Yaskawa iQpump1000 AC Drive Quick Start - Manual (Page 205)

A triplex irrigation booster system has one PM Pump (pressure maintenance) and two larger booster pumps of the same
horsepower. The customer would like to ensure that the PM Pump is also the lead pump to recharge the system during low
flow usage, but during high demands the booster pumps alternate on each run cycle or if required will both run to support very
high flow demands.
• Jockey/PM Pump will also be lead to start.
• Jockey/PM Pump will stage booster pump 1 or 2 and stay running for 20 seconds and then shut off.
• Booster pump 1 will run system and if required, call for booster pump 2 or vice versa.
• On sleep mode, the lead drive for starting will swap back to Jockey/PM Pump.
• System setpoint 100 PSI.
• Pressure drop of 10 PSI will start the Jockey pump.
• All drives have individual transducers rated 200 PSI maximum, but if there is a transducer failure, switch to network.
Triplex Irrigation Booster System Related Parameters
Table 4.15 Related Parameters
Parameter No. Parameter Name PM Pump Booster Pump 1 Booster Pump 2
H5-01 Drive Node Address 1 2 3
P1-01 Pump Mode 3 3 3
P1-03 Feedback Device Scaling 200 PSI 200 PSI 200 PSI
P1-04 Start / Draw Down Level -10.0 PSI -10.0 PSI -10.0 PSI
P9-01 Lead Drive Selection 2 2 2
P9-02 Feedback Source 2 2 2
P9-07 Lag Fixed Speed Delay 20 s 5 s 5 s
P9-20 Allow Network Run 2 0 0
P9-21 Run Priority 7 8 8
P9-24 Lead Swap at Sleep 0 s 1 s 1 s
P9-25 Highest Node Address 3 3 3
U5-99 PID Setpoint Command 100 PSI 100 PSI 100 PSI
n De-Scale/De-Ragging
The De-scale/De-ragging function attempts to clean the pump impellers (dislodge scale and buildup) by rapidly starting and
stopping the pump in both directions. The drive monitors the number of operating hours of the motor and after a set amount
of operating time, the drive runs the De-scale/De-ragging function the next time the drive is started in either the HAND or
AUTO mode.
The De-scale/De-ragging function runs the drive forward, then reverse for a specified number of times before normal operation
will automatically resume.
The De-Scale/De-ragging function operates when all of the following conditions are met:
• P8-01 = 1: De-Scale is Enabled
• P1-01 ≠ 3: Not in MEMOBUS Multiplex
• P7-01 = 0: Anti-Jam Disabled
De-Scale/De-Ragging Operation
While the pump is running in the Hand or Auto mode, the De-scale/De-ragging run timer is activated. The timer data is stored
in EEPROM at power-down. If the amount of time accumulated in the timer is less than the De-Scale Pump Run Time parameter
(P8-08), the drive starts normally. When the timer is equal to or greater than the P8-08 value, the drive will automatically
perform the de-scale function the next time the drive is at a stop and is commanded to accelerate in HAND or AUTO mode.
The “De-Scale/De-rag Active” alarm will flash on the keypad during the De-scale/De-ragging function. The drive will first
accelerate using the De-scale Acceleration Time (P8-06) up to the De-scale Run Frequency Reference (P8-03), for the De-
scale Forward Run Time (P8-04) time. It will then decelerate using the De-scale Deceleration Time (P8-07) and accelerate
using P8-06 in the reverse direction. It will stay running at the P8-03 speed for the time set in the De-Scale Reverse Run Time
(P8-05). After the timer expires, drive will decelerate to zero using P8-07. Once it reaches zero speed, it will immediately
repeat the cycle for as many times as specified by the De-scale cycle count (P8-02) parameter. If the De-scale/De-ragging
function is interrupted by a fault or by removing the run command, all timers associated with the De-scale/De-ragging function
will be reset.
During de-scaling / de-ragging operation, the following features are disabled:
• PI Control (pressure control)
• Thrust Bearing Acceleration
• Minimum Speed
4.5 iQpump Presets and Functions
YASKAWA TOEP YAIP1W 01B YASKAWA AC Drive - iQpump1000 Quick Start Guide 205
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Start-Up Programming & Operation