4
SECTION I: INTRODUCTION
Using this Manual
This manual contains information about the PowerScout
™
3, PowerScout
™
18, ViewPoint Software and the RS-
422/485 to Serial Adapter. For ease of use, this manual has been divided into five sections. The list of sections
and their contents follows:
Section I
Introduction
Section II
The PowerScout
™
Section III
ViewPoint
™
Software
Section IV
Configuring the RS-422/485 Adapter
Section V
Appendix
PowerScout Overview
The PowerScout
™
watt-transducers are made for the non-revenue submetering market. Each meter is made to
monitor the voltage, current, power and energy of a single three phase system. The PowerScout
™
meter uses
direct connections to each phase of the voltage, and uses current transformers (or Rogowski coils) to monitor
each phase of the current. Energy, demand, power factor, line frequency, etc. are derived from the voltage
and current inputs.
The communication interface to the unit is through an RS-422/485 serial connection that uses the Modbus
protocol for sending commands and retrieving data. A separate remote terminal unit (RTU), Data Logger, or
Building Management and Control System is usually connected to the PowerScout to provide for data
recording and trend logging and any human interface or display.
Up to 41 PowerScout
™
18 meters (249 PowerScout
™
3 meters) may be connected to a single RTU for
monitoring and recording power usage at multiple locations within a single site.
The PowerScout
™
18 (PS18) consists of six independent three phase metering elements labeled “A” through
“F” in the drawing below. Each metering element has provision for three current transformers (CTs), one for
each phase. In this way, the PowerScout
™
18 can measure six independent three-phase loads.
The voltage reference is made on the power supply board as shown below. The single connection point for the
voltages is common to all six of the watt metering elements. Therefore, though six independent three phase
loads can be monitored by a single PowerScout
™
18 all six loads must have the same voltage source, e.g., be in
the same panel. To monitor multiple voltage sources, for example, 480/277V and 208/120V loads across a
transformer, two PowerScout
™
18’s will be needed, one for each voltage source.
Shop for Power Metering products online at:
1.877.766.5412
www.
PowerMeterStore
.ca
