2726188 Phoenix Contact, 2726188 Datasheet - Page 160

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

IL SYS INST UM E
Permissible working point
A-10
PHOENIX CONTACT
At an increased ambient temperature, you must calculate the permissible working point for
the calculated power dissipation.
To do this set P
P
After changing the formula, the maximum permissible ambient temperature, with this load,
is calculated as:
T
P
T
T
T
With both outputs at full load, this terminal can be operated up to an ambient temperature
of 33°C.
If you never operate the outputs simultaneously and if a set output consumes a current of
2 A, you can operate up to an ambient temperature of:
P
P
P
T
P
T
T
T
T
As the maximum permissible ambient temperature is 55°C, you can operate under the
conditions specified above in the entire permissible temperature range. This results
in a simultaneity of 50% at 55°C as specified in the data sheet.
A
A
A
A
A
A
A
A
A
TOT
TOT
TOT
TOT
TOT
TOT
= (2.4 W - P
= (2.4 W - 1.38 W) x 37.5°C/W - 5°C
= 1.02 W x 37.5°C/W - 5°C
= 33.25°C
= (2.4 W - P
= (2.4 W - 0.78 W) x 37.5°C/W - 5°C
= 1.62 W x 37.5°C/W - 5°C
= 55.75°C
= 55°C (maximum permissible ambient temperature)
= 2.4 W - [(T
= 1.38 W (from the calculation for the power dissipation of the electronics)
= 0.18 W + [0.20 W + (2 A)
= 0.18 W + 0.60 W
= 0.78 W
= 0.78 W (from the calculation for the power dissipation of the electronics)
TOT
TOT
TOT
A
) x 37.5°C/W - 5°C
) x 37.5°C/W - 5°C
= P
+ 5°C)/37.5°C/W]
HOU
.
2
x 0.10 Ω]
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