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SCADA

Introduction

Supervisory Control And Data Acquisition (SCADA) systems are becoming more common in wastewater treatment plants because of a variety of functions they can perform.  SCADA systems can consist of a variety of equipment, such as autodialers, system monitors, gauges and alarms.  These units are then connected to a central control unit such as a computer, allowing plant operators to control the equipment directly from the central control unit.  The SCADA equipment can perform functions such as flow monitoring, alarm notification, data logging, and flexible system communication.  Remote areas such as WWMA'a CSO overflow regulators and Ardara Pump Station could be monitored and checked at any time right from the Plant.  SCADA systems can be configured to send faxes or place telephone calls in situations such as plant malfunctions or abnormal conditions.  A system adapter can even be added to allow plant workers to use the telephone to control equipment.  As the plant continues to upgrade and expand, computerized systems using SCADA will be invaluable at maintaining system controls and allowing plant operators the flexibility of system operation from a computer or, if necessary, a telephone.

Existing System Requirements

  Although WWMA currently has some computerized system controls for items such as the wetwell pumps and various other pumps and valves, the system's use is limited and not centralized.  The Panalarm panel in the control building operates in a run/off mode and is only capable of monitoring whether or not equipment is operating properly.  Control of the equipment cannot be performed from the Panalarm and must be performed at the location of the equipment or at one of the motor control centers or local control stations.  A centralized control system such as SCADA would link plant-wide operations and allow the control and operation of various processes from one location, eliminating the need for the Panalarm.

Reasons for Exploring Alternatives

Plant costs and ease of control and maintenance are the main reasons for exploring the implementation of a SCADA system.  While the Panalarm displays the status of different pieces of equipment, an alarm system that could be provided by a SCADA setup would alert plant workers of a problem immediately, thus allowing quicker response time and avoiding possible equipment damage and breakdown.

Another reason to consider SCADA is ease of data acquisition.  WWMA operates three overflow regulators in remote locations from the plant, as well as a remote pump station.  A SCADA system would allow a dial-in procedure by which plant workers can easily check the status of remote equipment from the plant at any time.  This would reduce the need for off-site trips and allow for a more frequent monitoring process.

An added benefit of the SCADA system is centralization of control.  As was previously discussed, the Panalarm monitors the operation of various pieces of equipment but does not operate the equipment from the Panalarm itself.  Any changes to equipment operation have to be performed by plant workers.  A SCADA system could computerize as many pieces of equipment as WWMA wants and process the data for collection at one central location, such as the manager's office.  This would eliminate the need for manual equipment control at the equipment location or control centers/stations.

The majority of new equipment has built-in provisions for automated control or remote monitoring.  The Authority recently purchased new plant operating software to monitor operation and maintenance functions.  

Recommendations and Summary of Equipment

HDR Engineering, Inc. recommends that the Authority consider the installation of a SCADA system to improve plant operation and maintenance capabilities.  While this is not a priority item, implementation should be considered within the next five years.  The following list summarizes the list of items necessary for a relatively simple SCADA system for the Plant:

  • Remote Terminal Units (RTU's)
  • Hard-Wired Power Supply
  • Battery and Mounting Kit
  • Software Package to Run System
  • Modem Module for RTU's
  • Personal Computer
  • Electrical Considerations

The complexity of a SCADA system is dependent on how detailed the system would be and costs needed to centrally computerize many of its operations.  Basic systems with minimum controls are fairly inexpensive, while larger systems, by default, costs more but have greater capabilities.  A simple system may consist of providing data acquisition for areas such as the CSO overflow control points as well as monitoring points for different pumps, valves, and other equipment.  Costs rise as additional control points are added; however, WWMA's applications will probably require a relatively small number of control points.

 

 

 

 

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Last modified: May 3, 2018