Chapter 9 Installation and Wiring
9-
(5) Average power consumption of input parts (with points simultaneously ON)
• W
in = lin
ለ
E
ለ
input points
ለ
the rate of points switched on simultaneously (W)
I
in : input current (effective value for AC) (A)
E : input voltage (actual operating voltage) (V)
(6) Power consumption of the special module
• W
S = I5V X 5 + I24V X 24 (W)
The sum of the above values is the power consumption of the entire PLC system.
• W = W
PW + W5V + W24V +Wout + Win + Ws (W)
Check the temperature rise within the control panel with calculation of that total power
consumption(W). The temperature rise in the control panel is expressed as:
T = W / UA [°C]
W : Power consumption of the entire PLC system(obtained as shown above)
A : Control panel inside surface area [m
2
]
U : if the control panel temperature is controlled by a fan, etc 6
if control panel air is not circulated 4
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