I just read the destructions [Rule #1 - only to be read once you have wrecked the unit!] on my 6kw 3Ø 415v 2 pole Italian built alternator. The mnfr. recommends setting the Voltage Control 3 or 4% over-voltage to allow for sag when drawing power using a gas-engine drive. The adjuster appears to be a simple setscrew in the pic. [I never touched it from new, the only mod was to ground the centre-tap on delta as recommended on ECN for anti volts-drift.] I use a pair of single-phase duplex-drive 2 pole induction motors [ = 50 hz supply in theory] , pulley-veebelts @ 1:1 to the alternator: this must give me about 4% sag on hz as the motors slip at full chat, but the machinery I run just goes a bit slower, with no probs after 6 years of daily use.
