Yaskawa iQpump Controller Programming Manual - Manual (Page 181)

YASKAWA TM.iQp.07 iQpump Controller Programming Manual 181
Figure 1.131
Figure 135.
◆ P3-08 Multi Pump Setpoint Decrease
Setting Range: 0.0 ~ 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 136. 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)
Figure 1.132
Figure 136.
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
Time
SET-POINT
Set-Point - 2 x P3-08
Set-Point - P3-08
PUMP 1 PUMP 1 + 2 PUMP 1 + 2 + 3 PUMP 1 + 2
Set-Point - P3-08
PUMP 1