Yaskawa iQpump Manual Supplement - Manual (Page 15)

7 Suction Control via Constant Pressure w/Well Draw Down
YASKAWA TM.iQp.10 iQpump Technical Manual Supplement 15
„ Duplex System Example
Pump System Settings
• All pumps have the same flow rate and will alternate
• Lag Pump will track speed of lead pump
• All drives have individual discharge transducers rated 150 psi. Upon failure, system will look to network for feedback
information.
• Suction Transducer is rated 75 psi
• Below 40 psi city pressure the pump system will start to reduce speed until reaching 30 psi
• System Auto setpoint 85 psi, with a 5 psi start level.
Duplex System Example (Related Parameters)
Note: In multiplex mode the network signal for suction pressure can be used. Refer to Transducer Wiring using an External Power
Supply on page 48 .
Example:
A pump system consisting of a duplex domestic pressure booster system using a pressured city supply averaging 40
- 60 psi. If city pressure starts to fall below 40 psi the pump system will start to slow down to reduce the chances of
pump cavitation. When suction pressure (city pressure) drops to 30 psi, the pump system will shut down (sleep) and
wait until city pressure returns, after which the system will automatically start and operate under normal condition.
Parameter Description Booster Pump 1 Booster Pump 2
H3-02 Terminal A1 Gain 231.3% 231.3%
H3-03 Terminal A1 Bias -25.0% -25.0%
H3-08 Terminal A2 Signal 2 2
H5-01 Drive Node Network Address 1 2
P1-01 Pump Mode 3 3
P1-03 FD Device Scaling 150 psi 150 psi
P1-04 Start Level -5.0 psi -5.0 psi
P8-01 WtrLvl/SuctionPres Selection 2 2
P8-02 Suction Transducer Scaling 75 psi 75 psi
P8-03 Suction Pressure Setpoint 40.0 psi 40.0 psi
P8-04 Minimum Suction Pressure 30.0 psi 30.0 psi
P8-05 Wakeup Suction Pressure 40.0 psi 40.0 psi
P9-02 Feedback Source 2 2
P9-05 Lag Drive Mode 2 2
P9-25 Highest Node Address 3 3
P9-50 Suction Pressure Source 2 2
U1-01 Auto Setpoint 85 psi 85 psi