YASKAWA
TOEP C710617 0SA YASKAWA AC Drive GA500 Installation Manual
25
■
Examine Feasibility of the Selected External Heatsink
When you select an external heatsink, if installation conditions, for example installation space,
limit your selection, use the formula to calculate the heatsink plate temperature and examine the
external heatsink.
If T
HSP
value is lower than the maximum temperature of the heatsink, you can use the selected
external heatsink.
Refer to
Monitor Heatsink Plate Temperature on page 10
to monitor drive heatsink plate
temperature.
◆
External Heatsink Selection
The examples show applicable heatsink selection for drive model 2006 when
C6-01 = 1
[Normal / Heavy Duty Selection = Normal Duty Rating]
.
These are examples of calculations for the external heatsink from MIZUTANI ELECTRIC IND.
CO., LTD.
•
Universal Type Heat Sink EF Series, EF (98) L:150 (thermal resistance Rθ
EHS
= 1.6 K/W)
•
Universal Type Heat Sink EK Series, EK (95) L:150 (thermal resistance Rθ
EHS
= 1.1 K/W)
Table 8.1 External Heatsink Selection
Symbol
Value
P
Loss
25.0 W
T
HSP_max
90 °C (194 °F)
T
Amb
40 °C (104 °F)
Rθ
HSP
0.05 K/W
Rθ
HSP-EHS
A
th
H = 128 mm
D = 68 mm
A
th
= 0.7 × 0.128 m × 0.068 m = 6.1 × 10
-3
m
2
λ
Comp
2.0 W/(m∙K)
Thermal conductivity of Oil-based compound X-23-7795 from Shin-Etsu
Chemical Co., Ltd.
d
Comp
100 μm
Recommended compound thickness (when applied)