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3. Installation
3.3 Installation
10
3.3.3 Heat Radiation Countermeasures
In normal NC units, the electric cabinet thermal design is so the electric cabinet ambient temperature is
a 0 to 45°C usage condition, and the electric cabinet internal temperature rise is 10°C. However, these
conditions do not necessarily apply in MELDASMAGIC64.
This is because the operation of all Mitsubishi-supplied units, including the NC Card, is guaranteed up
to 55°C, but the operation of the personal computer is not necessarily guaranteed up to 55°C.
Thus, the electric cabinet ambient temperature must first be determined as shown below.
(1) Determine the electric cabinet ambient temperature T
a
.
Ex. 0 to 35°C
(2) Determine the internal temperature rise ∆T.
Ex. 5°C
(3) Select a personal computer.
When T
a
max. = 35°C and ∆T = 5°C, the personal computer must have a guaranteed operating
temperature of 40°C or more (45°C or more for a margin of safety).
(4) In this example, the average temperature in the electric cabinet will be 40°C or less according to
(1) and (2).
(Note) 1. When heat accumulates in upper areas, etc., of the unit, circulate the air inside the electric
cabinet using a circulation fan.
2. Use an electric cabinet cooler when required.
Use an electric cabinet cooler type that does not take outside air into the electric cabinet.
3. If the personal computer's heat builds up in the personal computer, circulate the air in the
personal computer with a fan.
Back fan
Front fan
NC card