Xylem IM043 AQUAVAR Variable Speed Pump Control - Manual (Page 55)

Refer to the overall Program Flow Chart for the location of the following operator custom features.
To access a particular feature:
• Enter the password (66) at the Main Menu.
• Scroll to the selected feature by using the “ ” key.
Other features have already been discussed in the application set-up instructions described
earlier.
Jog-Mode
This display shows the actual frequency the pump is running at and the signal being read by the
pump’s transducer. The frequency (speed) can also be manually changed by using the up or down
arrow keys. When leaving the Jog Mode, the pump will automatically return to normal operating
speed unless you have set 0.0 for the frequency setting (this sets the AQUAVAR controller to “off”).
Window
The AQUAVAR controller regulates motor speed in very small increments, allowing the pressure to
rise and fall within a range around the set point. This range is called the “window.” The size of
this window can be set as a percentage of the set pressure.
For example, if the set pressure is 100 PSI and the window is set at 10%, the swing in
pressure would be 10 PSI (5 PSI above the set pressure and 5 PSI below the set pressure)
during operation. This large a swing would probably become noticeable as motor cycling
or surging. This setting should be adjusted according to the required value. Lower required
values should use about 10% and higher required values should use about 5%.
Ramp Hysteresis
This setting tells the AQUAVAR controller what portion of the operating window should be set
aside for electrical fluctuations in the system (Hysteresis). Part of this built-in inaccuracy is due to
the pressure transducer and part is due to the inverter drive. Typically, this would be set at 50%.
In a 4 PSI window, 2 PSI would be the expected hysteresis error. This is also the point at which
the AQUAVAR changes over to the long slow ramps.
Ramp Settings
The next four displays relate to the time it takes for the AQUAVAR controller to speed up and slow
down the motor when pressure or flow requirements change. In normal operation, these
should not be changed. Please carefully read the descriptions for the ramp speeds.
54
Operator Custom Features and Displays
Custom features are pre-programmed to default settings. These settings are the
same for all horsepower sizes and may require adjustments to meet the particular
pump system and horsepower requirements.
Note
*