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Eight town Bid. (part 2)  

Borehole pumps - The borehole pumps are controls manually from the local panel or automatically from the high lift pumping station and treatment plant.

A "manual - off - automatic" selector switch will be located on the local panel and provides to select the control mode.

In "manual" mode the pump is controls by local panel buttons "start" and "stop".

In "automatic" mode the pump is controls from the high lift pumping station and treatment plant control system so that the level in reservoir in maintained at preset level.

The pumps operate as "duty", "first assist", "second assist", "third assist", "fourth assist", "fifth assist" and "standby". The "standby" pump taking over the duty of any pump that fails or become unavailable for duty.

The borehole pumps control algorithm rotates the duty for pump run time evening.

The pump is protected from running in "manual" and "automatic" control modes if borehole water level falls below the borehole water level set point. The borehole level sensor provides an analogue output signal (4...20mA) which is proportional to the borehole level. The measure value of borehole level is using by local automatic and transmitting via telemetry to the control center.

High lift pumps - The high lift pumping station provides digital inputs and outputs to the PLC to turn the pumps on and to provide feedback to indicate when the pump contractors have pulled-in and the variable speed drives have reached the requested speed. A three-phase monitor also provides an alert to operators at the filtration plant if at least one phase of the incoming electrical service is lost.

The high lift pumps are controls manually from the panel or automatically from control center.

A "local - panel - off - automatic" selector switch will be located on the control panel.

In "Local" mode the pump is controls by "stop" and "start" buttons placed at pump.

In "Panel" mode the pump is controls from panel by "stop" and "start" buttons (for each pump).

In "Automatic" mode the pumps are control from control center so that the pressure in the discharge main keeps within preset bounds.

The emergency stop button is a latching button, it is places at each pump and works in all operate modes. The pump is not starts while emergency stop is pressed. The pumps operate as "duty", "first assist", "second assist" and "standby".

The "standby" pump taking over the duty of any pump that fails or become unavailable for duty.

The high lift pumps control algorithm rotates the duty for pump run time evening.

The pump is protected from running in "manual" and "automatic" control modes if the suction pressure is below the set point. A time delay included in the protection circuit to avoid tripping in start up.

Treatment plant - The treatment works operate as fully automatic system. Plant status and process is monitoring.

Filter backwashing is initiated by the filter head loss/timer/manual. All valves and pumps that are required for backwashing will be automatic.

Control can be fine-tuned and operators can make better decisions because of a substantial increase in information available on the HMI, which can display any of 3,000 tags. There are also many more alarms, enabling operators to detect and correct problems earlier.

No control is located in a PC. All alarming and horn activation is performed in the controllers for the highest reliability. Variable frequency drives on low service pumps, high service pumps, and transfer pumps have boosted plant energy efficiency.

Chlorization plant - The treatment works operate as fully automatic system. Plant status and process is monitoring.

Pump management station for the artesian well pumps- The pump management station is designed for stand alone artesian wells. It provides control, regulation and protection of artesian well pump. The pump management stations are the main part of water supply SCADA system.


Pump management station consists of:
Specialized controller for submersible pump.
Control cabinet with contactors and manual controls.
Communication device.

Typical specialised controller features are
Pump status control
Pump protection (overcurrent, overvoltage, surge protection, phase unbalance)
Working time count
Power consumtion measurement
Phase angle measurement and dry drive protection
Phase volltage measurements
Phase unbalance measurement
Phase current measurements
Ground leaking current measurement
Overheating protection
Pressure measurement
Flow measurement
Temperature measurement
Defrosting heater control (for cold climate)
Setpoint memory
Events memory
Guard sensors control
LCD display
Comunication with high level of management (SCADA)

Control cabinet with relays and manual controls.

Control cabinet is provided power supply for pump.
Control cabinet is provided power supply for heater.
Relays are control from specialized controller (Auto mode)
Relays are control from sensors (Local mode)
Relays are control from control switches (Manual mode)
Variable frequency drive may be installed in control cabinet and supported by specialised controller software.

Communication device is intended to provide connection between SCADA level and pump management station. It is located in control cabinet. Communication device is radio or power line modem with 4,8-Kbit rate.

Pump management station for the high lift plants - Frequency converter allows pumps to work in optimal modes. Boosting pumps manager (BPM) fulfils selection of current optimal mode. BPM may work by water supply SCADA system control via radiolink.Boosting pump management station is designed for pressure boosting plants. It provides control, regulation and protection to high lift pumps.

Pump management station consists of:
1. Specialised controller for high lift pumps.
2. Frequency driver
3. Control cabinet with contactors and manual controls.
4. Communication device.
5. Primary sensors

Typical specialised controller features are

Variable frequency drivers control (all brand name protocols supported) Pump status control
Pump protection (overcurrent, overvoltage, surge protection, phase unbalance)
Working time count
Dry drive protection
Phase voltage measurements
Phase unbalance measurement
Phase current measurements
Overheating protection
Pressure measurement
Flow measurement
Temperature measurement
Setpoints memory
Events memory
Guard sensor control
LCD display
Pump rotation
Day pressure Setpoints
Night pressure Setpoints
Input pressure measurement
Output pressure measurement
Real time event log (200 events)
Communication with high level of management (SCADA)

Control cabinet with contactors and manual controls.

Control cabinet is provided power supply for pump.
Contactors control from specialized controller (Auto mode)
Contactors control from sensors (Local mode)
Contactors control from control switches (Manual mode)

Variable frequency drive is installed in control cabinet and supported by specialized controller software.

The typical operator runs the controllers by following easy-to-use directions for most daily operations. The system does not require special training or an electronics engineer for set-up or operation. A large LED digital readout displays all quantities.

The system operates on any AC supply voltage from 85 volts to 265 volts. Its battery and solid state memory system provides a redundant memory back up.



Communication device.

Communication device is intended to provide connection between SCADA level and pump management station. It is located in control cabinet. Communication device is radio or power line modem with 4,8-kbaud rate.

Primary sensors-level transmitter and pressure transmitter.

Pressure transmitter is pipe-mounted sensor suitable for potable water with 4-20 ma output. Level transmitter is pressure sensor suitable for potable water located inside water tank with 4-20 ma output suitable for potable water.

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