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selected by the instrument depending on the selected VT
and CT value;
Example 2: it’s necessary to measure both the consumed
active power and the generated active power up to 100kW and
retransmit it with a signal from –10 to 10V; the module to be
used is AO1033 (2x ±10VCC) or AO1057 (1x ±10VCC). The
parameters may be set as follows:
• VARIA.: WΣ (active system power)
• MIN U.: 0,0% corresponds to -10V; the calculation formula
is: (100* min. output) / fullscale output = 100*0V / 20V = 0%;
in this case the whole range of the analogue output is to be
considered for the calculation, therefore -10 +10 = 20V.
• MAX U.: 100,0% corresponds to 10V, the calculation to be
carried out is: (100*maximum output)/fullscale
output=100*20V/20V=100%
• MIN IN: -100K; K,M and G multipliers are automatically
selected by the instrument depending on the selected VT
and CT value;
• MAX IN: 100,0 K; the K,M and G multipliers are automatically
selected by the instrument depending on the selected VT
and CT value; Therefore, when the power is equal to
-100kW, the output will be -10V, when the power is 0, the
output will be 0V and when the power is 100kW, the output
will be +10V.
Example 3: it’s necessary to retransmit the whole range of the
values admitted for the PF with a signal from 0 to 20mA. Pay
attention to the fact that the variable PF can correspond to the
values included between C 0,00 and L 0,00 (for each phase);
once these values are retransmitted, they will change into 0
and 20mA. When the PF will correspond to a value equal to 1
being at the centre between C0,00 and L0,00, the output value
will correspond to the centre of its scale, that is 10mA. As a
consequence, the instrument is to be set as follows:
• VARIA: PF L1 (or L2 or L3);
Useful information
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