VAMP Ltd
Power monitoring unit
Technical description
VAMP 260
VM260.EN004
Vamp 24h support phone : +358 (0)20 753 3264
33
Example 3
Coupling
=
Q
Scaled
minimum
=
−
2000 kVar
Scaled
maximum
=
6000
kVar
Analogue output minimum value =
4 mA
Analogue output maximum value =
20 mA
Q
(kVar)
(mA)
Analogue
output
4
8
12
16
20
-
2000
+6000
mAScaling_3
Figure 4.5.1-3. Example of mA scaling for bi-directional power. At –2000
kVar the transducer output is 4 mA, at 0 kVar it is 8 mA and at 6000 kVar
the output is 20 mA
4.5.2.
Exception control of analogue outputs
Each channel (AO1-AO4) has a possibility to output an excep-
tional current value if a monitored measured or calculated
value exceeds, goes under or equals a configurable limit value.
E.g. if a channel is linked to active power P and the output
scaling is 4 ... 20 mA the exception control sets the output
current to 2.50 mA whenever the average of the main voltages
U
LINE
(or any other monitored value) goes below 1000 V.
