Область применения

The U 309 adaptor module allows the U 307 digital motorized potentiometer to be operated also in the automatic mode with a reference setpoint of 4 to 20 mA (impressed current with live zero).

Circuit description

The circuit diagram is shown in the figure. A voltage of exactly 2.50 V is obtained via a voltage divider (R4-R7) from the +10.00 V reference voltage available at terminal 17 of the motorized potentiometer. This voltage is applied to input IN- of the motorized potentiometer (terminal 20) and compensates the 4 mA live zero current.

A load resistance of exactly 634 W (R1 + R2 + R3) is inserted between terminals 21 and 23 of the motorized potentiometer; the 4 to 20 mA signal source is also connected at that point. The total signal excursion of 16 mA results in a voltage drop of exactly +10.00 V at motorized potentiometer input IN+. The input impedance of IN+ of 44 kW was taken into account for the design rating of the resistors.

Заказные данные

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Дизайн

The U 309 adaptor module can be snapped onto a standard mounting rail to DIN 46 277 (35 mm DIN rail). It is not intended for screw fixing.

Технические данные

For more detailed information, please refer to the Operating Instructions Order No.. E319/An/U 309 BA.

До­пол­ни­тель­ную ин­фор­ма­цию вы мо­жете полу­чить за­гру­зив файл в фор­мате PDF (84248 байт).

Схема подключения