MiCOM P921/P922/P923 - Schneider - error

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P92x/EN CM/F22Page 10/26Commissioning GuideMiCOM P921/P922/P9234.2.3 Light Emitting Diodes (LEDs)On power up the green LED should have illuminated and stayed on indicating that the relayis healthy. The relay has non-volatile memory which remembers the state (on or off) of thealarm and trip LEDs when the relay was last energised from an auxiliary supply. Thereforethese indicators may also illuminate when the auxiliary supply is applied.If any of these LEDs are on then they should be reset before proceeding with further testing.If the LEDs successfully reset (the LED goes out), there is no testing required for that LEDbecause it is known to be operational.4.2.3.1 Testing the alarm LEDTo do this, activate the "Undervoltage" function, 1 st stage.If there is no voltage across the VT inputs, the "alarm" LED begins to flash and a messageappears on the front panel.4.2.3.2 Testing the trip LEDRepeat the previous test and allocate the time-delayed information (tV
Commissioning GuideP92x/EN CM/F22MiCOM P921/P922/P923 Page 11/264.2.5 Output relaysThis test checks that all the output relays are functioning correctly. (4 output relays for theP921 and 8 output relays for the P922-P923).The output relays should be energised one at a time.Connect a continuity tester across the terminals corresponding to output relay 1 given inTable 4.To actuate each output relay, activate the "Undervoltage" function, 1 st stage.Allocate the instantaneous information (V
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MiCOMP921/P922/P923Voltage and Freq
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MiCOM P921/P922/P923 - Schneider - error

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