Application; Installation - Real-El STAB-300 Operation Manual

ENG
Automatic Voltage
Regulator

5. APPLICATION

Automatic voltage regulator (AVR) is designed for providing various equipment with high-quality
stable electric power supply in conditions of significant and continuous deviations of mains voltage
and protecting consumer devices against overload, influence of high frequency and impulse
interferences.

6. INSTALLATION

Attention! Before connecting the regulator, make sure that all consumer devices con-
nected to it are off.
• Before installing the AVR, please make sure that total power of all voltage consumers is lower than
AVR power. Taking into account the starting load and power factor of voltage consumers, it is
necessary to apply power margin factor of 1.2–1.5; for such equipment as air conditioners, fridges
and other electric motors it should be 1.5–2.
Attention! When choosing an AVR, it is necessary to know that reduction of input voltage
increases value of input current, which means that maximum power of AVR is reduced too!
Such dependence is shown in the graph below:
output power, %
of nominal
100
75
50
25
0 100 1 10 120 130
Note. Adhere strictly to such dependence. If the condition stated above is not adhered to,
warranty servicing becomes void!
• Consumer devices should be connected to the AVR when it is off.
• Connect the AVR to 220 V household mains and switch it on using switch . Digital indicator 
will display the countdown to the AVR starting.
• If the AVR operates properly, digital indicator  will display the voltage on the AVR output, i.e. the
output voltage. Connected consumer devices must be turned on after that only.
• If the mains voltage exceeds the operating range (140 – 265 V), the AVR disconnects the load
automatically (connected devices) and indicator  will display characters "L" or "H".
Attention! If the AVR is not used for a long time, it is recommended to disconnect the AVR
and all consumer devices from the power supply network.
4
Technical support: www.real-el.com
140 150 160 170 180 187 200 210 220 230 240 250 260 265
STAB-300/500/1000/2000
input
voltage, V