Mitsubishi Q170MCPU, User Manual

Page: 94 / 228

3 - 13
3 DESIGN
(5) Average power consumption of the input section of the input
module (Power consumption for simultaneous ON points)
W
IN
= I
IN
E Number of input points Simultaneous ON rate [W]
I
IN
: Input current (Effective value for AC) [A]
E : Input voltage (Voltage in actual use) [V]
(6) Power consumption of the external power supply section of the
intelligent function module
W
S
= I
+15V
15 + I
-15V
15 + I
24V
24[W]
I
+15V
: Power consumption of the +15VDC external power supply section of
the intelligent function module
I
-15V
: Power consumption of the -15VDC external power supply section of the
intelligent function module
I
24V
: Power consumption of the 24VDC external power supply section of the
intelligent function module
The total of the power consumption values calculated for each block is the power
consumption of the overall Motion system
W = W
5V
+ W
PW
+ W
24V
+ W
OUT
+ W
IN
+ W
S
[W]
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.
T=
W
UA
[ C ]
W : Power consumption of overall Motion system (value obtained above)
A : Surface area inside the panel [m
2
]
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.