4.5.1.3
Generator Frequency Monitoring
4.5.1.3.1
Plausibility Check of Voltages' AC Wiring
General Notes
The easYgen-3000XT detects the frequency out of up to six voltages (L1-N, L2-N, L3-N,
L1-L2, L2-L3 and L3-L1). The frequency measurement (of all three systems) additionally
checks the values on plausibility. With this monitoring the easYgen can detect wrong
wiring issues.
Wrong Wiring Issue
It might occur that for example a generator frequency is measured even if the generator
is not running. This can happen e.g. if PE (terminal 61) is not connected, the generator
neutral connection is broken, and mains is energized with 1Ph2W connection. In this case
a potential shift occurs which could lead to "ghostly" voltages at the generator (or
busbar, or mains) phase-neutral system. This voltages lead to a frequency measurement
even if no voltage is detected in the generator phase-phase system.
The »Plausibility AC wiring « monitoring is introduced to indicate such situations at
generator, busbar, and mains measurement. These alarms are tripping if only "Phase-
Phase" or only "Phase-Neutral" frequency is detected. If such an alarm ("Gen. AC wiring",
"Busbar 1 AC wiring" or "Mains AC wiring" has tripped please check all "Phase-Phase" and
"Phase-Neutral" voltages via HMI or Toolkit to get more information and check the AC
wiring.
This »Plausibility AC wiring « monitoring function is only active if the wiring can provide
"Phase-Phase" and "Phase-Neutral" values.
The plausibility monitoring offers one setting for all three measurement systems. The
Monitor is placed under: [Parameter / Configuration / Configure monitoring /
Miscellaneous / Other monitoring] .The alarm indications are called Gen. .../Busbar .../
Mains AC wiring (see
).
ID
Parameter
CL
Setting range
[Default]
Description
1964
Monitoring
2
[On]
Enabling Plausibility AC Wiring
monitoring.
Off
Monitoring is disabled
1965
Delay
2
00.2 to 99.99 s
[00.30]
If the monitored value
undershoots the threshold value
for the delay time configured
here, an alarm will be issued.
1966
Alarm class
2
Class A, Class B, Class C, Class D,
Class E, Class F , Control
[Class B]
Each limit may be assigned an
independent alarm class that
specifies what action should be
taken when the limit is surpassed.
1967
Self acknowledge
2
[Yes]
The control unit automatically
clears the alarm if the fault
condition is no longer detected.
No
The control unit does not
automatically reset the alarm
428
easYgen-3000XT Series
B37574
4 Configuration
4.5.1.3 Generator Frequency Monitoring
Released