YOKOGAWA WT332E User Manual page 109

Examples of D/A Output
Voltage
When the voltage range is set to 150 V and 150 V (the rated range value) is applied, the D/A output is
+5 V.
When 100 V is applied, the output is 100 V/150 V × 5 V = 3.3 V.
Power
When the voltage range is set to 150 V and the current range is set to 5 A, the rated power range is
150 V × 5 A = 750 W.
If the measured power value is 750 W, the D/A output is +5 V.
When the measured power value is 300 W, the output is 300 W/750 W × 5V = 2.0 V.
Three-Phase Power (WT332E/WT333E)
When the voltage range is set to 150 V, the current range is set to 5 A, and a three-phase, three-wire
system is connected to elements 1 and 3, the rated power range of wiring unit Σ will be as follows.
(Rated power range of element 1) + (rated power range of element 3)
= 150 V × 5 A + 150 V × 5 A
=1500 W
If the measured power value for Σ is 1500 W, the D/A output is +5 V.
When the measured power value is 600 W, the output is 600 W/1500 W × 5V = 2.0 V.
1 For information about the power range of wiring unit Σ, see the table of Σ function expressions on
the second page of the appendix in the User's Manual, IM WT310E-01EN (PDF). This table shows
the expressions that the WT332E/WT333E uses to internally calculate the measured values. This
table also shows how to think about wiring unit measurement ranges. In this example, PΣ in the
table corresponds to P1 + P3 in the three-phase, three-wire (3P3W) column.
Integrated Power Values
When the voltage range is set to 150 V and the current range is set to 5 A, the rated power range is
150 V × 5 A = 750 W. In manual integration mode, when the rated integration time is set to 1 hour, the
rated electrical energy value is 750 W × 1 h = 750 Wh.
If you perform integration for 1 hour and the measured electrical energy is 750 W, the D/A output one
hour after integration starts is + 5 V.
If the measured electrical energy over 1 hour is 300 Wh, the output one hour after integration starts is
300 Wh/750 Wh × 5 V = 2.0 V.
The output 30 minutes after integration starts is 150 Wh/750 Wh × 5 V = 1.0 V.
IM WT310E-02EN
5.3 Producing D/A Output
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Index