3. General Specifications (Environment Conditions)
3.5 Heat Radiation Countermeasures
16
(2) Calculation of operation panel cooling capacity
Tolerance value for temperature rise (
Δ
t)
Panel internal temperature (according to each unit’s specification) T
≤
55C°
Panel peripheral temperature (according to machine’s specification) Ta
≤
45C°
Tolerance value for internal temperature rise
Δ
T = 10C° (T – Ta)
Heat radiation area (A)
The surface of the molded unit, which has lower radiation capacity than the metal plate surface,
should be excluded for the heat radiation area in principle.
The bottom of the operation panel, which has difficulty in radiating due to the temperature
distribution, should also be excluded for the heat radiation area in principle.
Heat radiation area A = 0.71mm
2
(
≒
0.6 × 0.12 + 0.6 × 0.5 × 2 – (0.26 + 0.14) × 0.2 + 0.12 × 0.5 × 2)
(Top surface) (Front, rear surface) (Unit surface) (Both sides surface)
Operation panel cooling capacity (W1)
Calculate the cooling capacity to keep the temperature rise in the operation panel less than 10°C.
Cooling capacity W1 = 42.6W (6 × A ×
Δ
T)
(3) Comparison of heating value and operation panel cooling capacity
The operation panel cooling capacity is over the heating value, which presumed no need to install
the heat exchanger.
(4) Confirmation with the actual machine
The result of the calculation above is only a rough indication. The actual temperature rise may differ
according to the structure of the operation panel.
Be sure to confirm the temperature rise value in the operation panel when the machine is running.