YASKAWA iQpump1000 Quick Start Manual page 138

4.5 iQpump Presets and Functions
R un
C omm an d
PID
F eedba ck
Ou tpu t
F requen cy
"Pre-cha rge
Active"
M essage &
D igital Ou tpu t
(H 2-0x = A4)
n
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.
Start Up Procedure
1.
Set all other parameters required for the application such as PI control loop, sleep, motor, and I/O parameters.
to Vertical Turbine Controller (VTC) on page 133
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.
Related Parameters
No.
b5-09 PID Output Level Selection
P3-10 Setpoint Boost Maximum at De-Stage
P3-11 Setpoint Boost after De-Stage Time
138
C om plete via PID F eedba ck (N orm al Acting PID)
P4-01 – Pre-cha rge Le vel
P4-02 – Pre-cha rge F requen cy
P4-03
Pre-cha rge T im e
b5-01 PID Se lect = 1 (Enab led) AND b5-09 Ou tpu t Le vel Se l = 0 (N orm al C ha racter)
Figure 4.16 Pre-Charge Complete via Normal PID Feedback
Parameter Name
P re - C ha rg e
for an example. However, this function can be used in conjunction
Default: 0
Range: 0, 1
Default: 0.0 PSI
Min.: -20.0
Max.: 20.0
Default: 5.0 s
Min.: 0.0
Max.: 60.0
YASKAWA TOEP YAIP1W 01A YASKAWA AC Drive - iQpump1000 Quick Start Guide
Refer
Setting Values