Yaskawa iQpump1000 AC Drive Quick Start - Manual (Page 202)

Duplex System with Fine Tuning Application Example
The customer would like to run the second drive for 10 to 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.
There are multiple methods to handle 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
Table 4.11 Related Parameters for Duplex System with Fine Tuning Application Example
Description Drive A <1> Drive B <1>
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 U5-99 = 100 PSI U5-99 = 100 PSI
Start Level P1-04 = 140 PSI P1-04 = 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
<1> All other multiplexing and alternation parameters are set to default settings.
Duplex System with Jockey Pump Example
A customer requires a pump system with the following requirements:
• One small pump (the Jockey pump) will run the system during off-peak times.
• Two larger pumps will run the system when the demand is higher.
• The Jockey pump should not run when the two larger pumps are running.
• Pump wear is still an issue, but it is expected that the small pump will run longer hours and will always run first after a loss
of power.
• The feedback scale is 145 PSI.
• There is only one feedback transducer in the system.
4.5 iQpump Presets and Functions
202 YASKAWA TOEP YAIP1W 01B YASKAWA AC Drive - iQpump1000 Quick Start Guide