Q1-01 setpoint plus the P3-10 (Max Boost at De-stage) setting.
• This feature cannot decrease the setpoint, therefore the function is disabled if b5-09 = 1 (inverse acting).
• If the iQpump controller calls for a lag pump to be staged during the P3-11 time, the staging will occur with the Setpoint
Boost function being immediately disabled.
• Setting either P3-10 or P3-11 to zero disables the Setpoint Boost function.
• The PI control loop is active during Setpoint Boost.
• The default setting for P3-10 is 0.0 PSI and P3-11 is 5.0 sec.
While the setpoint is being controlled by the Setpoint Boost after De-stage function, the drive will display the message "Setpoint
Boost Active (P3-11)."
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Start Up Procedure
1.
Set all other parameters required for the application such as PI control loop, sleep, motor, and I/O parameters. Refer
to Vertical Turbine Controller (VTC) on page 170 for an example. However, this function can be used in conjunction
across a wide range of applications using a PI control process loop with multiple lag pumps that are staged and de-
staged
2.
Set the maximum Setpoint Boost in parameter (P3-10). This is set in the selected system units (PSI, etc.). When a
de-staging occurs and Setpoint Boost is to occur, the PI feedback level temporarily becomes the PI setpoint. Parameter
P3-10 limits how much the PI setpoint can be raised.
3.
Set the Setpoint Boost time in parameter P3-11. This sets how long the Setpoint Boost function will boost the PI
setpoint. After the P3-11 time expires, the PI setpoint will return to the Q1-01 setting.
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Related Parameters
No. Parameter Name Setting Values
b5-09 PID Output Level Selection
Default: 0
Range: 0, 1
P3-10 Setpoint Boost Maximum at De-stage
Default: 0.0 PSI
Minimum: -20.0
Maximum: 20.0
P3-11 Setpoint Boost after De-stage Time
Default: 5.0 s
Minimum: 0.0
Maximum: 60.0
Q1-01 PID Controller Setpoint 1
Default: 0.0
Minimum: 0.0
Maximum: 6000.0
4.6 iQpump Presets and Functions
176
YASKAWA TOEP YAIP1W 01F YASKAWA AC Drive - iQpump1000 User Manual
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