AQUAVAR^® is the world’s first pump mounted, microprocessor based pumping system controller. The AQUAVAR^® does much more than just change motor speed. It truly manages your pump performance to match a wide range of system conditions and requirements.

The typical construction of a pressure set or constant pressure system includes one or more pumps assembled together with common suction and discharge headers which are then connected to a large pressure accumulator, this package set is then connected to the system. As the system demand increases the pumps are switched on by some form of pressure sensor that operates through a control panel. On systems which require alternating duty sequencing bypass lines are maintained by the use of metering valves. The use of some of these variable speed drives also requires the use of special motor/controller combinations.

Control:

The built-in frequency inverter and microprocessor provides pump control based on pressure, differential pressure, or flow. The AQUAVAR^® pressure control version stops the pump at zero consumption. The discharge of the pump is being calculated via the speed indirectly and may be programmed to compensate for varying friction losses following a programmable system curve.

The AQUAVAR^® variable speed pump may additionally be controlled externally with the required speed fed in by an external control system.

To prevent unauthorized personnel from changing operating data, a password may be set up. The starting and stopping of the pump as well as the setting of control parameters is done at the keyboard and shown at the LCD display at the drivehead. The display is two lined and programmed for seven languages. There are also three diodes to indicate pump ready, pump running and fault.

An analogue signal to monitor speed or pressure is provided. Communication with a central control system is also possible via an RS 485 interface. Each AQUAVAR^® drivehead contains an individual microprocessor which controls the automatic operation of lead and lag pumps according to demand. Cyclic change over of lead and lag pumps, automatic start gets out of order. No external controls are necessary .

The voltage controlled frequency inverter supplies a sinus variated pulse with modulated output voltage. It works with controlled sinusoidal current synthesis and a dynamic overcurrent limitation. The high swichting frequency of 8 kHz prevents undesired noise from diving motors. Reactions to the feeder are prevented by a filter. Inverter cooling is enhanced by the motor fan.

There is also a memory for inverter "fault" signals, operating hour counter and an automatic cyclic start up of the pump as a test run.

For additional information or details contact Alaska Pump & Supply Inc.