DIAM4200 ©2018 AUGIER SA.
6021642 DIAM4200 5 to 20KVA rev 1-8.docx
II-56
II.2.3.1 4-20mA current loop for output current and power measurements :
•
First output (J10):
I1
= 4 mA + (Io /10A) * 16 mA.
Example: for Io = 6.6 Arms, I1 = 4 mA + (6.6/10) * 16 mA = 14.56 mA
•
Second output:
I2
= 4 mA + (Output Power/Nominal Power) * 16 mA.
Example: For 15 kVA nominal power and 9.6 kVA in the loop (64% of the nominal power),
I2 = 4 mA + (9.6/15) * 16 mA = 14.24 mA
II.2.3.2 4-20mA loop current (ground insulation):
•
First output:
If R(
) earth >= 10M
, I1 = 4mA
If R(
) earth <= 1K
, I1 = 20mA
Between 1K
and 10M
, the loop current follows the ground value, according the curve
•
Second output: not used
1
10
100
1000
10000
20
16
12
8
4
R(
KOh
m
s
)
I(mA)
Current loop: R(KOhms) = f(I(mA))
R…
