VAMP 257
Feeder and motor manager
Technical description
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VAMP 24h support phone : +358 (0)20 753 3264
VM257.EN002
If a stage is configured as an underfrequency stage then it
functions as explained in paragraph 2.3.21.
When a stage is configured as an overfrequency stage, it starts
if the actual value of the frequency exceeds the setting value. If
the overfrequency situation continues after the start delay has
elapsed, the function trips.
Figure 2.3.20-1. Block diagram of the overfrequency stages f> and f>>
Setting parameters of overfrequency and underfrequency
stages:
f><, f>><< (81)
Parameter Value
Unit Default
Description
f><, f>><<
40.0…70.0
Hz
51.0 (f><)
52.0 (f>><<)
Frequency setting
t><, t>><< 0.10…300.0
s
0.20 (t><)
0.10 (t>>><)
Definite operation
time
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
Mode
> or <
.
>
Frequency protection
mode
LVBlck 2…100 %Un
40
Configurable low
voltage blocking limit.
Common for f><, f<
and f><><, f<<
