Xylem 19 001 300 R2 Silent Storm VFD Pumping System OMRON Touch Screen Display Manual - Manual (Page 35)

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How Do I? 31
– Enter the setpoint in PSI for Lockout #1 in the N20:3 register. A common setpoint is 120 PSI.
– Enter the maximum combo used for Lockout #1 in the N20:4 register.
– Enter the setpoint in PSI for Lockout #2 in the N20:5 register. A common setpoint is 120 PSI.
– Enter the maximum combo used for Lockout #1 in the N20:6 register.
· 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 key.
· Press the down arrow (▼) in the bottom right corner of the screen to open the next
screen, Combo setpoints page 2.
· N21:3 defines the pressure below normal setpoint pressure when the first pump (usually the PM
pump, but not always) starts automatically.
· N21:4 defines the time delay before the first pump starts, once the start pressure is reached. This
is normally set to 0.
For example, if your normal setpoint pressure is 120 PSI and you enter 10 in N21:3, the first
pump comes on at 110 PSI.
· N21:5 defines the pressure above normal setpoint pressure when the first pump (usually the PM
pump, but not always) stops automatically.
For example, if your normal setpoint pressure is 120 PSI and you enter 5 in N21:5, the first
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