Xylem 19 001 300 R2 Silent Storm VFD Pumping System OMRON Touch Screen Display Manual - Manual (Page 40)

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36 Omron Touch-Screen Display
For example, a pump station supplied by city water has an inlet pressure of 50 PSI. The desired
setpoint pressure is 120 PSI. However, you don't want to start your pumps until there is an actual
demand to avoid pump cycling. Therefore, you would want your pumps to start at approximately
45 PSI. This would require your pressure below normal setpoint pressure to be 75 PSI (120 - 45)
for all of your combos. Please refer to the
Change Combo Parameters section of this manual for
the register numbers. Obviously, you cannot have the low discharge pressure set to fault at 95
PSI in this application. It is recommended in this case that N71:0 be set to 90 PSI (120 - 30). This
value would cause the station to fault on low discharge pressure when station pressure dropped
to 30 PSI.
Note:
Never set the N71:0 register to 0, since this would effectively disable your Low
Discharge Pressure fault.
· N70:0 defines the delay time for the Low Discharge Pressure fault. The default value for this
parameter is 300 seconds.
For example, by entering 300 seconds in the N70:0 register, the station pressure would have to
remain below the value entered in N71:0 for 5 minutes before the station would shutdown.
· N71:1 is the pressure above setpoint for the High Discharge Pressure fault. The default value is
15 PSI.
For example, continuing the 120 PSI setpoint example, if the default value of 15 PSI is entered in
N71:1, the station would shut down on a High Discharge Pressure fault when station pressure
rose to 135 PSI.
· N70:1 is the delay time for a High Discharge Pressure fault. The default value is 60 seconds.
For example, the station pressure would have to remain above the value entered in N71:1 for 1
minute (or 60 seconds) before the station would shutdown.
· N70:2 is the delay time for a Low Water Level fault. The default value is 5 seconds. This is an
option is used when probes are placed at a certain depth in the wet well or lake to prevent
excessive draw down.
· N70:3 is the delay time for a Phase Failure fault. The default value is 1 second.
· N70:4 is the delay time for a VFD fault. The default value is 2 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 .)
· Optionally, press the Main Menu touch key to return to the Main Menu. (See also, Main Menu .)
· Optionally, press Back to return to Register Access screen.
· Press the down arrow (▼) in the bottom right corner of the screen to display the Safety
registers page 2.