Область применения

The U 307 digital motorized potentiometer is used as a setpoint generator for closed-loop control equipment. It can serve for the following applications:

Remote changing of setpoints with separately adjustable ramp-up and ramp-down times

Ramp-function generator (slope limiter) for analog voltages 0 to -10 V or 0 to +10 V

Diameter tracking and storage for winder functions (e.g. in conjunction with SIMOREG supplementary boards such as Z 702)

The U 307 operates completely wear-free because a microprocessor is used.

Reliable storage of the output variable is ensured, even when the supply voltage is switched off for any length of time.

The U 307 has its own 230 V power supply.

Заказные данные

Дизайн

The U 307 can be snapped onto a standard mounting rail to DIN 46 277. The unit can also be mounted directly on a vertical surface (e.g. in a cubicle) by means of two screw fixtures to DIN 46 121 and DIN 43 660.

A clearance of approx. 15 mm on all sides must be maintained without fail, on account of the temperature rise in the unit.

For more detailed information, please refer to the Operating Instructions, Order No. E31930-T7001-X-A3-7400.

Способ действия

Ramp-up and ramp-down times are reproducibly adjustable with quartz accuracy using a thumbwheel switch over the range 1 to 999 s (corresponding to 16:40 min.).

MANUAL mode(MAN switch setting)

The output voltage is changed via the UP and DOWN control inputs according to the set ramp-up or ramp-down time t-UP and t-DOWN.

AUTOMATIC mode(AUTO switch setting)

The output voltage follows an analog reference setpoint along a ramp according to the preset ramp-up/ramp- down time. The reference setpoint can be preset as a voltage signal (0 to -10 V or 0 to +10 V) or as a current signal (0 to 20 mA). Additionally, a potentiometer can serve as the setpoint generator. The U 307 provides a highly accurate +10 V reference voltage for the purpose.

Control inputs

All control inputs are SIMATIC compatible and isolated via optocouplers.

Reset facilities

The output value can be reset to 0 V at any time via the RESET control input.

The nonvolatile storage can be canceled by inserting an optional terminal jumper between terminals 27 and 28. When the 230 V supply voltage is switched on, 0 V then appears at the output and not the value in the nonvolatile memory.

External ramp-up time changeover

The external ramp-up time changeover can be activated by inserting a jumper between terminals 29 and 30. In this case, the ramp-up or ramp-down time can be changed during operation with external switch t-DN/t-UP. At the t-DN setting, the time selected at the t-DOWN thumbwheel is valid, and at the t-UP setting the time selected at the t-UP thumbwheel is valid. Whether the motorized potentiometer is ramping-up or ramping-down is insignificant.

For example, the “fast/slow acceleration” function can be implemented in this way.

Технические данные

* NOVRAM = Random Access Memory
= non-volatile

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