Xylem 19 001 300 R2 Silent Storm VFD Pumping System OMRON Touch Screen Display Manual User Manual

Page 36

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Omron Touch-Screen Display

the value entered in N21:9 (123 PSI in this example), then the pump is retired.

· N21:6 defines the delay time before the first pump stops once the stop pressure is reached. This

is normally set to between 5 and 10 seconds.

· N21:7 defines the pressure below normal setpoint pressure when the second pump (normally the

first main pump, but not always) will start automatically.

For example, if your normal setpoint pressure is 120 PSI and you enter 15 in N21:7, the second

pump comes on at 105 PSI.

· N21:8 defines the delay time before the first pump starts, once the start pressure is reached. This

is normally set to 0.

· 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

· To define combos 2 and 3+, press the down arrow (▼) in the bottom right corner of the screen

to display Combo setpoints page 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.

· N21:9 defines the pressure above normal setpoint pressure when the second pump (usually the

first main pump, but not always) will stop automatically.

For example, if your normal setpoint pressure is 120 PSI and you enter 5 in N21:9, the second
pump retires at 125 PSI.

Note:
If this is the first main pump, and it is controlled by a VFD, the value needs to be -2. If station
flow is less than 20 GPM and the station pressure is at the normal setpoint (125 PSI in this
example) the PLC does a speed test to determine whether to shut the pump down. A speed test
means that the VFD slows down to minimum speed. If the station pressure remains at or above

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