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3. Installation
3.3 Installation
11
Please refer to following method for heat radiation countermeasures method.
<Hypothetical conditions>
(1) Electric cabinet ambient temperature : T
a
(2) Internal temperature rise value : ∆T
d
(The value for the conventional NC is 10°C, but this temperature must be set to 10°C or
less (target value 5°C) for the MELDASMAGIC64.)
(3) Average temperature in electric cabinet : T
a
+ ∆T
d
<Supplement>
(1) Refer to "3.1 General Specifications" for the
heat generated by each unit.
(2) Enclosed electric cabinet (thin steel plate)
cooling capacity calculation equation
W1 = U × A × ∆T
d
U : 6W/m
2
× °C
with internal circulation fan
4W/m
2
× °C
without internal circulation fan
A : Effective heat radiation area (m
2
)
(Area where heat can be radiated from
electric cabinet)
<Caution>
When calculating the effective heat
radiation area, do not include the parts that
contact other objects.
(3) Points of caution for heat radiation
countermeasures when designing mounting
state
* Consider convection in electric cabinet
(eliminate heat spots)
* Collect hot air at suction port in heat
exchanger panel.
(4) Evaluation standards for internal
temperature rise distribution data
∆Tm (average value)
≤ ∆T
d
∆T
m
max (maximum value) ≤ (∆T
d
+ 5) °C
R (inconsistency ∆T
m
max - ∆T
m
min) ≤ 6°C
(Evaluate existence of heat spots)
∆T
m
: Internal temperature rise
measurement value
Mounting example and introduction to temperature (∆T) measurement locations (reference)
: Temperature rise measurement
points (example)
Relay panel, etc.
Internal
air flow
Heat exchanger
Air outlet
Air inlet
External
air flow
Procedures for heat design and verification
Calculate total heat generation of
each mounted unit (W)
Comparison of W and W1
W≤W1
Collection of internal temperature rise
distribution data
Mounting design
Improvements
Completion
Selection of heat exchanger
Evaluation
W
>
W1
∆
T
m
≤
∆
Td
∆
T
m
>
∆
Td
Calculate electric cabinet’s
cooling capacity (W1)
Example of heat radiation countermeasures