Xylem 19 001 300 R2 Silent Storm VFD Pumping System OMRON Touch Screen Display Manual - Manual (Page 37)

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How Do I? 33
the value entered in N21:9 (123 PSI in this example), ,then the pump is retired.
Note:
The second (and higher) main pump is normally not controlled by the VFD. Therefore, the value
in N21:13 is usually set to 30 PSI. In the case of multiple VFDs, the value would be -2.
· N21:10 defines the delay time before the second pump stops, once the stop pressure is reached.
This is normally set to 10 seconds.
· N21:11 defines the pressure below normal setpoint pressure when the third pump (normally the
second main pump, but not always) starts automatically.
For example, if your normal setpoint pressure is 120 PSI and you enter 15 in N21:11, the second
pump comes on at 105 PSI.
· N21:12 defines the delay time before the third pump starts, once the start pressure is reached.
This is normally set to 0.
· N21:13 defines the pressure above normal setpoint pressure when the third pump (usually the
second main pump, but not always) stops automatically.
For example, if your normal setpoint pressure is 120 PSI and you enter 5 in N21:13, the first
pump retires at 125 PSI.
Note:
The second (and higher) main pump is normally not controlled by the VFD. Therefore, the value
in N21:13 is usually set to 30 PSI. In the case of multiple VFDs, the value would be -2.
· N21:14 defines the delay time before the third pump stops once the stop pressure is reached. This
is normally set to 90 seconds.
· Tap the value field next to any of these registers and the calculator/keypad pops-over the screen.
Enter or edit the value. (See also, Calculator/Keypad .)
Note:
Use the values defined for combo 3 when the number of combos exceeds 3.
· Optionally, press the Main Menu touch key to return to the Main Menu. (See also, Main Menu .)
· Optionally, press Back to return to the Register Access screen.
· Press press the down arrow (▼) in the bottom right corner of the screen to display
Combo setpoints page 4.
Three auxiliary setpoints can be used and set up on page 4, Aux Setpoints screen.