WEG GRT7-TH4 Manual De Instalación, Operación Y Mantenimiento página 19

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3º. Turn on circuit breaker:
4º. Turn slightly the trimpot Vad clockwise (the lamp must shine after certain position of trimpot)
5º. With lamp on, turn slightly the trimpot Vad counter-clockwise (after certain position of trimpot, the lamp must turn off);
6º. Turn off the circuit breaker.
Automatic Voltage Regulator - GRT7-TH4 | 19