YASKAWA GA500 series - Examine Feasibility of the Selected External Heatsink; External Heatsink Selection

8 External Heatsink Selection
YASKAWA TOEP C710617 0SB YASKAWA AC Drive GA500 Installation Manual 29
■ 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 11 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)