Mechanical Installation
2
2.10 Conditions
YASKAWA SIEPC71061753C GA500 Technical Manual 57
Symbol Value
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)
Select External Heatsink by Thermal Resistance
Replace the value of Table 2.35 into the formula in Select External Heatsink by Thermal Resistance on page 56.
The thermal resistance of the external heatsink “EF(98) L: 150“ is 1.6 K/W, which is sufficient. Yaskawa
recommends the external heatsink "EK (95) L: 150" to prevent overheat if there is a temporary temperature
increase or a decrease in the cooling capacity of the external heatsink because of dust and unwanted material.
Examine Feasibility of the Selected External Heatsink
The thermal resistance of the external heatsink “EF (98) L: 150“ is 1.6 K/W. You can use the formula to calculate
the heatsink plate temperature:
The temperature of the heatsink plate is lower than the maximum value of 90 °C, which is sufficient. Because the
thermal transfer area is 70% of the drive mounting area, and the environmental conditions can change because
dust and unwanted material can decrease the cooling capacity of the external heatsink, Yaskawa recommends “EK
(95) L: 150” heatsink to achieve Rθ
EHS
= 1.1 K/W (T
HSP
= 68.95 °C).
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