Appendix 11 Calculating Heating Value Of Programmable Controller; Appendix 11.1 Calculating The Average Power Consumption - Mitsubishi Electric MELSEC L Series User Manual

Appendix 11
The ambient temperature inside the control panel where a head module is installed must be 55 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.
This section describes the calculation method of the average power consumption of a programmable controller
system.
Calculate a rise in ambient temperature inside the control panel according to the power consumption.
Appendix 11.1
The total of the power consumption calculated for each block is the power consumption of the entire programmable
controller system.
W = W
PW
Calculate a heating value and a rise in ambient temperature inside the control panel according to the calculated power
consumption (W).
The calculation formula for a rise in ambient temperature inside the control panel is as follows.
W
T=
UA
W: Power consumption of the entire programmable controller system
A: Surface area inside the control panel []
U (=6): When the ambient temperature inside the control panel is uniformed using a fan
U (=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
● If a general-purpose fan is used, dust will be sucked into the control panel with the external air. This may affect the
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Calculating Heating Value of Programmable
Controller
Calculating the average power consumption
+ W + W + W + W
5V 24V OUT IN
exchanger to the panel to lower the temperature.
performance of the programmable controller.
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+ W (W)
S
APPENDICES
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