YASKAWA UAK series User Manual page 121

6 Installation
6.2.2 Thermal Design of Control Panel
(2) Air Temperature Rise inside Control Panel (Average Temperature Rise)
Design the control panel so that the internal air temperature will be no more than 10°C higher than the refer-
ence value. If the rise in air temperature in the control panel exceeds 10°C, a cooling system must be installed.
For details, refer to 6.2.2 (3) Cooling System Installation.
The calculation formula for internal temperature rise for a control panel made of metal sheets is as follows:
∆T =
• ∆T: Temperature rise in the control panel
• P:
• qe: Heat flow through ratio of the control panel (W/°C)
• k:
• A: Effective radiation area of the control panel (m
<Example>
Allowable Watt Data Loss for a Control Panel with a Stirring Fan
450 mm
• Effective radiation area of the control panel: A=1.0155 (m
(Exclude the base area because control panel is type of putting on the floor.)
• Calorific value in the control panel: P=60 (W)
• Temperature rise value in the control panel: ∆T=
This example is correct design because ∆T is equal to 9.8 (°C).
6-8
P P
=
qe
k A
Calorific value in the control panel
Heat pass through ratio of a metal plate
2
With a stirring fan: 6 W/m
Without a stirring fan: 4 W/m
∗ Radiation available area of the control panel surface area (Exclude the surface which contacts other object)
150 mm
(°C)
(W)
2
°C)
(W/m
°C
2
°C
2 *
)
2
P P
=
qe
k A
)
60
= =9.8 (°C)
6 ×1.0155