YASKAWA iQpump1000 - Page 145

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Simple Duplex System Application Example
A customer requires a duplex system with the following capabilities:
• Control the system pressure using two drives (no PLCs).
• Alternate drives everyday to even out the pump wear.
• Toggle switch for Run command.
• Each drive will have its own feedback transducer. Due to the shut-off valves, the network feedback should not be used as a
backup.
• Pump is at optimal running speed when running at fixed speed is 54.0 Hz.
• Setpoint is 100 PSI, feedback scale is 145 PSI, start level is 80 PSI.
Drive A
15 HP
R+ S+ S-R-
A2
AC
+V
A1
SN
S1
PRESSURE FEEDBACK A
R+ S+ S-R-
A2
AC
+V
A1
SN
S1
PRESSURE FEEDBACK B
RUN
RUN
Drive B
15 HP
Figure 4.21 Simplified Wiring Diagram
Table 4.10 Related Parameters for Simple Duplex System 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 = 80 PSI P1-04 = 80 PSI
<1> All other multiplexing and alternation parameters are set to default settings.
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)
4.5 iQpump Presets and Functions
YASKAWA TOEP YAIP1W 01A YASKAWA AC Drive - iQpump1000 Quick Start Guide
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Start-Up Programming & Operation