VAMP 257
Feeder and motor manager
Technical description
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VM257.EN002
Setting parameters of df/dt stage:
Parameter Value
Unit Default Description
df/dt
0.2 ... 10.0
Hz/s
5.0
df/dt pick-up setting
t>
0.14 … 10.0
s
0.50
df/dt operational delay
t
Min
>
0.14 … 10.0
s
0.50
df/dt minimum delay
S_On
Enabled;
Disabled
- Enabled
Start
on
event
S_Off
Enabled;
Disabled
-
Enabled
Start off event
T_On
Enabled;
Disabled
- Enabled
Trip
on
event
T_Off
Enabled;
Disabled
-
Enabled
Trip off event
Measured and recorded values of df/dt stage:
Parameter Value Unit Description
f Hz
Frequency
Measured
value
df/dt
Hz/s
Frequency rate of
change
SCntr -
Start counter (Start)
reading
TCntr -
Trip counter (Trip)
reading
Flt
%Hz/s
Max rate of change
fault value
Recorded
values
EDly
%
Elapsed time as
compared to the set
operating time, 100%
= tripping
2.3.23.
Second harmonic stage / inrush (68)
This stage is mainly used to block other stages. The ratio
between the second harmonic component and the fundamental
frequency component is measured on all the phase currents.
When the ratio in any phase exceeds the setting value, the
stage gives a start signal. After a settable delay, the stage gives
a trip signal.
The start and trip signals can be used for blocking the other
stages. The trip delay is irrelevant if only the start signal is
used for blocking.
The trip delay of the stages to be blocked must be 100 ms or
more to ensure a proper blocking.