Lanco Electric, Inc. has developed a pump control system that is specifically designed for the Water and Wastewater industries. The system is optimized for constant level, constant flow and constant pressure systems by harnessing the power and flexibility of variable frequency drives (VFD's), microprocessor based control and an easy-to-use graphical operator interface.

The system can be configured for simplex, duplex, triplex or quadruplex operation depending on the individual system requirements. Optional components allow complete customization of the controls to meet system needs and make this pump control system the perfect choice for all of you critical pumping needs.

Lanco Electric, Inc. has teamed with industry leaders in control and automation products to offer a wide range of pump control systems to the Water and Wastewater markets. Lanco Electric, Inc. provides design, programming, testing and installation services. Our partners in this venture are Danfoss and Rockwell International. Danfoss is a customer-oriented, worldwide supplier of technical products, services and solutions. Since 1933, Danfoss has supplied innovative components to the water industry worldwide. Danfoss Water and Wastewater, headquartered in Milwaukee, sells and supports various products, including adjustable frequency drives, flowmeters, sensors, valves and other components to improve water systems. Rockwell International is one of the world's premier suppliers of automation control hardware and software through its Rockwell Automation and Allen-Bradley product lines.

The choice of variable frequency drive units available in today's market is limitless and Lanco Electric, Inc. will work with and integrate any industrial drive into our control system. At Lanco Electric, Inc. we are not limited to a maximum horsepower rating of only one manufacturer. We can adapt our controls to work with almost any manufacturers' drives. As stated above, Lanco Electric, Inc. features Danfoss VLT Aqua series drives because the VLT Aqua series:

• Are ideal for controlling multiple parallel-coupled pumps
• Eliminate control valves
• Have harmonic distortion protection built in
• Can connect up to 1,000 feet of motor cable without additional filters
• Provide lower energy consumption
• Provide less pump noise
• Provide comprehensive protection of the drive, motor and process equipment
• Require no motor derating as with conventional PWM drives
• Carry a complete line of approvals including UL, cUL and CE

By utilizing VFD's to control the speed of the water pumps the control system can maintain a system set point (Level, Flow or Pressure) precisely and accurately. An optional feature to the VFD is to specify bypass control. This option couples a conventional across-the-line motor starter with the drive. The control system now has two methods to control the motor. A very flexible variable speed method and a simple single speed method. If a VFD ever faults, the control system automatically switches the control over to the bypass system for the affected drive.

As with VFD's, the offerings for industrial control system hardware are immense. Depending on customer requirements, Lanco Electric, Inc. can accommodate any manufacturers' control equipment into a pump control panel. Lanco Electric, Inc. features the Allen-Bradley SLC series of small controllers. The SLC family of control products has a wide range of memory and I/O options from a world leader in industrial automation - Allen-Bradley.

The SLC family provides:

• Multiple communication protocols, including Ethernet
• Support for up to 4096 inputs and outputs
• User selectable program security
• Built in real time clock
• Battery backed up RAM
  

Although quality hardware is extremely important in any design, Lanco Electric, Inc. has developed the logic and control algorithms that are adaptable between many different control platforms.

The Lanco Electric, Inc. pump control system includes several methods of pump control.

Fixed Mode:
In Fixed Mode the operator selects the order in which the pumps will start. At operator selectable set points each pump will turn on in the Fixed Mode order. The turn off of each pump will be determined by a F-I-L-O (First In Last Out) routine. When in fixed mode, the order is always the same until the operator changes the order.

Alternate Mode:
In Alternate Mode the control system selects the order in which the pumps will start. At operator selectable set points each pump will turn on. Again, The turn off of each pump will be determined by a F-I-L-O (First In Last Out) routine. When all pumps are off an alternation will take place. The first pump will now become the last pump to turn on in the next cycle while the second pump will now become the first pump and so on. If an alternation does not take place within any 24 hour period, the system will force an alternation to occur. This mode of operation spreads the workload to all of the pumps and motors equally.

Each pump control system comes complete with standard alarm and event logging capabilities. All drive, motor and process alarms and critical system values are recorded for use by the operator for maintenance and troubleshooting.

OPERATOR INTERFACE

The operator interface is a graphical display that provides the operator with an easy to use window to the control system. Actual process values, alarms and programmable set points can all be accessed via a standard 10.4" diagonal, monochrome touch screen. Optional features include; a color display, trending, a keypad interface or a larger screen size.

In the unlikely event that the control system would fail, an optional factory installed back up control system would automatically take control and operate all pumps directly. This controller is always operating in conjunction with the primary controller but has set points outside the limits of the operator's programmable range. When the primary set point limits are exceed the backup controller will assume direct control of the pumps, cycling them on and off through fixed set points. The primary controller will assume control as soon as it is returned to

The control system will easily accept any of the three types of
process transducers; Level, Flow or Pressure.

For the most common application, wet well level control,
a hydrostatic submersible transducer is placed into the wet well.
This device sends a signal, proportional to the level, to the control system. This type of transducer is simple; it has no moving parts and needs only two wires to be connected to make it operational.
For greater reliability, an optional second transducer can be added to the system. The control system will use the average value of the two units unless the difference between them exceeds a preset value. If that occurs, an alarm is generated and the higher value is used (Failure mode of transducer = minimum value.)

When flow or pressure transducers are required, they are normally placed in-line with the process and their design is dependant on the installation.

Another option for level control systems is mechanical float protection.
High and low level float switches are installed in the well or tank outside the limits of the primary and backup (If applicable) controllers set points.
Should the switches be activated, the control would utilize these inputs for pump(s) on/off control. Operator intervention would be needed to escape from this mode of operation.

The pump control system is normally supplied in its own non-ventilated enclosure. The environmental rating of the enclosure can be specified for any rating type. By having the control in a separate enclosure it can be integrated with all types of VFD enclosures, either closed coupled or mounted remotely.

Lanco Electric Inc.
300 Canal Street
Leechburg,PA 15656
Tel. 724.845.8146 Fax. 724.845.8147
www.lanco-electric.com