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

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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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Technical Reference Manual, General
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1, 9 CMVO
1, 9 CMTCS1
1, 9 ROV1Low
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1, 9 ROV1High
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1, 9 ROV1Inst
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1, 9 OV3High
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1, 9 UV3Low
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1, 9 UV3High
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1,9 Freq1St1
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1,9 Freq1St2
1 Freq1St2
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