Chapter 11 Installation and Wiring
11-3
(5) Input average current consumption of input module (current consumption of simultaneous On point)
• W
in = lin X E X input point X simultaneous On rate (W)
I
in: Input current (actual value in case of AC) (A)
E
: Input voltage (voltage in actual use) (V)
(6) Current consumption of Special module power
•
WS = I5V X 5 + I24V X 24 + I100V X 100 (W)
As above, the value that added the current consumption calculated per each block is total current
consumption of PLC system.
•
W = WPW + W5V + W24V + Wout + Win + Ws (W)
Calculate the radiation amount according to this total current consumption (W) and review the
temperature rising in control panel.
The calculation formula of temperature rising in control panel is shown as below.
T = W / UA [°C]
W : Total current consumption of PLC system(the value obtained on the above
A : Surface area in control panel [m
2
]
U : In case of making the temperature in control panel by fan etc. - - 6
In case that the air in control panel is not circulated- - - - - - - - - - 4
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