YASKAWA iQpump Series Programming Manual page 151

If P3-01 = 2: Output Frequency + Feedback Level
The de-staging (turning OFF) of the auxiliary pump occurs when the output frequency drops below the level programmed in the Pump 3
Frequency Shutdown Level (P3-10) or Pump 2 Frequency Shutdown Level (P3-09) and the difference (delta) between the system's
feedback level minus setpoint has exceeded the level programmed in the Shutdown Pump Delta Level (P3-05) for the time programmed
in the Shutdown Pump Delay Time (P3-06).
The auxiliary pumps will be added by the control of the multi-function digital output contact closure (H2-xx = 40 and 41).
Do not program this level too close to the system's setpoint.
If the level is too close to the setpoint, excessive cycling of the pump system may occur.
P3-06 Shutdown Pump Delay Time
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Setting Range: 0 to 3600 sec
Factory Default: 5 sec
The de-staging (turning OFF) of the auxiliary pumps will occur after the time delay programmed in the Shutdown Pump Delay Time (P3-
06) has elapsed. The time delay will occur prior to de-staging of the auxiliary pumps.
The Shutdown Pump Delay Time (P3-06) works in conjunction with iQpump drive Multi/Maximum Level (P3-02) and Add Pump Delta
Level (P3-03).
Refer to Lead-Lag Control (P3-01) for further description of de-staging of the pump system.
P3-07 Multi Pump Setpoint Increase
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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
increased each time a pump is staged (turned ON) by programming the amount to be increased into the Multi Pump Setpoint Increase
(P3-07). The system's setpoint will be lowered by this amount when each pump is de-staged (turned OFF). Refer to
The units for this parameter are determined by the System Units (P1-02).
Example: Constant Pressure System
System Setpoint: 80PSI
Pressure Transducer: 150PSI
Multi Pump Setpoint Increase: 4PSI
Pump 1 (Running) Setpoint = 80PSI
Pump 1 + Pump 2 (Running) Setpoint = 84PSI (80PSI + 4PSI)
Pump 1 + Pump 2 + Pump 3 (Running) Setpoint = 88PSI (80PSI + 4PSI + 4PSI)
YASKAWA TM.iQp.02 iQpump Drive Programming Manual
CAUTION
Figure 120 below.
151