2726188 Phoenix Contact, 2726188 Datasheet - Page 159

• Manufacturer Part Number: 2726188
• Description: INTERBUS Bus Coupler
• Manufacturer: Phoenix Contact

Example:
Power dissipation of the
electronics
Power dissipation of the
housing
6452_en_02
A 5.2
This calculation is illustrated using the IB IL 24 DO 2-2A-PAC terminal as an example.
Formula to calculate the power dissipation of the electronics
This formula is terminal-specific and is provided in every data sheet.
P
Where
Both outputs are enabled and operating at full load. The load currents of the outputs are
I
According to the formula, the electronics of this specific configuration has the following
power dissipation:
P
P
P
P
The value for the power dissipation of the housing is specified in every terminal-specific data
sheet.
The permissible power dissipation of the housing for the IB IL 24 DO 2-2A-PAC terminal
depends on the temperature.
Where
At an ambient temperature of up to -5°C, you can load the housing with the maximum power
dissipation.
L1
P
i
n
I
If no output is set, the component with the sigma sign is omitted.
P
P
P
T
TOT
TOT
TOT
TOT
TOT
Li
A
TOT
HOU
HOU
HOU
= I
= 0.18 W +
L2
= 0.18 W + 2 x [0.20 W + (2 A)
= 0.18 W + 2 x 0.6 W
= 0.18 W + 1.20 W
= 1.38 W
= 2.4 W
= 2.4 W - [(T
= 2 A.
Power dissipation of the housing within the operating
temperature range depending on the ambient temperature
i = 1
Total power dissipation in the module
Index
Number of set outputs (n = 1 to 2)
Load current of output i
Power dissipation of the housing
Ambient temperature
∑
n
(0.20 W + I
A
Calculation examples for power dissipation and working points
- (-5°C))/37.5°C/W]
Li
2
x 0.10
2
x 0.10 Ω]
Ω
)
-25°C < T
-5°C < T
A
A
≤ +55°C
≤ -5°C
PHOENIX CONTACT
A-9