CHAPTER 5: SETTINGS CONTROL ELEMENTSG30 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL 5-2555Figure 5-140: Selector switch logic5.8.5 Underfrequency (ANSI 81U)SETTINGS CONTROL ELEMENTS UNDERFREQUENCY UNDERFREQUENCY 1(6)There are six identical underfrequency elements, numbered 1 through 6. UNDERFREQUENCY 1 UNDFREQ 1 FUNCTION:DisabledRange: Disabled, Enabled UNDERFREQ 1 BLOCK:OffRange: FlexLogic operand UNDERFREQ 1 SOURCE:SRC 1Range: SRC 1, SRC 2, SRC 3, SRC 4 UNDERFREQ 1 MINVOLT/AMP: 0.10 puRange: 0.10 to 1.25 pu in steps of 0.01 UNDERFREQ 1 PICKUP:59.50 HzRange: 20.00 to 65.00 Hz in steps of 0.01 UNDERFREQ 1 PICKUPDELAY: 2.000 sRange: 0.000 to 65.535 s in steps of 0.001 UNDERFREQ 1 RESETDELAY : 2.000 sRange: 0.000 to 65.535 s in steps of 0.001 UNDERFREQ 1 TARGET:Self-resetRange: Self-reset, Latched, Disabled UNDERFREQ 1 EVENTS:DisabledRange: Disabled, Enabled
