P12x/EN T/Eb6 - Schneider - error

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P12x/EN FT/Eb6Page 34/62User GuideMiCOM P120/P121/P122/P1232.8.5 Submenu [37] UNDERCURRENT Protection (P122 & P123 only)Undercurrent function will:− start as soon as the current of one phase is below I< threshold value (OR of the 3 phasescurrent)− trip if the current of one phase - at least - remains below this threshold during more thantI
User GuideP12x/EN FT/Eb6MiCOM P120/P121/P122/P123 Page 35/62Autoreclose ?Ext CB Fail ?YesYesExt CB Fail Time.0.1 sExt Block ?YesRolling demand ?YesMax cycles nbTime period1010 mnSetting choice Yes or NoYes: the autoreclose function is enabled. Then the “ExtCB Fail ?” menu is displayed.Immediately could appear the message:“ConflictRecloser”.Do not worry, you are hardly beginning to set your ARCand some settings must be worked out.No: the autoreclose function is not enabled, and nomenu is activated.Allows the use of a dedicated input (CB FLT) to informthe autoreclose function of the state of the CB (failed oroperational). This signal has to be assigned to a digitalinput by the Automatic Control inputs submenuSetting choice Yes or No.Yes: The CB will be declared fault and the autoreclosewill move in the locked status when the Ext. CB Fail timewill be elapsed and the Ext CB Fail will stand active.No: the Ext Block submenu is activated.If “Ext CB Fail”=Yes option is selected only.Set the value for the external CB failure time delay tCFE.The Ext. CB Fail timer will start when the tD will beexpired. If during this time the signal Ext CB Fail willdisappear, the ARC will continue with its programmedcycles. Once this set time has elapsed, the informationExt CB Fail is validated. Setting range is from 10ms to600s (step 10ms).Setting choice: Yes or NoAllows the use of a dedicated input (Block_79) to blockthe autoreclose function.If you set this item to Yes to make it active you have toassign to a digital input the function Block 79 by theinputs submenu in Automatic control function. With theExt. Block actived (the relevant digital input supplied) theautoreclose will move to the locked status after aprotection trip involved in the sequences matrix of theARC.Setting choice: Yes or NoYes: activates the trip activity supervision. At the first triporder generated, the relay starts a temporization duringwhich, if the current trip number reaches theprogrammed max trips number, the relay stops thepending autoreclose cycle (definitive trip).Setting range from 2 to 100 (step 1).Sets the programmed maximum trip number.Setting range from 10 mn to 24 h (step 10mn).Sets the temporization for trip activity supervision.The dead time (tD1, tD2, tD3 and tD4) starts when the digital input connected to the 52a,auxiliary contact of the CB, is de-energised and the involved protection threshold reset. Itmeans that CB has tripped. If on trip protection the CB opening signal (52a) is lacking, aftera fixed time out of 2.00 s at 50 Hz or 1.67 s at 60 Hz, the ARC resets to the initial status. Ifon trip protection the 52a signal changes status but the protection threshold trip stands thetD timer will start when the protection trip threshold will disappear.In the above case NONE TIME OUT IS FORECASTED.The 52a signal has to assigned to a digital input by by the inputs submenu in Automaticcontrol function. The 52a signal is in accordance with the CB status.
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MiCOMP120/P121/P122/P123Overcurrent
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P12x/EN T/Eb6Page 2/2Technical Guid
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Pxxx/EN SS/G11Safety Section Page 1
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P12x/EN T/Eb6 - Schneider - error

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