CONTROLS AND SCADA UPGRADE
FOR WATER SYSTEM
town of salisbury, massachusetts
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Weston & Sampson pianned and designed a complete Controls and SCADA
Upgrade for the Town of Salisbury Water System. Prior to the upgrade, operators
lost sleep during every storm worried that controls would fail or they would have
to rob one panel of components to fix a more critical one. Our design included
replacement of obsolete controllers, out-of-cornpliance radios, and aged SCADA
software and PC.
The upgrade replaced obsolete equipment and controls with reliable PLC control
panels and high speed Ethernet radio communications. All functions and components
of the system were upgraded, including SCADA software and hardware, radio
communications network, control panels, alarming and remote access. The design
carefully considered sequencing of the work and operational concerns to provide
a smooth transition from old systems to new systems.
The new system is reliable, with improved radio communication, standard
controllers and an open easily expanded Ethernet network. Each station’s panel
is similar in layout and functionality with similar graphics at local panel interfaces
and the SCADA computer screens.
Remote access to entire network via a secured virtual private network allows
operators to monitor systems during off hours through their PC or laptop,
notepad, and even their smart phone.
Key design components included:
m= Upgrade from obsolete Autocon controllers to PLC Control Panels at 10
sites including four well stations, one meter valve pit, two storage tanks, one
pressure station, a booster station, and the main office.
= Replace radios with narrow-band FCC compliant Ethernet ready radios licensed
in the more reliable municipal SCADA system bandwidth 173 frequency.
m= Keep the old system running (including radio network) until the new system was
installed and tested.
m= Replace SCADA control station PCs and SCADA software. Update to VPN
remote access via broadband cable internet with secure gateway firewall
hardware.
westonandsampson.com
client contact
Donald Levesque
DPW Director
Town of Salisbury
978-462-7611
operations coniact
Bernie Rousseau
Vice President
Pennichuck Water Service Company
603-913-2502
Weston(G)Soarnpson
