Yaskawa iQpump Manual Supplement - Manual (Page 16)

7 Suction Control via Constant Pressure w/Well Draw Down
16 YASKAWA TM.iQp.10 iQpump Technical Manual Supplement
„ Enabling Suction Pressure Control
The suction pressure control selection is added to parameter P8-01 Water Level/Suction Pressure Selection. Follow these
steps for basic suction pressure control setup:
1.
Enable suction control by setting parameter P8-01 to 2 (Suction Control).
2. Set suction transducer scaling (P8-03) in psi, scaling for analog input A1 (20 mA scale).
3.
Set suction pressure setpoint (P8-03) in psi.
4.
Select iQpump operation when a drop in suction pressure occurs:
a. Regulate outlet pressure only and go to sleep immediately when suction pressure falls below minimum suction
pressure level (P8-04). Set suction pressure setpoint (P8-03) below minimum suction pressure level (P8-04).
b. Regulate suction pressure when pressure is below suction pressure setpoint (P8-03) but above the minimum
suction pressure level (P8-04). Set suction pressure setpoint (P8-03) to above the minimum suction pressure level
(P8-04).
5.
Set minimum suction pressure (P8-04) – Sleep Level for Suction Control.
6.
Set suction pressure wake-up level (P8-05) – Wake-up level.
7.
Set suction control minimum speed (P8-06) – Minimum Flow Speed.
P8-01 Water Level/Suction Pressure Selection
Sets the mode of operation for the Water Level / Suction Control function.
Note: The iQpump Controller will only perform the outlet pressure and suction pressure control when "normal" PI mode is enabled
(b5-01 > 0, not jogging, not disabled via MFDI, etc.).
P8-02 Suction Transducer Scaling
Terminal A1 is used for the suction pressure analog input. The analog pressure sensor, mounted on the inlet side of the
pump(s) will provide the required signal. Set this parameter to the full-scale pressure of the transducer. The suction
pressure will then be displayed on the U1-98 monitor.
P8-03 Suction Pressure Setpoint
P8-04 Minimum Suction Pressure
Setting Description
0 Disabled (factory default)
1
Water Level Control
(This function is defined as "Enabled" for iQpump software PRG: 0034)
2 Suction Pressure Control (New)
Range Description Default
5 - 500 psi
Sets the full scale (20 mA) output of the pressure transducer connected to
Terminal A1.
100 psi
Range Description Default
0.0 - 1200.0 psi
Sets the amount of suction pressure the iQpump Controller will attempt to
regulate.
20.0 psi
Range Description Default
0.0 - 1200.0 psi
When the suction pressure drops to below this level for more than the P2-03
time, the drive will go to sleep and turn off all lag pumps.
10.0 psi