External Heatsink Selection; Necessary Data For External Heatsink Selection - YASKAWA GA500 Series Installation Manual

8

External Heatsink Selection

This section gives information about how to to select an applicable external heatsink.
◆

Necessary Data for External Heatsink Selection

Symbol
P
Loss
T
HSP_max
T
Amb
Rθ
HSP
Rθ
HSP-EHS
Rθ
EHS
*1 Refer to Drive Watt Loss on page 12
*2 Refer to Drive Exterior and Mounting Dimensions on page 20
YASKAWA TOEP C710617 0SA YASKAWA AC Drive GA500 Installation Manual
Drive heatsink watt loss (W)
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)
• 4001 - 4012: 90 °C (194 °F)
Ambient temperature of the external heatsink
Drive heatsink plate thermal resistance
This value is 0.05 K/W.
You can use the formula to calculate thermal resistance between the drive
heatsink plate and the external heatsink.
Heat transfer area between drive heatsink plate and external
heatsink
Note:
Heat generation across the drive heatsink plate is not equal
A
th
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
calculate the area of the drive heatsink plate.
λ Thermal conductivity of the thermal compound
Comp
d Thickness of the thermal compound (when applied)
Comp
Thermal Resistance of the external heatsink
for information.
8 External Heatsink Selection
Description
*1
for information.
*2
to
23