Mitsubishi Q01CPU User Manual

10
LOADING AND INSTALLATION
10.2 Calculating Heat Generation of Programmable Controller
10 - 7
9
EMC AND LOW VOLTAGE DIRECTIVES
10
LOADING AND INSTALLATION
11
MAINTENANCE AND INSPECTION
12
TROUBLESHOOTING APPENDICES INDEX
10.2 Calculating Heat Generation of Programmable Controller
The ambient temperature inside the panel storing the programmable controller must be
suppressed to an ambient temperature of 55 or less, which is specified for the
programmable controller.
For the design of a heat releasing panel, it is necessary to know the average power
consumption (heating value) of the devices and instruments stored inside.
Here the method of obtaining the average power consumption of the programmable
controller system is described.
From the power consumption, calculate a rise in ambient temperature inside the panel.
The power consuming parts of the programmable controller are roughly classified into six
blocks as shown below.
(1) Power consumption of power supply module
The power conversion efficiency of the power supply module is approx. 70 %, while
30 % of the output power is consumed as heat. As a result, 3/7 of the output power is
the power consumption.
Therefore the calculation formula is as follows.
I
5V
: Current consumption of logic 5 VDC circuit of each module
I
15V: Current consumption of 15VDC external power supply part of intelligent function
module
I
24V: Average current consumption of 24VDC power supply for internal consumption of the
output module
POINT
In a redundant power supply system configuration, the same calculation method
is applied.
(When 2 redundant power supply modules are placed in parallel, they run sharing
the load current half-and-half.)
(2) Total power consumption for 5VDC logic circuits of all modules
(including CPU module)
The power consumption of the 5 VDC output circuit section of the power supply
module is the power consumption of each module (including the current consumption
of the base unit).
W
5V
= I
5V
5 (W)
* : For the power consumption of the motion CPU and PC CPU module, refer to the instruction
manuals of the corresponding modules.
How to calculate average power consumption
PW =
3
7
×{(I5V×5) + (I15V×15) + (I24V×24)} (W)
W

Mitsubishi Q01CPU Specifications

General

Brand	Mitsubishi
Model	Q01CPU
Category	Controller
Language	English