Elgama G1B Series - Over-Voltage Monitor; Under-Voltage Monitor

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I
rms
, A
I
lim
, A
I
lim-hyst
, A
Event log entry
1
Counter
0001 0000 0000
0
t
t
t
Timer, s
t
Figure 9-2 Algorithm of current monitor
9.3 Over-voltage monitor
Meter monitors RMS value of voltage U
rms
and registers events, when voltage exceeds over-
voltage limit U
over
. RMS value of voltage U
rms
is measured every second. If at certain moment
voltage value U
rms
exceeds over-voltage limit (U
rms
>U
over
), meter registers event “Over-voltage”
(algorithm is similar to over-current, presented in Figure 9-2). As soon as the voltage value drops
below limit-hysteresis level (U
rms
<U
over-hyst
), another event is registered, indicating end of over-
voltage. Such kind of events is recorded in a dedicated event log “Over-voltage” (see chapter
8.5.2). Each entry contains time stamp and status, indicating level (above or below limit) of
voltage. Furthermore, a dedicated counter counts the number of occurrences [0.9999] of “over-
voltage” events, as well as a dedicated timer measures the total duration [099,999,999 s] of all
“over-voltage” events.
Limit values U
over
and U
over-hyst
can be parameterized independently in V (Volts) units.
9.4 Under-voltage monitor
Meter monitors RMS value of voltage U
rms
and registers events, when voltage drops below under-
voltage limit U
under
. RMS value of voltage U
rms
is measured every second. If at certain moment any
voltage value U
rms
drops below under-voltage limit (U
rms
<U
under
), meter registers event “under-
voltage” (see Figure 9-3). As soon as the voltage value exceeds limit+hysteresis level
(U
rms
>U
under+hyst
), another event is registered, indicating end of under-voltage. Such kind of events
is recorded in a dedicated event log “under-voltage” (see chapter 8.5.3). Each entry contains time
stamp and status, indicating level (below or above limit) of voltage. Furthermore, a dedicated
counter counts the number of occurrences [0.9999] of “under-voltage” events, as well as a
dedicated timer measures the total duration [099,999,999 s] of all “under-voltage” events.
Limit values U
under
and U
under+hyst
can be parameterized independently in V (Volts) units.