Output signal Description
RFAULT Estimated fault resistance in Ω
ZREF Selected reference impedance number
ZREFRE The real part (resistance) of the used reference impedance
ZREFIM The imaginary part (reactance) of the used reference impedance
URMSSTAT This signal is set true, if the measured RMS voltage is larger than the set limit
ULimRMS
IRMSSTAT This signal is set true, if the measured RMS current is larger than the set limit
ILimRMS
ERRSTAT output signal
Convert the integer output signal to binary and see table below for interpretation of
individual bits:
Table 135: Definition of errors
ERRSTAT output integer
Priority 3 Priority 2 Priority 3 Priority 1
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Interfer-
ence
detected
Under-
current
Under-
voltage
Over-
current
Over-
voltage
Frequ-
ency
difference
No
current
No
voltage
The ERRSTAT description will be shown in clear text in ICT.
The priority of the signals is set that the group priority 1 overrides the group priority
2 and 3, and priority 2 overrides priority 3. Note that the ERRSTAT signal can enable
several error cases at the same time.
Following errors is detected and derived in the Error block:
• B0 = Injected voltage signal not found
• B1 = Injected current signal not found
• B2 = Voltage and current signal frequency differs
• B3 = Measured total RMS voltage too high
• B4 = Measured total RMS current too high
• B5 = Injected voltage signal too low
• B6 = Injected current signal too low
• B7 = External interference voltage detected
ERRSTAT = BitToInt[B7,…,B1,B0] The priority of the error conditions that will be
flagged out:
• Prio1 = B0, B1
• Prio2 = B3, B4, B5, B6
• Prio3 = B2, B7
RFAULT output signal
1MRK502052-UEN B Section 7
Impedance protection
295
Technical manual
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