Xylem IM043 AQUAVAR Variable Speed Pump Control - Manual (Page 57)

Minimum Frequency
Settings between 0 and 50 Hz are possible. When a minimum frequency is set, the AQUAVAR will
not run the pump below this speed. See the section on submersible pumps.
Config. F Min
This setting allows you to configure a minimum frequency in one of two ways. If you select “f-
>0”, the inverter will go down to the minimum frequency and then continue running at that level
for the delay time (see next features). If there is no demand, the inverter will shut off. It will not
ramp down through lower frequencies.
If the selection is “f->f min” the inverter will slow to the minimum frequency but will not stop
unless there is a fault or an external control is connected to terminals X1/4 and X1/5. Caution:
There is a possibility of pump overheating without automatic shut off.
Stop-Delay F Min
This is the delay time in use if “F->0” is set above. This is set in seconds and will hold the
minimum frequency according to this time delay.
Boost
This setting boosts outgoing voltage to the motor to compensate for the difference between
frequency and voltage as speed changes. This should be set at 5%. Do not change this
under normal operating conditions to avoid overloading the motor. Adjust to 10%
maximum for high starting torque aplications (i.e. submersibles, turbine or cast iron
pumps).
Sensor Adjustment
The AQUAVAR controller can automatically calibrate the sensor (transducer or flow meter). Close
all gate valves around the sensor, turn off the pump, and relieve static pressure so that the sensor
reads zero pressure or flow. Press the up and down arrows at the same time until “ adjusted” is
displayed.
The second sensor adjustment, “ Sensor Curve,” allows control of linear and quadratic sensors.
Use the linear setting for pressure, differential pressure, level, temperature and flow transmitters.
Use the quadratic setting only for constant flow control with orifice plates and differential
pressure transmitters.
The third sensor adjustment, “
Normalize,” allows the maximum pressure or flow rating to be set
for the sensor being used. Refer to the specification sheet for the sensor you are using to deter-
mine the maximum rating at 20mA. Use the up or down arrow to advance to the correct setting.
The standard transducer supplied with the AQUAVAR controller is 25 bar (360 PSI).
Mode
This setting is used to tell the AQUAVAR controller the type of input which will be used to control
the system.
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Operator Custom Features and Displays
If “Out of Range” is displayed, the system is still under pressure and the transducer cannot be calibrated.
Note