YASKAWA iQpump1000 User Manual page 184

4.6 iQpump Presets and Functions
u
MEMOBUS Multiplexing Application Examples
n 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 at fixed speed of 54.0 Hz.
• Setpoint is 100 PSI, feedback scale is 145 PSI, start level is 80 PSI.
Description
Run Source: 1 (Terminals)
Node Address
Highest Node Address
Pump Mode: 3 (Network)
Feedback Source: 0 (Analog)
Lag Fixed Speed
Setpoint
Start Level
<1> All other multiplexing and alternation parameters are set to default settings.
n Duplex System with Fine Tuning Application Example
The customer would like to solve a pump cycling problem. Currently the second drive runs for 10 to 20 seconds at minimum
speed then shuts 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)
184
RUN
S1
SN
Drive A
15 HP
+V
A1
A2
AC
R+ R- S+ S-
Figure 4.20 Simplified Wiring Diagram
Table 4.10 Related Parameters for Simple Duplex System Example
RUN
S1
SN
+V
A1
A2
AC
R+
<1>
Drive A
b1-02 = 1
H5-01 = 1
P9-25 = 2
P1-01 = 3
P9-02 = 0
P9-06 = 54.0 Hz
U5-99 = 100 PSI
P1-04 = 80 PSI
YASKAWA TOEP YAIP1W 01F YASKAWA AC Drive - iQpump1000 User Manual
Drive B
15 HP
R- S+ S-
<1>
Drive B
b1-02 = 1
H5-01 = 2
P9-25 = 2
P1-01 = 3
P9-02 = 0
P9-06 = 54.0 Hz
U5-99 = 100 PSI
P1-04 = 80 PSI