Trimpots Function; Field Flashing - WEG EA05A-WG Manual De Instalación Y Operación

4. TRIMPOTS FUNCTION

Trimpot Function
VOLT Voltage adjustment
STAB
Stability adjustment
U/F Under frequency adjustment
DIP Switch: settings for "sensing voltage" and "frequency" (see Fig.1).
ATTENTION
1. Before connecting the regulator to the generator, check the installation manual and the nominal
reference voltage. Incorrect connection can damage the AVR or other equipment.
2.
Incorrect voltage and frequency adjustment can damage AVR.
5. AVR ADJUSTMENT

Check the setting of voltage / frequency before starting the generator.

Before starting the generator, turn VOLT and STAB trimpots fully counterclockwise.

When the generator starts up and running at a constant speed, turn VOLT trimpot clockwise to reach the required
output voltage. (If an external adjustment potentiometer is used, it needs to be adjusted to the middle position
before adjusting VOLT trimpot).

Turn the STAB trimpot clockwise slowly to set the response time (dynamic response) between the AVR and the
generator.
If setting too high, the voltage will oscillates.
If setting too low, the voltage will change too much when experiencing heavy loads.

An analog voltmeter recommended for "Stability Adjustment". Adjust until the pointer is stationary. This will enhance
the voltage drift during heavy load.
 It's not necessary to adjust the UFRO function. The under frequency protection (U/F) is factory set. EA05A-WG's
roll-off point for 60 Hz mode is preset at 55 Hz, and for 50 Hz mode is preset at 45 Hz.
UFRO DIP:
Close - please refer to solid curve in Figure 2.
Open - please refer to dotted curve in Figure 2.

6. FIELD FLASHING

Generation begins through the residual voltage of the generator. Once the voltage has reached above 5 Vac, the
regulator controls the generator voltage causing it to rise through the initial ramp in approximately 3 seconds. When the
generator reaches its nominal value, it will maintain constant generator output voltage according to the set value.
If the residual voltage on the wires F + and F- power output of the regulator is below 5 Vac, in this case it is recommended
to stop the generator and performing the following steps (see Fig.10):
a. Disconnect the regulator field terminal and apply no more 3-12 Vdc resistor in series with a 3-5 ohms connected in
such a way that the positive battery cable is going to F + and the negative cable which goes to F-.
b. Wait for about 3 seconds and remove the voltage source.
c. With the voltage regulator disconnected, start the generator and measure the residual voltage of the generator in the
auxiliary winding, which must be greater than 5 Vac. If this is so, reconnect the regulator and alternator priming should
be provided normally. If voltage is less than 5 Vac, repeat the step a and b).
d. If residual voltage is greater than 5 Vac but still unable to build up voltage, replace the voltage regulator.
ATTENTION
1. Overly field flashing may damage the AVR or the field winding.
Turning it clockwise to increase voltage and counterclockwise decreases
Turning it clockwise , dynamic response will be slower
Turning it clockwise to increase U/F and counterclockwise decreases.
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Adjustment
Automatic Voltage Regulator | 3