Yaskawa iQpump1000 AC Drive Quick Start User 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

Node Address

H5-01 = 1

H5-01 = 2

Highest Node Address

P9-25 = 2

Pump Mode: 3 (Network)

P1-01 = 3

Feedback Source: 0 (Analog)

P9-02 = 0

Lag Fixed Speed

P9-06 = 54.0 Hz

Setpoint

U5-99 = 100 PSI

Start Level

P1-04 = 140 PSI

High Feedback Quick De-Stage

P9-18 = 89.3%

Setpoint Modifier

P9-17 = 5.0 PSI

Add Drive Frequency Level

P9-09 = 59.0 Hz

Add Drive Delay

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

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YASKAWA TOEP YAIP1W 01B YASKAWA AC Drive - iQpump1000 Quick Start Guide