Parameters
B
Nominal line voltage
The nominal voltage is the value of the electrical voltage during normal operation specied by
the manufacturer. The nominal voltage is usually stated with a maximum permissible tolerance
range. In Europe, the nominal value of the line voltage, the nominal line voltage, is 230 V (line /
neutral) or 400 V (line / line).
(Warning) threshold for voltage asymmetry
Voltage asymmetry is the dierence between the highest and the lowest phase voltage in
relation to the highest phase voltage (Ux-y max - Ux-y min) / Ux-y max.
Note
Deviation from the denition according to IEC/NEMA
The denition given above for voltage asymmetry deviates from the denition according to IEC/
NEMA. It usually results in a greater value for voltage asymmetry than that arrived at from the
denition according to IEC/NEMA, so that a higher level of measuring accuracy is achieved.
Voltage asymmetry can be parameterized as "Threshold for voltage asymmetry" or as "Warning
threshold for voltage asymmetry" (only on devices for IO-Link).
If the warning threshold is reached on device variants for IO-Link, this is transmitted cyclicly via
IO-Link and the relevant bits are set in the diagnostics data set or the semiconductor output
(terminal C/Q) is switched in SIO mode.
If the threshold has been reached, the output relays are switched accordingly and an IO-Link
message may be sent.
Possible indications on the display: Asy (threshold), possibly Asy! (warning threshold)
Tripping delay time
If the measured value overshoots or undershoots the set limit value, the delay time that can be
set using the "Tripping delay time" parameter starts. On expiry of this time, the switching contact
changes state and a message may be sent via IO-Link.
Possible indications on the display:
• Tripping delay time in the case of voltage undershoot: U▼Del
• Tripping delay time in the case of voltage overshoot: U▲Del
• Tripping delay time in the case of (active) current undershoot: I▼Del
• Tripping delay time in the case of (active) current overshoot: I▲Del
• Tripping delay time in the case of speed undershoot: ▼Del
SIRIUS 3UG4 / 3RR2 monitoring relay
Equipment Manual, 07/2021, NEB927043002000/RS-AD/005 281
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