Considerations On The Full Scale Value Calculation - Chauvin Arnoux ULYS FLEX Modbus Notice De Fonctionnement

4.3 CONSIDERATIONS ON THE FULL SCALE VALUE CALCULATION

The phase power full scale is the result of a multiplication between PT primary and phase X current full scale
(X=1, 2 or 3). If the PT primary and secondary values are set to 1 (direct connection), the phase power full scale
is the result of a multiplication between 290V and phase X current full scale (X=1, 2 or 3).
For the current full scale value to be used in the formula, consider the following values according to the selected
instrument scale:
Scale 500A > FS = 700A
A
Scale 4000A > FS = 5600A
A
Scale 20000A > FS = 28000A
A
Example: formula for phase 1 power full scale
FS = PT * FS
P1,S1,Q1 pri A1
The system power full scale is the result of a multiplication between 3 and PT primary and max phase current
full scale. If the PT primary and secondary values are set to 1 (direct connection), the system power full scale
is the result of a multiplication between 3 and 290V and max phase current full scale.
Example: formula for system power full scale
FS = 3 * PT * FS
P∑,S∑,Q∑ pri
MODBUS RTU/ASCII
if PT =PT =1 > FS
pri sec
if PT =PT
AMAX pri sec
= 290V * FS
P1,S1,Q1 A1
=1 > FS = 3 * 290V * FS
P∑,S∑,Q∑ AMAX
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