Xylem 19-001-350R2 PACE Integrated Pump Controller Human Machine Interface (HMI) for the Silent Storm VFD Pumping System – Technician Guide - Manual (Page 7)

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Figure 1: Basic Operation
TYPICAL PUMPING OPERATION
Several common control variables including flow,
pressure, and level are used for operating an
automatic pumping system. Pump starts and stops
are based on the changes in these control
variables. A VFD (Variable Frequency Drive) is
used to regulate the speed of the lead pump,
replacing the function of a control valve. Pressure
recovery can be made smoothly, resulting in power
and cost savings.
When pressure is used as the key process variable,
the VFD pumping system constantly monitors
pressure to maintain the required demand. Pump
starts and stops are based on the changes in the
system pressure. For example, a pumping system
with one Pressure Maintenance (PM) pump and two
interchangeable main pumps may be grouped into
several different combos (combination of pumps)
that start or stop a specific pump, or a sequence of
pumps, according to defined setpoints.
Each combo has an individual start pressure that
references a setpoint pressure and a start delay
time. At very low demand, the PM pump maintains
the setpoint pressure. Once the demand becomes
greater than the PM pump can handle, the first
combo is activated. The lead pump in this combo is
controlled by the VFD. As demand increases,
additional lag pumps are added, or a different
combination of pumps is activated.
Other configurations are also possible. Consult your
Flownet Technician for proper operation of your
system.
Touch-Screen Panel Operation
This Flowtronex® Pace HMI device manual
describes the operation of the touch-panel display,
located on the enclosure door of the control unit of
the pumping station.
• Use a stylus to tap the buttons or fields
when using the touch-screen panel.
• Use the Enhanced Key Pad to enter
text or numbers in blank fields. Tap
and hold the stylus in a blank field to
open the Enhanced Key Pad pop up
screen.
• A USB Keyboard may also be used
instead of the Enhanced Key Pad.
Plug in the USB Keyboard into the
back of the display.
•
Danger: Electric Shock Hazard
Disconnect power before opening any
electrical enclosure. Any procedure requiring
opening an electrical enclosure must be
performed by qualified personnel only.
Failure to follow this guideline could result in
injury or death.
Figure 2: Connection for USB Keyboard (c).