MiCOM P921/P922/P923 - Schneider - error

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P92x/EN FT/H42Page 14/70Technical GuideUser GuideMiCOM P921/P922/P923To clear all alarm messages press ; to return to the display of the first alarmmessage and leave the alarms uncleared, press . There is no need to enter apassword before the alarm messages can be cleared. When the alarms have beencleared the yellow alarm LED will extinguish, as will the red trip LED if it wasilluminated following a trip.The alarm messages are classified as indicated below:• Electrical system alarms,• Relay hardware or software alarms.1.4.1 Electrical Network AlarmsAny crossing of a threshold (instantaneous or time delay) generates an "electricalnetwork alarm". The involved threshold is indicated. Regarding the phasethresholds, the phase designation (A, B or C) is also displayed.For example:V< 2/3PHASE AB BC CANOTE: Instantaneous information leads to a self-resetting alarmmessage. The alarm LED will then be switched off as soon as theinstantaneous information has disappeared.If several alarms are triggered, they are all stored in their order of appearance andpresented on the LCD in reverse order of their detection (the most recent alarm first,the oldest alarm last). Each alarm message is numbered and the total number ofalarm messages is displayed.The user can read all the alarm messages pressing .The user acknowledges and clears the alarm messages from the LCD pressing .The user can acknowledge each alarm message one by one or all by going to theend of the list to acknowledge, and clear, all the alarm messages pressing .The control of the ALARM LED (LED 2) is directly assigned to the status of thealarm messages stored in the memory.If one or several messages are NOT READ and NOT ACKNOWLEDGED, theALARM LED (LED 2) flashes.If all the messages have been READ but NOT ACKNOWLEDGED, the ALARM LED(LED 2) lights up continuously.If all the messages have been ACKNOWLEDGED, and cleared, if the cause thatgenerated the alarm disappears, the ALARM LED (LED 2) is extinguished.1.4.2 Relay Hardware or Software Warning MessagesAny software or hardware fault internal to MiCOM relay generates a"hardware/software alarm" that is stored in memory as a "Hardware Alarm". Ifseveral hardware alarms are detected, they are all stored in their order ofappearance. The warning messages are presented on the LCD in reverse order oftheir detection (the most recent first and the oldest last). Each warning message isnumbered and the total stored is shown.
Technical GuideP92x/EN FT/H42User GuideMiCOM P921/P922/P923 Page 15/70If an hardware error appears, the following prompt will appear:HARDWARE ALARMSThe user can read all warning messages pressing , without entering thepassword: for example,STATS ERROR 1/1It is not possible to acknowledge and clear warning messages caused by internalrelay hardware or software failure. This message can only be cleared once thecause of the hardware or software failure has been removed.The control of the WARNING LED (LED 3) is directly assigned to the status of thewarning messages stored in the memory.Alarms can be classified as minor or major faults. If the internal hardware orsoftware failure is major (i.e. the relay cannot perform protection functions), theWARNING LED (LED 3) lights up continuously.− major fault: Protection and automation functions of the equipment are blocked. Inthis condition, the protection relay detects the corresponding fault and activatesRL0 Watchdog relay (35-36 terminals contact is closed – “relay failed” position).For instance: the “DEF. ANA” fault (fault in the analog circuit channel) isconsidered as a major fault because the protection functions will not operatecorrectly.− minor fault: Protection and automation functions of the relay operate. A minorfault will not activate RL0 Watch Dog relay (35-36 terminals contact is closed, 36-37 terminals is open). This fault causes a LED alarm and is displayed on the LCDpanel.The Watch Dog relay controls the correct operation of the protection and automationfunction. This relay fault “RL0 relay” is activated if the following functions or checksare faulty:− microprocessor operation,− power supply check,− reconstituted internal power supply check,− heating of a circuit board component monitoring,− analog channel monitoring (acquisition sampling),− programm execution monitoring,− communication ports monitoring.If the internal hardware or software failure is minor (like a communication failure thathas no influence on the protection and automation functions), the WARNING LED(LED 3) will flash.Possible Hardware or Software alarm messages are:
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MiCOMP921/P922/P923Voltage and Freq
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Pxxx/EN SS/G11Safety Section Page 1
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