Yaskawa iQpump Controller Programming Manual - Manual (Page 172)

172 YASKAWA TM.iQp.07 iQpump Controller Programming Manual
P3 Pump Multiplex
◆ P3-01 Lead-Lag Control
The iQpump drive can be configured for lead-lag control. The lead-lag control refers to the drive (lead) controlling a pump and turning on
auxiliary pumps (lag) by the drive’s output contacts. The controlling of the auxiliary pumps is referred to staging and de-staging. Up to
three (3) total pumps can be operated, one lead (drive control) and two auxiliary pumps. The pump control staging and de-staging can be
controlled by three (3) different lead-lag control methods.
0: Output Frequency
1: Feedback Level
2: Output Frequency + Feedback Level
■
P3-01 = 0: Output Frequency
The “output frequency” control method monitors the drive’s output frequency and determines if the auxiliary pumps need to be staged
(turned ON) to maintain the programmed system’s setpoint. The output frequency also determines when the auxiliary pumps are to be de-
staged (turned OFF). Refer to
Figure 129. and Figure 130. for the staging and de-staging of the auxiliary pumps using the “output
frequency” control method.
Auxiliary Pump Staging (ON)
The staging of auxiliary pump 2 occurs when the output frequency remains above the iQpump drive Multi / Maximum Level (P3-02) for
the time programmed in Add Pump Delay Time (P3-04).
The staging of auxiliary pump 3 occurs when the auxiliary pump 2 is staged and the output frequency remains above the iQpump drive
Multi / Maximum Level (P3-02) for the time programmed in Add Pump Delay Time (P3-04). Refer to
Figure 129. for the staging of the
auxiliary pump 2 and 3 using the “output frequency” control method.
Setting Description Parameters Used
0 Output Frequency ( factory default ) P3-02, P3-04, P3-09, P3-10
1 Feedback Level P3-03, P3-04, P3-05, P3-06
2 Output Frequency + Feedback Level P3-02, P3-03, P3-05, P3-06, P3-07, P3-08, P3-10