Yaskawa iQpump Controller User Manual - Manual (Page 259)

G.9 iQpump Software Multiplexing Set-up
YASKAWA TM.iQp.06 iQpump Controller User Manual 259
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Duplex System with Fine Tuning
The customer would like to run the second drive for 10~20 seconds at minimum speed then shut it off, letting the first drive run at maximum. This will
then run the second drive again and the cycle will repeat. The customer must also account for system losses when running both pumps by boosting the
setpoint by 5 psi. In the event that the pressure exceeds 125 psi, the second drive should de-Stage if both drives are running. If the pressure exceeds 140
psi, a high feedback fault should occur and stop the drive.
• Multiple methods of handling the pump cycling problem:
Lower the lag fixed speed (P9-06)
Decrease the lag fixed speed delay (P9-07)
Increase the staging frequency level (P9-09)
Increase the staging delay time (P9-11)
Increase the de-staging delay time (P9-15)
Increase the stabilization time (P9-16)
• Increase both the Add Freq Level and Add Dly Time.
Related Parameters for Duplex System with Fine Tuning Example
Description Drive A Drive B
Run Source: 1 = Terminals b1-02 = 1 b1-02 = 1
Node Address H5-01 = 1 H5-01 = 2
Highest Node Address P9-25 = 2 P9-25 = 2
Pump Mode: 3 = Network P1-01 = 3 P1-01 = 3
Feedback Source: 0 = Analog P9-02 = 0 P9-02 = 0
Lag Fixed Speed P9-06 = 54.0 Hz P9-06 = 54.0 Hz
Setpoint U1-01 = 100 psi U1-01 = 100 psi
Start Level P1-04 = 80 psi P1-04 = 80 psi
High Feedback Level P1-09 = 140 psi P1-09 = 140 psi
High Feedback Quick De-Stage P9-18 = 89.3% P9-18 = 89.3%
Setpoint Modifier P9-17 = 5.0 psi P9-17 = 5.0 psi
Add Drive Frequency Level P9-09 = 59.0 Hz P9-09 = 59.0 Hz
Add Drive Delay P9-11 = 12.0 s P9-11 = 12.0 s
* All other multiplexing and alternation parameters are at default settings.