Mitsubishi Q01CPU User Manual page 252

10
LOADING AND INSTALLATION
(3) A total of 24 VDC average power consumption of the output module
(4) Average power consumption due to voltage drop in the output section of
(5) Average power consumption of the input section of the input module
(6) Power consumption of the external power supply section of the
The total of the power consumption values calculated for each block becomes the power
consumption of the overall sequencer system.
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.
10
- 8 10.2 Calculating Heat Generation of Programmable Controller
(power consumption for simultaneous ON points)
The average power of the external 24 VDC power is the total power consumption of
each module.
W = I 24 Simultaneous ON rate (W)
24V 24V
the output module
(Power consumption for simultaneous ON points)
W = I Vdrop Number of outputs Simultaneous ON rate (W)
OUT OUT
I : Output current (Current in actual use) (A)
OUT
Vdrop : Voltage drop in each output module (V)
(Power consumption for simultaneous ON points)
W = I E Number of input points Simultaneous ON rate (W)
IN IN
I : Input current (Effective value for AC) (A)
IN
E : Input voltage (Voltage in actual use) (V)
intelligent function module
W = I 15+I 15+I
S +15V -15V
W = W +W +W
PW 5V
W
T =
C
UA
W : Power consumption of overall sequencer system (value obtained above)
A : Surface area inside the panel
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 install a heat exchanger to the panel to lower the temperature.
If a normal ventilating fan is used, dust will be sucked into the programmable
controller together with the external air, and it may affect the performance of the
programmable controller.
24 (W)
24V
+W +W +W (W)
24V OUT IN S