YASKAWA
TOEP C710617 0SA YASKAWA AC Drive GA500 Installation Manual
23
8
External Heatsink Selection
This section gives information about how to to select an applicable external heatsink.
◆
Necessary Data for External Heatsink Selection
Symbol
Description
P
Loss
Drive heatsink watt loss (W)
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)
•
4001 - 4012: 90 °C (194 °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
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
for information.
*2
Refer to
Drive Exterior and Mounting Dimensions on page 20
for information.