YASKAWA SIEMENS CNC Series, Maintenance Manual, Serviceman Handbook

Page: 42 / 373

Installing the control panels
2.1.2 Thermal design of the enclosures
2-4
Internal temperature rise of a panel with an internal fan
The size of the enclosure is assumed 450 (W)
×
790 (H)
×
150 (D) mm.
The calculated internal temperature rise
Δ
T = 9.8 (
℃
), thus the temperature rise require-
ment of 10
℃
is satisfied.
If the temperature rise requirement is not satisfied, additional measure must be taken to
lower the temperature rise.
„ Capacity of heat exchangers
If an internal fan alone is not sufficient for satisfying the temperature rise requirement, a
heat exchanger must be installed (see the table below).
Table 2.2 Heat exchanger
Note: Capacity means the amount of heat that a heat exchanger can remove,
on the ground that the temperature rise must be kept 10
℃
or less.
Maximum internal heat that can be safely produced in a panel
equipped with a heat exchanger
Up to 359 W of internal heat can be safely produced in a panel if it is equipped with a heat
exchanger of table 2.2, as shown below.
• P
＝
k
・
A
・△
T
＋
110W/10
℃＝
6
×
4.16
×
10
＋
110
＝
359W/10
℃
• Effective surface area
A = 1.0155 (m
2
)
(the bottom surface is excluded as the panel is of stand-alone type)
• Internal heat produced P = 60 (W)
• Internal temperature rise
Type Designation Capacity Outside dimensions (mm)
DE9404550-1 REX1600ESYE
110W/10
℃
194 : (W) 800 : (H) 65 : (D)
EXAMPLE
450mm
150mm
790mm
△
T
＝
P
qe
P
k
･
A
＝ ＝
60
6
×
1.0155
＝
9.8
(℃)
EXAMPLE