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HPK-1000/1500/2000/2500/3000 USER MANUAL 18
of protection time. Inverter relay breaks off and reconnect to grid automatically
according to CEI 0-21 requirement, Then the next test starts. Test order is
81>.S1(maximum over frequency), 81>.S2(maximum over frequency),
81<.S1(minimum under frequency), 81<.S2(minimum under frequency),
59.S1(maximum voltage over 10min), 59.S2(maximum over voltage), 27.S1(minimum
under voltage), 27.S2(minimum under voltage).