Closed Loop Pump Flow Scaling And Calibration - Idex Pulsafeeder MPC Vector Installation, Operation & Maintenance Manual

12. Press the ENTER key to start the motor and advance to the draw down interval count down screen. The default
interval will be 60 seconds. Pressing the ENTER key will take the user immediately to the next screen. Shorter
drawdowns are available using the ENTER key. All other keys abort the calibration.
T
HE MOTOR WILL START WHEN THE ENTER KEY IS PRESSED
PREPARED FOR OPERATIONS BEFORE STARTING THE MOTOR
13. Based upon your drawdown interval and volume dispensed, calculate the low speed calibration flow rate value.
Using the UP and/or DOWN arrow keys adjust the flow to your calculated value.
14. Press the ENTER key to accept the low speed calibration flow rate.
15. At this point,the system will check the calibration values, and if the values are acceptable will complete the
calibration.
8.1.2

Closed Loop Pump Flow Scaling and Calibration

NOTE: Be sure to set flow meter to active. See Section 7.1.2 Analog Input 2 – Flow meter Feedback
Closed loop flow control calibration and scaling requires the following:

Two calibration speeds of user preference, nominally full range (1800 RPM to high speed turndown)

A calibrated flow meter with a flow output signal providing flow feedback, a 4-20mA current signal.

Two flows associated with two these current feedback values (i.e. two calibration points).
o WET flows come from normal running conditions at two speeds.
o DRY flows come from the flow meter ZERO AND SPAN settings
The DRY calibration is the default method - if you know your flow meter ZERO AND SPAN flow rate
Example: If you have a pump with a rated capacity of 20 GPH, configure your flow meter span for 25.0 GPH at
20.0 mA and 0.00 GPH at 4.00 mA, then proceed to the closed loop dry flow calibration and enter these two flow
versus current calibration values. See Figure 8-2 Example Flow Meter Current Output vs. Flow Rate Curve below
as an example of setting your calibration points.
Note: Be sure to set your flow meters span and size your flow meter slightly higher than the rated capacity
identified on the pumps nameplate.
R U N N I N G 6 0 S E C S * *
M O T O R : 1 8 0 R P M
* * 6 0 S E C O N D S W I L L E L A P S E B Y D E F A U L T
F L O W A T 1 8 0 R P M
F L O W : 2 . 5 0
P U M P F L O W
C A L I B R A T E D
42
.
MAKE SURE THAT YOUR SYSTEM IS
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G P H