5-228 M60 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUALGROUPED ELEMENTS CHAPTER 5: SETTINGS5Figure 5-125: Negative-sequence overvoltage logic5.7.10.6 Auxiliary undervoltage (ANSI 27X, IEC PTUV)SETTINGS GROUPED ELEMENTS SETTING GROUP 1(6) VOLTAGE ELEMENTS AUXILIARY UV1(2)The M60 contains one auxiliary undervoltage element for each VT bank. This element monitors undervoltage conditions ofthe auxiliary voltage.The AUX UV1 PICKUP selects the voltage level at which the time undervoltage element starts timing. The nominal secondaryvoltage of the auxiliary voltage channel entered under SETTINGS SYSTEM SETUP AC INPUTS VOLTAGE BANK X5 AUXILIARY VT X5 SECONDARY is the per-unit base used when setting the pickup level.The AUX UV1 DELAY setting selects the minimum operating time of the auxiliary undervoltage element.Both AUX UV1 PICKUP and AUX UV1 DELAY settings establish the operating curve of the undervoltage element. The auxiliaryundervoltage element can be programmed to use either definite time delay or inverse time delay characteristics. Theoperating characteristics and equations for both definite and inverse time delay are as for the phase undervoltageelement.The element resets instantaneously. The minimum voltage setting selects the operating voltage below which the elementis blocked. AUXILIARY UV1 AUX UV1FUNCTION: DisabledRange: Disabled, Enabled AUX UV1 SIGNALSOURCE: SRC 1Range: SRC 1, SRC 2, SRC 3, SRC 4 AUX UV1 PICKUP:0.700 puRange: 0.000 to 3.000 pu in steps of 0.001 AUX UV1 CURVE:Definite TimeRange: Definite Time, Inverse Time AUX UV1 DELAY:1.00 sRange: 0.00 to 600.00 s in steps of 0.01 AUX UV1 MINIMUM:VOLTAGE: 0.100 puRange: 0.000 to 3.000 pu in steps of 0.001 AUX UV1 BLOCK:OffRange: FlexLogic operand AUX UV1 TARGET:Self-resetRange: Self-reset, Latched, Disabled AUX UV1 EVENTS:DisabledRange: Disabled, EnabledSETTINGSETTINGSFLEXLOGIC OPERANDSSETTINGSETTINGNEG SEQ OV1FUNCTION:NEG SEQ OV1 RESETDELAY:NEG SEQ OV1 PICKUPDELAY:NEG SEQ OV1 PKPNEG SEQ OV1 DPONEG SEQ OV1 OPNEG SEQ OV1 BLOCK:Off = 0Enabled = 1NEG SEQ OV1 SIGNALSOURCE:NEG SEQ VOLTAGE V_2827839A4.CDRANDSETTINGNEG SEQ OV1 PICKUP:RUNttPKPRSTV_2 > PICKUP
