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ABB Industrial IT enabled REX 521 Technical Reference Manual, General page 59

Protection relay
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Auxiliary input 1 (Digital input 6)
Auxiliary input 2 (Digital input 7)
Auxiliary input 3 (Digital input 8)
Auxiliary input 4 (Digital input 9)
Auxiliary input 5 (Digital input 1)
Auxiliary input 6 (Digital input 2)
Auxiliary input 7 (Digital input 3)
Auxiliary input 8 (Digital input 4)
Auxiliary input 9 (Digital input 5)
Output relay 1 position (HSPO1)
Output relay 2 position (PO1)
Output relay 3 position (PO2)
Output relay 4 position (PO3)
Output relay 5 position (SO1)
Output relay 6 position (SO2)
Test mode ON/OFF
DREC
Recorder full memory
DREC
Recorder triggered
CB WEAR
CB1 wear alarm
MCS 3I
Current input circuit supervision
MCS 3U
Voltage input circuit supervision
TCS1
Trip-circuit supervision
Uo>
Residual overvoltage general START
Uo>
Residual overvoltage TRIP>
Uo>>
Residual overvoltage START>>
Uo>>
Residual overvoltage TRIP>>
Uo>>>
Residual overvoltage START>>>
Uo>>>
Residual overvoltage TRIP>>>
U1<U1U2>
Phase sequency voltage protection, St1, START U2>
U1<U1U2>
Phase sequency voltage protection, St1, START U1<
U1<U1U2>
Phase sequency voltage protection, St1, START U1>
U1<U1U2>
Phase sequency voltage protection, St1, TRIP U2>
U1<U1U2>
Phase sequency voltage protection, St1, TRIP U1<
U1<U1U2>
Phase sequency voltage protection, St1, TRIP U1>
3U>
Overvoltage general START
3U>
Overvoltage TRIP>
3U>>
Overvoltage START>>
3U>>
Overvoltage TRIP>>
3U<
Undervoltage general START
3U<
Undervoltage TRIP<
3U<<
Undervoltage START<<
3U<<
Undervoltage TRIP<<
SYNC1
Synchro-check/voltage check, St 1, SC Due
SYNC1
Synchro-check/voltage check, St 1, SC Ok
SYNC1
Synchro-check/voltage check, St 1, Alarm not passed
f1
Underfrequency or overfrequency, St1, START1
f1
Underfrequency or overfrequency, St1, TRIP1
f1
Underfrequency or overfrequency, St1, START2
f1
Underfrequency or overfrequency, St1, TRIP2
f2
Underfrequency or overfrequency, St2, START1
f2
Underfrequency or overfrequency, St2, TRIP1
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1,9 Freq1St2
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59

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