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Teknika autosynchronizer relay is used for paralleling of gensets by matching voltage, frequency, phase angle and zero crossover, internal settings for speed of closure (fst, medium, slow) and breaker close timings. Relay gives a breaker close signal and locks itself out preventing further commands. Raise / lower signals for frequency and voltage can be used to increase / decrease genset speed and AVR output voltage. Upto four generators can be synchronized by building control logic to synchronize generators one by one.