8 External Heatsink Selection
YASKAWA TOEP C710617 0SB YASKAWA AC Drive GA500 Installation Manual 27
◆ Necessary Data for External Heatsink Selection
Symbol Description
P
Loss
Drive heatsink watt loss (W)
*1
T
HSP_max
Maximum heatsink plate temperature
This is the temperature at the surface of the heatsink plate. Set U4-08
[Heatsink Temperature] to monitor the drive heatsink temperature.
Maximum temperatures are different for different models.
• B001 - B012: 90 °C (194 °F)
• 2001 - 2021: 90 °C (194 °F)
• 2030 - 2070: 80 °C (176 °F)
• 4001 - 4012: 90 °C (194 °F)
• 4018 - 4038: 80 °C (176 °F)
T
Amb
Ambient temperature of the external heatsink
Rθ
HSP
Drive heatsink plate thermal resistance
This value is 0.05 K/W.
Rθ
HSP-EHS
You can use the formula to calculate thermal resistance between the drive
heatsink plate and the external heatsink.
A
th
Heat transfer area between drive heatsink plate and external
heatsink
Note:
Heat generation across the drive heatsink plate is not
equal because of the arrangement of internal
components. The effective area for thermal transfer is
only 70% of the drive heatsink plate area.
Use the H and W values of the drive exterior dimensions
*2
to calculate the area of the drive heatsink plate.
λ
Comp
Thermal conductivity of the thermal compound
d
Comp
Thickness of the thermal compound (when applied)
Rθ
EHS
Thermal Resistance of the external heatsink
*1 Refer to Drive Watt Loss on page 13 for information.
*2 Refer to Drive Exterior and Mounting Dimensions on page 22 for information.
◆ External Heatsink Selection Methods
Keep the drive heatsink plate temperature lower than the maximum temperature in all
ambient temperatures. Select an applicable external heatsink for your application.
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