Xylem IM131R01 AQUAVAR AV II - Manual (Page 64)

Minimum Frequency
Settings between 0 and 50 Hz are possible. When a minimum frequency is set, the AQUAVAR II will
not run the pump below this speed. See the section on submersible pumps, page 44.
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. If a minimum frequency is set and F->0, then
the AQUAVAR will run down to minimum frequency, for the delay time and then shut down. Delay
time is set in seconds.
Sensor Adjustment
The AQUAVAR II controller can automatically calibrate the sensor (transducer or flow meter). Close all
gate valves around the sensor, remove transducer from piping, 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 or Sensor Range,” 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 determine the maximum rating at 20mA. Use the up or down arrow to advance to the
correct setting. The standard transducer supplied with the AQUAVAR II controller is 25 bar
(362.6 PSI).
Mode
This setting is used to tell the AQUAVAR II controller the type of input which will be used to control
the system.
Controller - Used for a single AQUAVAR II controlled pump
Multicontroller - Used where several AQUAVAR II pumps are connected via RS485
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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