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M-3401 RELAY LOAD SHEDDING COM 1 TARGET/OUTPUT RESET 27 59 8 1R 81 # 1 OUTPUT 1 OUTPUT 2 OUTPUT 3 81 # 3 81 # 4 47 OUTPUT 5 81 # 2 OUTPUT 4 EL ECT RIC BECKW ITH Ma de i n U. S.A . CO. I NC. TM COM 1 TARGET/OUTPUT RESET TM LOAD SHEDDING RELAY M-3401 81 #3 81 #4 47 81 #1 81 #2 81R 59 27 OUTPUT 5 OUTPUT 1 OUTPUT 2 OUTPUT 3 OUTPUT 4 BECK WITH ELECT RI C Ma d e i n U. S. A . CO. INC. TARGET/OUTPUT RESET TM COM 1 47 M-3401 LOAD SHEDDING RELAY Ma de in U. S.A . BECKWITH
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  M-3401 RELAYLOAD SHEDDING COM 1TARGET/OUTPUTRESET 275981R81 # 1OUTPUT 1OUTPUT 2OUTPUT 381 # 381 #447OUTPUT 581 #2 OUTPUT 4 EL ECTRICBECKW ITHMade in U.S.A .CO. INC. TM COM 1TARGET/OUTPUTRESET TM LOAD SHEDDINGRELAY M-3401 81 #381 #44781 #181 #281R5927OUTPUT 5OUTPUT 1OUTPUT 2OUTPUT 3OUTPUT 4 BECK WITHELECT RICMad e i n U.S.A .CO. INC. TARGET/OUTPUTRESET TM COM 147 M-3401 LOAD SHEDDINGRELAY Made in U.S.A.BECKWITHELECT RICCO. INC. 81 #381 #481 #281 #181R5927OUTPUT 3OUTPUT 4OUTPUT 5OUTPUT 1OUTPUT 2DIAGNOSTICRELAY OK DIAGNOSTICRELAY OKRELAY OKDIAGNOSTICIPSlogic TM IPSlogic TM IPSlogic TM Load Shedding RelayM-3401 PROTECTION Voltage Collapse Mitigation providing 4-step undervoltageand 4-step underfrequency load shedding functionsãUndervoltage blocking and negative sequence overvoltageblocking for system faults provides load shedding securityãLocal and remote serial communications (MODBUS Protocol)for monitoring and control functionsã5 programmable outputs and 2 programmable inputs Integrated Protection System ® M-3401 Standard Panel M-3401 Vertical Panel (Optional) M-3401 Horizontal Panel (Optional)  Industry Leader Since 1969Made in the USA  –2–M-3401 Load Shedding Relay Protective Functions 4-Step Phase undervoltage (27) protection, single-phase and positive sequenceã4-Step Phase undervoltage, selectable as single phase or positive sequence responding, withNegative sequence overvoltage and three phase undervoltage supervisionãPhase overvoltage (59) protectionãFour-step over/under frequency (81) protectionãRate of Change of Frequency (81R) protectionãIPSlogic TM  takes the contact INPUT status and function status and generates OUTPUTSby employing (OR, AND, and NOT) boolean Logic and a timer. Standard Features ã5 programmable outputs, 2 programmable inputs, and 1 self-test outputãOscillographic recording (COMTRADE file format)ãTime-stamped sequence of events (SOE) recording for 32 eventsãMetering of Voltage and FrequencyãOne RS-232 port (COM1) on front and one RS-232 or 485 port (COM2) on rearãM-3812 IPScom  ®   For Windows TM  Communications SoftwareãMODBUS protocolãSupports both 50 and 60 Hz applicationsãRelay voltage inputs can be directly connected (no VT required) for voltages < 480 V acãContinuous Self-Diagnostics Optional Features ãM-3801D IPSplot  ®    PLUS   Oscillograph Analysis SoftwareãHorizontal and Vertical panel mount versions available (see Figures 2 and 4)  –3–M-3401 Load Shedding Relay PROTECTIVE FUNCTIONSPROTECTIVE FUNCTIONSPROTECTIVE FUNCTIONSPROTECTIVE FUNCTIONSPROTECTIVE FUNCTIONS DeviceDeviceDeviceDeviceDevice SetpointSetpointSetpointSetpointSetpointNumberNumberNumberNumberNumber FunctionFunctionFunctionFunctionFunction RangesRangesRangesRangesRanges IncrementIncrementIncrementIncrementIncrement AccuracyAccuracyAccuracyAccuracyAccuracy Phase Undervoltage Pickup #1, #2, #3, #44 to 100%*0.1%  0.5 V   or   0.5%Time Delay #1, #2, #3, #41 to 8160 Cycles1 Cycle  2 Cycles**SupervisionPickup4 to 100%*0.1%  0.5 V   or   0.5%Time Delay1 to 8160 Cycles1 Cycle  2 Cycles**Pickup4 to 100%*0.1%  0.5 V   or   0.5%Time Delay1 to 8160 Cycles1 Cycle  2 Cycles** * Of nominal voltage.** When RMS (total waveform) is selected, timing accuracy is O  20 cycles or  1% 27 element response is selectable as positive sequence voltage or phase-to-phase voltage. Negative Sequence Overvoltage Pickup #1, #24 to 100%*0.1%  0.5 V   or   0.5%Time Delay #1, #21 to 8160 Cycles1 Cycle  2 Cycles * Of nominal voltage. Phase Overvoltage Pickup #1, #2100 to 150%*0.1%  0.5 V   or   0.5%Time Delay #1, #21 to 8160 Cycles1 Cycle  2 Cycles** * Of nominal voltage.** When RMS (total waveform) is selected, timing accuracy is O  20 cycles or  1%  Over/Under Frequency Pickup #1, #2, #3, #450.00 to 67.00 Hz0.01 Hz  0.03 Hz(40.00 to 57.00 Hz*)Time Delay #1,#2, #3, #42 to 65,500 Cycles1 Cycle  2 Cycles or  0.01% *This range applies to 50 Hz nominal frequency models.The pickup accuracy applies to 60 Hz models at a range of 57 to 63 Hz, and to 50 Hz models at a range of 47 to 53 Hz. The accuracy is  0.15 Hz for a range of 52 to 57 Hz and 63 to 67 Hz (for 60 Hz nominal) and 42 to 47 Hz and 53 to 57 Hz (for 50 Hz nominal). Rate of Change of Frequency Pickup #1, #20.10 to 20.00 Hz/Sec.0.01 Hz/Sec.  0.05 Hz/Sec. or  5%Time Delay #1, #23 to 8160 Cycles1 Cycle+ 20 CyclesNegative SequenceVoltage Inhibit0 to 99%1%  0.5% 27475981 27S47S 81R  –4–M-3401 Load Shedding Relay PROTECTIVE FUNCTIONS PROTECTIVE FUNCTIONS PROTECTIVE FUNCTIONS PROTECTIVE FUNCTIONS PROTECTIVE FUNCTIONS ((((( cont.cont.cont.cont.cont. ))))) DeviceDeviceDeviceDeviceDevice SetpointSetpointSetpointSetpointSetpointNumberNumberNumberNumberNumber FunctionFunctionFunctionFunctionFunction RangesRangesRangesRangesRanges IncrementIncrementIncrementIncrementIncrement AccuracyAccuracyAccuracyAccuracyAccuracy IPSlogic TM IPSlogic uses element trip commands, control/status input state changes, communica-tion points, output contact close signals to develop 2 programmable logic schemes. Time Delay #1–#21 to 8160 Cycles1 Cycle  1 Cycle or  1% Nominal Settings Nominal Voltage50 to 500 V*1 V—VT ConfigurationLine-Line/Line-Ground/Line-Ground-to-Line-Line**Seal-in Delay2 to 8160 Cycles1 Cycle  1 Cycle or  1% * Maximum measured range for (59) function setting is < 600 V.** When line-ground-to-line-line is selected, the relay internally calculates the line-line voltage from the line- ground voltages for all voltage-sensitive functions. When line-ground-to-line-line selection is applied, the nominal voltage selection should be the line-line nominal voltage (not line-ground nominal voltage). IPS

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