Permissible Operating Temperature Range - GE VersaPoint IC220PBI002 User Manual

C

Permissible Operating Temperature Range

With an increased ambient temperature, you must calculate the permissible
operating temperature range for the calculated power loss.
Set P
tot
P = 2.4W - [(T
tot
After changing the formula, the maximum permissible ambient temperature
is calculated with this load as:
T = (2.4W - P
U
P = 1.38W (from the calculated power loss of the electronics)
tot
T = (2.4W - 1.38W) x 37.5K/W - 5°C
U
T = 1.02W x 37.5K/W - 5°C
U
T = 33.25°C
U
With full load on both outputs, you can operate this module up to an ambient
temperature of 33°C (91.4°F). If you never operate the outputs
simultaneously and if a set output consumes a current of 2A you can
operate the module up to:
P = 0.18W + 1 x [0.20W + (2A)
tot
P = 0.18W + 0.60W
tot
P = 0.78W
tot
T = (2.4W - P
U
P = 0.78 W (from the calculated power loss of the electronics)
tot
T = (2.4W - 0.78W) x 37.5K/W - 5°C
U
T = 1.62W x 37.5K/W - 5°C
U
T = 55.75°C
U
T = 55°C (maximum permissible ambient temperature)
U
As the maximum permissible ambient temperature is 55°C (131°F) you can
work in the entire permissible temperature range under the above
mentioned conditions. This leads to a simultaneity of 50% at 55°C indicated
in the data sheet.
C-4 VersaPoint™ I/O System Profibus-DP NIU User's Manual – August 2005
= P .
HOU
+ 5°C) / 37.5K/W]
U
) x 37.5K/W - 5°C
tot
) x 37.5K/W - 5°C
tot
x 0.1Ω)]
2
GFK-1911B