Analog Input - WEG WRGA-02 Manual De Instalación, Operación Y Mantenimiento

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This operation mode is selected by adjusting the U/F trimpot, by it specific jumper and associated components. The JHz jumper
determines the operation frequency, which follows the scheme shoen below:
JHz position 1-2 = 50Hz
JHz position 2-3 = 60Hz
The U/F trimpot determines the actuation point for U/F, which can be from the rated frequency (Fn) up to 1/3 of Fn, whose value
comes adjusted from the factory at 10% below of Fn. For operation in 60Hz it is adjusted atr 54Hz and for operation in 50Hz it
isadjusted at 45Hz (see figure 13.1.2), this value can be changed according to the needs of each application.
ATTENTION
1. Do not leave the U/F protection open. The configuration must be done according to figure 13.1.2 to
avoid problems when shutting down.
2. WRGA-02 - The frequency limited by U/F is the wave form frequency that is found at the power
supply input of the circuit and not for sensing voltage input (generator output voltage).
3. WRGA-02/D - The frequency limited by U/F is the wave form frequency that is at the regulator
sensing voltage. The supply frequency can be different from sensing frequency and can vary
according to the range specified in the characteristics table.

13.2 ANALOG INPUT

The analog input circuit provides a variation in the output voltage reference of the generator of 15% with a variation of -10Vcc to
10Vcc. It is isolated by opto-couplers with a maximum consumption of 10mA.
18 l Automatic Voltage Regulator – GRT7-TH4-R2
Figure 13.1 - Actuation point for U/F.
Figure 13.2 - Actuation point for U/F