2.8 Phase reversal/incorrect phase
sequence protection I2>> (47)
2 Protection functions Technical description
58
VAMP 24h support phone +358 (0)20 753 3264 VM50.EN004
For details of setting ranges see chapter 9.3.
Set = An editable parameter (password needed)
C = Can be cleared to zero
F = Editable when force flag is on
Recorded values of the latest eight faults
There is detailed information available of the eight latest
faults: Time stamp, unbalance current, elapsed delay and
setting group.
Recorded values of the current unbalance stage (8 latest
faults) I
2
> (46)
Parameter Value Unit Description
yyyy-mm-dd Time stamp of the recording, date
hh:mm:ss.ms Time stamp, time of day
Flt %Imot Maximum unbalance current
EDly %
Elapsed time of the operating
time setting. 100% = trip
SetGrp 1
2
Active setting group during the
fault
2.8. Phase reversal/incorrect phase
sequence protection I
2
>> (47)
The phase sequence stage prevents the motor from running in
the wrong direction, thus protecting the load.
When the ratio between negative and positive sequence current
exceeds 80%, the phase sequence stage starts and trips after
100 ms.
Parameters of the incorrect phase sequence stage I
2
>> (47):
Parameter Value/unit Description
Measured
value
I2/I1 %
Neg. phase seq. current/pos.
phase seq. current
SCntr Start counter (Start) reading
TCntr Trip counter (Trip) reading
Flt % Max. value of fault current
Recorded
values
EDly %
Elapsed time as compared to
the set operate time, 100% =
tripping
2.9. Stall protection I
st
> (48)
The stall protection unit I
st
> measures the fundamental
frequency component of the phase currents.
Stage I
st
> can be configured for definite time or inverse time
operation characteristic.
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