Zaklad Uzdatniania Wody w Zagnansku [ZUW] is a water treatment plant - including water intakes - in Zagnansk, Poland. It is owned by Wodociagi Kieleckie and constitutes a part of the system that ensures water supply for the city of Kielce.
In order to improve the efficiency of ZUW and control of the water intakes, the board of directors decided to implement a monitoring-controlling system for the facilities. The task was entrusted to Krakow-based company, Techno-Progress.
Standard products
In accordance with the requirements, the solutions applied were based on standard products. The controlling system was built on the base of VersaMax programmable controllers manufactured by GE Fanuc. For the visualisation of the process control at the intakes and at ZUW, the company selected InTouch 7.1 runtime software developed by Wonderware - version for 100-points, running on two HP Vectra PCs with Windows NT 4.0, and integrated on an Ethernet network. One of the computers was installed in the dispatch room, and the other, acting as a backup unit, in the office of the ZUW manager.
The communication between the controllers installed at the intakes and the computer at the dispatch station takes place via Satelline-2ASxE radio modems produced by Satel. The controller installed in ZUW is cable-connected to the computer located at the dispatch station. In both cases the transmission of data is by Modbus RTU protocol.
Operation
The GE Fanuc VersaMax controllers perform the following tasks:
* Acquisition of measurement data from water intakes located within the ZUW area and in the neighbourhood (analog signals).
* Acquisition of data about the operating conditions of the pumps and submersible pumps installed at the intakes (digital signals).
* Generation of signals related to alarm conditions and failures.
* Performing control operations on throttle valves to maintain proper delivery of the pumps at the intakes and artesian wells.
* Calculating pumps' running times.
* Calculating water output and the delivery of the artesian well pumps by impulses from the water meters.
The visualisation application, developed in the InTouch 7.1 software, is composed of 69 different screens including, for example, main menu, general engineering diagram and detailed diagrams, alarm screens, trend displays and information screens. The alarms coming from the sites are indicated: graphically on zoom-in screens; in writing, in the alarm windows; and through audio signals.
Separating the alarm groups enables the operator to browse among the emergencies and alarms registered. Reports on water production and running time of the pumps at artesian wells and pump units at the intakes, can be generated on daily or monthly basis.
The monitoring-controlling system implemented in ZUW provides the operator with the opportunity to exercise full control over the work of the intakes and ZUW itself.
The operator can not only follow the functioning of the sites, but also adjust such values as delivery at specific intakes and pump units, by setting selected degrees of throttle valve opening. Automatically-generated reports on water output allow to reduce the vehicle use expenditures.
Conclusion
Thanks to the wireless data transfer provided by the SATELLINE radio modems, no daily trips are required to get the readings of the water meters installed at the intakes. Another advantage of the system is a quicker detection of and faster response to failures. An interesting aspect is that the monitoring-controlling system includes a security-related function, important both for the 'producer' of water and for the recipients.
For more information contact Mark Dilchert, Satel SA, 011 887 2898, [email protected]
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