Power Loss; Derating; Formula For Calculation Of The Power Loss Of The Electronics - Burkert 8644 AirLINE Instructions De Service

POWER LOSS

Formula for calculation of the power loss of the electronics

P = P + P
EL Bus Peri
P = 2.6 W + (1.1
EL
Where
P Total power loss in the terminal
EL
P Power loss for bus operation without peripheral loading (constant)
BUS
P Power loss with periphery connected
PERI
I Current consumption of participant n from logic supply
LN
n Index designating the number of participants connected (n = 1 to a)
a Number of participants connected (supply with logic voltage)
Σ
I
Sum of all current consumed by participants from the 7.5 V logic supply (max. 2 A)
Ln
a
n=0
I Current consumption of participant m from analog supply
LM
m Index designating the number of analog participants connected (m = 1 to b)
b Number of analog participants connected (supply with analog voltage)
b
Σ
I
Sum of all current consumed by participants from the 24 V analog supply (max. 0.5 A)
Lm
m=0

Derating

Substituting the maximum currents of 2 A (logic) and 0.5 A (for analog terminals) in the formula for
calculation of the power loss with periphery connected, we obtain:
P = 2.2 W + 0.35 W = 2.55 W
PERI
This 2.55 W corresponds to 100 % network loading capacity in the derating curves.
ATTENTION!
Make sure that at an ambient temperature above 40 °C, the nominal loading capacity
given by the derating curves is not exceeded. As can be seen from the formula, the total
loading with attached periphery (P
is consumed by the analog supply, the fraction of the current from the logic supply may
be greater.
Type 8644
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D
ESCRIPTION OF
W a W
Σ Σ Σ Σ Σ
Ι Ι Ι Ι Ι
x ) + (0.7
A A
Ln
n=0
O S
VERALL YSTEM
b
Σ Σ Σ Σ Σ
Ι Ι Ι Ι Ι
x )
Lm
m=0
) is the relevant quantity. If for example no current
PERI
B - P
ÜRKERT HOENIX
PH 9