9 Conditions of Acceptability
30 YASKAWA TOEP C710617 0SB YASKAWA AC Drive GA500 Installation Manual
■ Select External Heatsink by Thermal Resistance
Replace the value of Table 8.1 into the formula in Select External Heatsink by Thermal
Resistance on page 28.
The thermal resistance of the external heatsink “EF(98) L: 150“ is 1.6 K/W, so you can use
it. 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, so you
can use it. 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).
9 Conditions of Acceptability
Machines and devices integrated with this product must satisfy the following conditions
for compliance with UL standards.
Refer to the manuals packaged with the drive for additional UL compliance requirements.
1. Install finless-type drives into a ventilated enclosure with a minimum enclosure
volume shown in Table 9.1.
Table 9.1 Minimum Enclosure Volume
Model
Minimum Volume
cm
3
(in
3
)
B001 - B006
2001 - 2012
9850
(600)
B010 - B012
2018 - 2042
4001 - 4023
15750
(960)
2056 - 2070
4031, 4038
42000
(2560)
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