HYDROVAR^® TECHNOLOGY

CONTROL AND REGULATION

• The HYDROVAR integrated frequency converter features automatic regulation of the speed of an asynchronous three-phase electric motor, by interpreting either a pressure or a differential pressure or a delivery signal (Fig. 1 and 2).
• The pump delivery is detected indirectly through the speed, enabling the pressure, or the differential pressure, to be regulated according to the rate of consumption, based on the pre-set system characteristic parameter (Fig.3).
• Besides the autonomous regulation possibilities described above, the pump with the HYDROVAR device can also be connected to an external system on which the regulation parameters must be set.
• The HYDROVAR device is equipped with connection terminals for remote start and stop for operating and failure signals and for the transmission of an analogue signal (speed or actual value of the regulation signal) to a central control station.
  It is also equipped with an RS 485 interface connection for communication with a central process control system.
• To prevent access and tampering by unauthorized personnel, the set parameters can be partially or fully protected by password. The activation or deactivation of the pump and the setting of the required parameters are obtained directly through the command keys, with messages appearing on the frequency converter’s LCD display.
  Three differently coloured diode indicator lights signal “ON”, “RUN” and “FAULT” (Fig. 4).
  Seven different languages can be selected for the information appearing on the display.
• In case of coupled systems, the microprocessor contained in each regulation unit automatically controls the pumps’ sequential operation based on system requirements. It also controls their cyclic connection in series and automatic switch in case of malfunction, without requiring any supplementary control devices.
• The frequency converter supplies a sinusoidal evaluation output voltage, modulated by impulse length. It operates with controlled synthesis of the sinusoidal current and dynamic current limitation. The high 8 kHz impulse frequency prevents the development of undesired motor noise. With the harmonic filter any reactions in the low voltage areas are avoided (in compliance with EN 5501). The cooling of the frequency converter is ensured by the pump motor fan or, in the wall-mounted version, the fan located in its base.