Mitsubishi Electric Q173CPU User Manual page 137

3 DESIGN
(6) Power consumption of the power supply section of the intelligent
function module
W = I 5 + I
S 5V 24V
The total of the power consumption values calculated for each block becomes
the power consumption of the overall Motion system.
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=
[ C ]
UA
W : Power consumption of overall Motion system (value obtained above)
A : Surface area inside the control panel[m
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
POINT
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 the Motion controller
together with the external air, and it may affect the performance of the Motion
controller.
(7) Example of average power consumption calculation
(Q173CPUN use)
(a) System configuration
(b) 5 VDC current consumption of each module
Q02HCPU
Q173CPUN
Q172LX
Q172EX
Q173PX
QX40
QY10
Q38B
(c) Power consumption of power module
W = 3/7 (0.64 + 1.25 + 0.05 + 0.07 + 0.11 + 0.05 + 0.05 + 0.43 + 0.43 +
PW
0.114) 5 = 6.84 [W]
(d) Power consumption of a total of 5 VDC logic section of each module
W = (0.64 + 1.25 + 0.05 + 0.07 + 0.11 + 0.05 + 0.05 + 0.43 + 0.43 +
5V
0.114) 5) = 15.97 [W]
24 + I 100 [W]
100V
+ W + W + W
24V OUT IN
: 0.64 [A]
: 1.25 [A]
: 0.05 [A]
: 0.07 [A]
: 0.11 [A]
: 0.05 [A]
: 0.43 [A]
: 0.114 [A]
3 - 18
+ W [W]
S
2
]
Q38B