Siemens 4FL/4FK Voltage Regulator

Manufacturer: Siemens

The transformer-type voltage regulator supplies electrical loads with a constant voltage despite mains variations.
The advantage of a voltage regulator with a variable-ratio transformer is proportional changing of the sinewave, i. e. the voltage regulator is characterized in that the rms value, mean value and the peak value are held at constant ratios.
A perfect rms value is required, for example, by loads for which the loading is determined by the thermal limits. Strongly capacitive loads in DC units respond to the mean value. A slightly capacitive load is, however, influenced by the peak value. These factors are, however, only guaranteed for sinusoidal AC voltages and this can only be achieved easily by means of a variable-ratio transformer.
Voltage regulators stabilize the mains voltage U1 regardless of the frequency and power factor to the rated value of output voltage U2N within the set control accuracy (±1 % of U2N). The correcting time from the upper or lower limit to the rated value is between 1.5 s and 2.5 s. The curve shape of the supplied voltage is not changed.
The output voltage U2 is compared in the electronic step controller with a set reference voltage. In the event of a deviation in voltage greater than the set response value, the electronic step
controller compensates the deviation with an accuracy of ±1 % using a servo motor and adjustable moving contact on the variable-ratio transformer.

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Features Model

Are electrically connected to the network
Can be overloaded temporarily (see characteristic curve)
Can be installed in a sheet-steel enclosure to IP21 complete with any additional components
Have a degree of efficiency of between 95 % and 98 %
Are not maintenance-free
For the values for control range and control deviation

Mfr. Part No.	Description
4FL/4FK	Rated power Pn, kVA, 31