154 YASKAWA TM.iQp.02 iQpump Drive Programming Manual
If P3-01 = 1: Feedback Level (P3-02: Not Used)
The Pump 3 Frequency Shutdown Level (P3-10) is not used when Lead-Lag Control (P3-01) is set to 1.
If P3-01 = 2: Output Frequency + Feedback Level
The de-staging (turning OFF) of the auxiliary pump occurs when the output frequency falls below the Pump 3 Frequency Shutdown
Level (P3-10) and the difference between the feedback minus the system’s setpoint has exceeded the Shutdown Pump Delta Level (P3-
05) for the time programmed in the Shutdown Pump Delay Time (P3-06).
The auxiliary pumps will be removed by the control of the multi-function digital output contact opening (H2-xx = 40 and 41).
Refer to Lead-Lag Control (P3-01) for further description of the de-staging of the pump system.
■ P3-11 Multiplex Stabilization Time
Setting Range: 0 to 3600 sec
Factory Default: 2 sec
The iQpump drive can be configured for multiplex pumping operation. A time delay can be programmed to allow the system to stabilize
when a pump is staged (turned ON) or de-staged (turned OFF). The time used for system stabilization is programmed into the Multiplex
Stabilization Time (P3-11). When a pump is staged (turned ON), the stabilization time (P3-11) temporarily disables the lead/lag
functionality during this time period to prevent pump cycling.
This function is only active when the Pump Mode (P1-01 > 0) is greater than 0.
Refer to Lead-Lag Control (P3-01) for further description.
Note: The pump protection and lead-lag control are suspended during this time period.
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