Mitsubishi Electric C80 Series Connection And Set Up Manual page 100

C80 Series Connection and Setup Manual
5 Installation
(6) Power consumption of the external power supply section of the intelligent function module
W = I × 5 + I
S 5V 24V
The total of the power consumption values calculated in (1) to (6) becomes the C80 overall power consumption.
W = W + W + W
PW 5V
From this overall power consumption [W], calculate the heating value and a rise in ambient temperature inside the
control panel.
The outline of the calculation formula for a rise in ambient temperature inside the control panel is shown below.
W
T =
UA
W : C80 overall power consumption (value obtained above)
A : Surface area inside the control panel[m2]
U : When the ambient temperature inside the control panel is uniformed by a fan......6
When air inside the control panel is not circulated .................................................4
When a rise in ambient temperature inside the control panel exceeds the specified limit, it is recommended that you
install a heat exchanger in the control panel to lower the ambient temperature inside the control panel.
If a normal ventilating fan is used, dust will be sucked into C80 together with the external air. Note that it may affect
C80.
(7) Example of average power consumption calculation (R16NCCPU use)
(a) System configuration
R64P
(b) 5VDC/24VDC current consumption of each module
R04CPU (Note)
R16NCCPU
R173SXY
RX40C7 (Note)
RY40PT5P (Note)
RJ71EN71 (Note)
R38B (Note)
(Note) 5VDC current consumption of the MELSEC standard module may be changed. It must be always
confirmed in the latest manual.
(c) Power consumption of power module
= 3 / 7 × (0.67 + 1.70 + 0.20 + 0.11 + 0.13 + 0.82 + 0.71) × 5 = 9.30 [W]
W
PW
(d) Power consumption of a total of 5VDC logic section of each module
W = (0.67 + 1.70 + 0.20 + 0.11 + 0.13 + 0.82 + 0.71) × 5 = 21.70 [W]
5V
(e) A total of 24VDC average power consumption of the output module
W = 0.04 × 24 + 0.02 × 24 = 1.44 [W]
24V
(f) Average power consumption due to voltage drop in the output section of the output module
W = 0.1 × 0.2 × 24 × 1 + 0.5 × 0.3 × 16 × 1 = 2.88 [W]
OUT
(g) Average power consumption of the input section of the input module
W = 0.004 × 24 × 40 × 1 + 0.004 × 24 × 16 × 1 = 5.38 [W]
IN
(h) Power consumption of the external power supply section of the intelligent function module.
W = 0 [W]
S
(i) Power consumption of overall system
W = 9.30 + 21.70 + 1.44 + 2.88 + 5.38 = 40.70 [W]
× 24 + I × 100 [W]
100V
+ W + W + W [W]
24V OUT IN S
R04CPU R16NCCPU R173SXY
Unit 5VDC current consumption
0.67[A]
1.70[A]
0.20[A]
0.11[A]
0.13[A]
0.82[A]
0.71[A]
RY40
RX40C7 RJ71EN71
PT5P
24VDC current consumption
0.04[A]
0.02[A]
69
R38B
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IB-1501452-C