Appendix 9 Calculating Heating Value Of Programmable Controller; Calculation Formula For The Average Power Consumption - Mitsubishi Electric MELSEC iQ-R Series Configuration Manual

Appendix 9
The ambient temperature inside the control panel where a programmable controller is installed must be 55 or less
*1 When an extended temperature range base unit is used, the ambient temperature must be 60 or less.
It is necessary to know the average power consumption (heating value) of the equipment and devices installed inside the
control panel when designing a heat release structure of the panel.
Calculate a rise in ambient temperature inside the control panel according to the following calculation formula.
The calculation formula for a rise in ambient temperature inside the control panel is as follows.
W
T = (˚C)
UA
W: Average power consumption of the entire programmable controller system ( Page 193 Calculation formula for the
average power consumption)
A: Surface area inside the control panel ()
U: 6 when the ambient temperature inside the control panel is uniformed using a fan or 4 when the air inside the control panel
is not circulated
If the temperature inside the control panel is expected to exceed the specified range, it is recommended to
install a heat exchanger to the panel to lower the temperature.
If a general-purpose fan is used, dust will be sucked into the control panel with the external air. This may affect
the performance of the programmable controller.

Calculation formula for the average power consumption

The power power consumption of the programmable controller are roughly classified into six blocks: W
W , W The total of the power consumption calculated for each block is the power consumption of the entire programmable
IN S
controller system.
W = W + W + W + W
PW 5V 24V
Calculate a heating value and a rise in ambient temperature inside the control panel according to the calculated power
consumption (W).
For the calculation formula for each block, refer to the following.
• W ( Page 194 Power consumption of a power supply module)
PW
• W ( Page 194 Total of the internal current consumption 5VDC of each module)
5V
• W ( Page 194 Total of the 24VDC average power consumption of the output module)
24V
• W ( Page 194 Average power consumption when the voltage drop of the output module occurs)
OUT
• W ( Page 194 Average power consumption at the input section of the input module)
IN
• W ( Page 194 Power consumption of the external power supply used for each module)
S
The total current consumption of each module can be checked by the engineering tool.
Calculating Heating Value of
Programmable Controller
+ W + W (W)
OUT IN S

Appendix 9 Calculating Heating Value of Programmable Controller

*1
.
, W , W , W ,
PW 5V 24V OUT
APPX
193
A