LED Indication of Micom P120, P121, P122 and P123 relay

The MiCOM P120, P121, P122 and P123 relay front panel serves as an interface between the user and the protection relay. It enables the user to enter relay settings, display the measured values, alarms and display clearly the various actions carried out by MiCOM P120, P121, P122 and P123 relay.

The LED labels on the front panel are by default written in English, however the user has self-adhesive labels available with MiCOM relays in French on which it is possible to write using a ball point pen. The top four LEDs indicate to the status of the relay (Trip condition, alarm LED, equipment failure, auxiliary supply). The four lower LEDs can be freely programmed by the user to correspond to operation of the various thresholds (all models) and copy of the state of the logic inputs (P122 & P123 ONLY). Eight LEDs are located in the left portion of the front face (numbered from 1 to 8 starting from the top)

LED 1 Colour : RED Label : Trip

LED 1 indicates when a trip order has been issued by the relay to the cut-off element (circuit breaker, contactor). This LED recopies the trip order issued to the Trip logic output. Its normal state is unlit. It is illuminated as soon as a triggering order is issued. It goes out when the associated alarm is acknowledged either by front panel, or by remote command, or by digital input, or by a new fault (CONFIGURATION/Alarms menu).

LED 2 Colour : ORANGE Label : ALARM

LED 2 indicates that an alarm has been registered by MiCOM P120, P121, P122 and P123 relays. The alarms are either threshold crossings (instantaneous), or tripping orders (time delayed). As soon as an alarm is registered, the LED flashes. When all the stored alarms are read, the LED is illuminated continuously. When all the alarms are acknowledged, the LED goes out.

NOTE : the alarms concerning the instantaneous can be selected self reset Yes or No in the CONFIGURATION/Alarms Menu. The alarm LED can be reset either by front panel, or by remote command, or by digital input, or by a new fault (CONFIGURATION/Alarms menu).

LED 3 Colour : ORANGE Label : Warning

LED 3 is dedicated to the internal alarms of MiCOM P120, P121, P122 and P123 relays. When a « non critical » internal alarm (typically communication Fault) is detected, the LED flashes continuously. When the fault is classed as « critical », the LED is illuminated continuously. The extinction of this LED is only possible by the disappearance of the cause that provoked it (repair of the module, disappearance of the Fault).

LED 4 Colour : GREEN Label : Healthy

LED 4 indicates that MiCOM P120, P121, P122 and P123 relays is auxiliary powered in the nominal range.

LED 5 to 8 Colour : RED Label : Aux.1 to 4.

These LEDs can be programmed by the user on the basis of information on available thresholds (instantaneous and time-delayed) and state of the logic inputs (P122 & P123 only). The user selects the information he wishes to see associates with each LED from the menu element (Logic OR). Each LED illuminates when the associated information is valid. The extinction of each LED is linked to the acknowledgement of the associated alarms.

Incoming search terms:

• cara setting micom P122
• micom p121
• micom p122 led labels
• micom p123 alarm led