Xylem IM255 AQUAVAR Intelligent Pump Controller - Manual (Page 83)

NOTE: Before beginning the No Flow Power Calibration Process ensure the Sleep
Frequency/Low Limit [4-12] and the Motor Speed High Limit [Hz] [4-14] are set. These
parameters are set as part of the Motor Setup.
NOTE: For the most accurate No-Flow Power Calibration data, run the setup after the
system has reached normal operating temperature.
WARNING:
The No Flow Power Calibration Process requires the pump to be operated at no flow. This
can produce high pressure within the system. Ensure the system piping and components
are designed to withstand the suction pressure plus shutoff head pressure produced by
the pump prior to starting the calibration process.
Select Enabled to begin the No Flow Power Calibration Setup.
The first screen prompts to ensure the Sleep Frequency/Low Limit [4-12] and Motor Speed
High Limit [4-14] have been set. If these points are not set the No Flow Power Calibration
will not operate properly.
The next screen prompts to close all discharge valves and to press [Hand On] to begin the
No Flow Power Calibration process. Doing this ensures the pump will operate at no flow/
shutoff. If the pump does not operate at no flow during the setup, the calibration data will
be invalid.
The controller will now begin running the pump while monitoring the power. In the first
two steps the pump is operated at 85% of maximum speed defined at Motor Speed High
Limit [Hz] [4-14] and the power to the pump is monitored and saved. The pump then
operates at 50% of maximum speed and the power is monitored and saved. The no flow
power curve is then constructed within the controller based on these 2 points using the
affinity laws.
The No Flow Power Calibration Set-up is now complete. The power data can be saved by
pressing [OK] and then the down arrow. If any issues were encountered during the
calibration process discard the data by pressing [Cancel] and repeat the calibration
process.
Operation
Aquavar ® Intelligent Pump Controller INSTRUCTION MANUAL 81