Xylem 19 001 351R2 PACE Integrated Pump Controller Human Machine Interface (HMI) for the Silent Storm VFD Pumping System – User Guide - Manual (Page 25)

Appendix A–Glossary of Terms
The terms used in this manual are defined in the Glossary of Terms. In addition, other industry
specific or product-specific terms are included that may be used by technicians or customer
service when talking about your pumping system.
Across-the-line (XL) Applying 100% of line voltage to a motor during startup and run. A simple
large relay with a contact for each power phase (for 3 phase) is used to
control the motor OFF/ON.
Analog A signal that varies in some respect (voltage, current, frequency) in order to
convey the value of some real world information (i.e. pressure, flow,
temperature etc). A control system can take action based on the value of
such a signal. Internally, the signal will be converted to some number based
on the value of the signal.
Automatic lake screen (ALS) A screen on the intake flume of the pump station, between the
irrigation pond and the wet well, which is designed to be self cleaning by
using a jet of clean water spraying from the inside-out during use.
Booster A pump designed to increase the pressure of a pressurized irrigation line.
This is usually used to move pressurized water from a lower to higher
elevation area of the golf course.
Calibration The act of or specific values used to scale the output of a measurement
device to read real-world values.
Chemical injection The process of adding chemicals to irrigation water to fertilize or medicate
turf grass.
Combo A capacity level representing a predefined group of pumps on a station.
Normally Combos are defined as follows:
Combo 1 Normally the PM pump.
Combo 2 Lead pump. Normally the VSP.
Combo 3 Lead pump and first lag pump.
Combo 4 Lead pump and two lag pumps.
Control valve A valve designed to automatically open/close in order to maintain a specific
setpoint pressure, flow, or level.
Control variable A value that a control system monitors in order to perform some useful
function.
Cycling This condition occurs when conditions require a pump to start if no pump is
running, but require a pump to stop if a pump is running. This is excessive
starting and stopping of one or more pumps and can be damaging to the
equipment if allowed to continue.
Equal HP pumps Also referred to as interchangeable pumps. Defines which pumps are
available to start based on lowest run time. VSPs and XL pumps are defined
in the PLC program. An XL pump can be an equal HP pump, but it will not
start as a lead pump, because the lead pump will always be a VSP.