Yaskawa iQpump Programming Manual - Manual (Page 152)

152 YASKAWA TM.iQp.02 iQpump Drive Programming Manual
Figure 1.115
Figure 120
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P3-08 Multi Pump Setpoint Decrease
Setting Range: 0.0 to 6000.0
Factory Default: 0.0
The iQpump drive can be configured for multiplex pumping operation. The multiplex pumping operation can have the system setpoint
decreased each time a pump is staged (turned ON) by programming the amount to be decreased into the Multi Pump Setpoint Decrease
(P3-08). The system’s setpoint will be raised by this amount when each pump is de-staged (turned OFF). Refer to Figure 121 below.
The units for this parameter are determined by the System Units (P1-02).
Example: Constant Pressure System
System Setpoint: 80 PSI
Pressure Transducer: 150 PSI
Multi Pump Setpoint Increase: 4 PSI
Pump 1 (Running) Setpoint = 80 PSI
Pump 1 + Pump 2 (Running) Setpoint = 76 PSI (80 PSI - 4 PSI)
Pump 1 + Pump 2 + Pump 3 (Running) Setpoint = 72 PSI (80 PSI - 4 PSI - 4 PSI)
Time
SET-POINT
Set-Point + 2 x P3-07
Set-Point + P3-07
PUMP 1 PUMP 1 + 2 PUMP 1 + 2 + 3 PUMP 1 + 2
Set-Point + P3-07
PUMP 1