Mitsubishi Electric Q172DCPU User Manual page 107

3 DESIGN
(5) Average power consumption of the input section of the input
module
(Power consumption for simultaneous ON points)
W = I E
IN IN
I : Input current (Effective value for AC) [A]
IN
E : Input voltage (Voltage in actual use) [V]
(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 for each block is the power
consumption of the overall sequencer system
W = W + W
PW 5V
From this overall power consumption [W], calculate the heating value and a rise
in ambient temperature inside the panel.
The outline of the calculation formula for a rise in ambient temperature inside the
panel is shown below.
W
T=
[ C ]
UA
W : Power consumption of overall Motion system (value obtained above)
A : Surface area inside the panel [m
U : When the ambient temperature inside the panel is uniformed by a fan ...... 6
When air inside the panel is not circulated.............................................. 4
POINT
If the temperature inside the panel has exceeded the specified range, it is
recommended to mount a heat exchanger to the panel to lower the temperature.
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.
Number of input points
24 + I 100 [W]
100V
+ W + W + W
24V OUT IN
3 - 14
Simultaneous ON rate [W]
+ W [W]
S
2
]