Контроль косинуса фи (контроль нагрузки двигателя)

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• Информационные материалы

  Информационные материалы

  Устройство контроля коэффициента мощности 3UG30 14 позволяют контролировать нагрузку двигателей.

  Область применения

  • Контроль холостого хода двигателя
  • Контроль снижения нагрузки в низком диапазоне оценки
  • Простой контроль коэффициента мощности в сетях, оборудованных установками  компенсации реактивной мощности
  • Обнаружение повреждение кабеля между шкафом управления и двигателем

   

  Особенности

  • Применение во всем мире благодаря широкому диапазону напряжений: от 90 ... 690 В
  • Контроль параметров однофазных двигателей малой мощности на холостом ходу с токами до 0.5 A
  • простое определение величины порога срабатывания через прямое измерение совокупности переменных на нагруженном двигателе
  • Контроль окна (заданного диапазона) и измерение активной составляющей тока позволяют определить обрывы кабельной линии между шкафом управления и двигателем, так же как и обрыв линейного провода
  • Опциональный принцип измерения; коэффициент мощности или I_res (активный ток)

  Технические данные

  3UG4641 monitoring relays

  The 3UG4641 monitoring relay is self-powered and serves the single-phase monitoring of the power factor or performs overshoot, undershoot or range monitoring of the active current depending on how it is parameterized. The load to be monitored is connected upstream of the IN terminal. The load current flows over the terminals IN and Ly/N. The setting range for the power factor is 0.1 to 0.99 and for the active current I_res it is 0.2 to 10 A. If the control supply voltage is switched on and no load current flows, the display will show I < 0.2 and a symbol for overrange, underrange or range monitoring. If the motor is now switched on and the current exceeds 0.2 A, the set ON-delay time begins. During this time, if the set limit values are undershot or exceeded, this does not lead to a relay reaction of the changeover contact. If the operational flowing active current and/or the power factor value falls below or exceeds the respective set threshold value, the spike delay begins. When this time has expired, the relay changes its switch position. The relevant measured variables for overshooting and undershooting in the display flash. If monitoring for active current undershoot is switched off (I_res▼= OFF), and if the load current undershoots the lower measuring range threshold (0.2 A), the change-over contacts remain unchanged. If a threshold value is set for the monitoring of active current undershooting, then undershooting of the measuring range threshold (0.2 A) will result in a response of the CO contacts.

  The relay operates either according to the open-circuit or closed-circuit principle. If the device is set to Auto RESET (Memory = No), depending on the set principle of operation, the switching relay returns to its initial state and the flashing ends when the hysteresis threshold is reached.

  If Manual RESET is selected in the menu (Memory = Yes), the switching relay remains in its current switching state and the current measured value and the symbol for undershooting and overshooting continues to flash, even when the measured variable reaches a permissible value again. This stored fault status can be reset by pressing the UP▲ and DOWN▼ keys simultaneously for > 2 seconds, or by switching the supply voltage off and back on again.

  With the closed-circuit principle selected

  Response in the event of undershooting the measuring range limit

  • With activated monitoring of I_res▼

  

  • With deactivated monitoring of active current undershooting

  

  Overshooting of active current

  

  Undershooting of active current

  

  Range monitoring of active current

  

  Overshooting of power factor

  

  Undershooting of power factor

  

  Window monitoring of power factor

  

  Дальнейшая информация

  Если активный ток превышает 10А, можно использовать трансформаторы тока 4NC Ires > 10 A. См. Building Control → Low-Voltage Power Distribution and Electrical Installation Technology → SENTRON Protecting, Switching, Measuring and Monitoring Devices