WEG AVR-A-OPT-03 Installation, Operation And Maintenance Manual page 14

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6 IDENTIFICATION STICKER
The example above shows the main characteristics to be observed before installation.
NOTE
1. The identification sticker is located under the regulator.
7 PROTECTIVE FUSE
The fuse is used to limit the power supply input current to protect the alternatorfield. The voltage regulators AVR-A-OPT-
03 are equipped with a controlled rectifier that forces the field voltage to obtain the correct alternatoroutput voltage. When
operating with the maximum field voltage the power input current is
a half of the field current. So, the fuse current must be a little more than the field voltage supported by the voltage regulator.
Some fuse characteristics are listed bellow.
Recommended manufacturer: LittelFuse (ordering code: 235003)
Characteristics: Fast acting fuse.
Dimensions: 5x20 mm.
Current/Voltage: 3A/250V.
8 TRIMPOTS FUNCTION
Vad: Voltage adjustment
Stb: Stability Adjustment
U/F: Under frequency adjustment U/F
Drp: Droop adjustment (only for AVR-A-OPT-03/C)
14
l Analog Voltage Regulator AVR-A-OPT-03
Fuse opening time
% of maximum current
110
135
200
1- Model
2- Power input
3- Rated current
4- Excitation voltage
5- Operation frequency
Opening time
4 hours (minimum)
Max. 1 hour
Max 1 second