Pump Control Unit PGS

July 2011

For the evaluation of level, pressure and flow quantities - with trend recognition and auxiliary energy source

Description

The PGS pump control unit is used together with a transducer supplying a standard power signal of 0 or 4 to 20 mA (e.g. immersion transmitter ETG) as a convenient, intelligent and decentralized control system in all drinking water and waste water technology applications that require an exact determination of the level, pressure or the flow quantity, the exact setting of the limited values, simple operation and a high degree of operational safety.

Application

    The PGS pump control unit assigns a level with the unit “m water column” to the standard power signal 0/4 … 20 mA supplied by the transducer (in the case of pressure the unit “bar” and in the case of flow quantity the unit “l/s”).

    "...the PGS device can be adjusted easily ..."

    Mr. Carsten Kühn, city Solms

    Scaling e.g. for the level, is either via the maximum value from the transducer (ETG) at 20 mA or via the actual value (momentary value). The scaling is defined in steps of tenths or hundredths. The indicator value is calculated according to the input power and the scaling that is set. It is also possible to provide a scaled percentage indicator. The value of the analogue output changes in accordance with this scaling whereby 100% corresponds to 20 mA or 5/10 V at the output.

    All the limited values can be determined with the measuring range. For all three limited value pairs the turn-on value can be above or below the turn-off value (fill or empty tanks). Cyclical alternating of two or three limit value contacts balances the load of the connected pumps to ensure uniform wear.

    A high degree of operational safety is ensured by the measuring system being continuously supervised. Errors, cable parting or short-circuits, corresponding to the lower deviation from the programmed zero point or the permissible input power being exceeded, are indicated in clear text and also as a potential-free fault. The parameter setting for all functions does not require additional programming equipment and is carried out with 3 keys. For the sake of easy operation it is fully menu guided.

    A separate constant voltage supply provides the transducer with the auxiliary power required.