Mechanical Installation
2
2.10 Conditions
YASKAWA SIEPC71061753C GA500 Technical Manual 55
A - L8-35 = 3 [External Heatsink] (default setting) B - L8-35 = 0 [IP20/UL Open Type] (0.5 m/s of
airflow around the drive is necessary)
Figure 2.18 Derating Depending on Drive Installation Method
◆ External Heatsink Selection
This section gives information about how to select an applicable external heatsink.
■ 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 50 for information.
*2 Refer to Drive Exterior and Mounting Dimensions on page 344 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.
Figure 2.19 shows the thermal transfer principle from the drive heatsink plate to the ambient air of the external
heatsink.
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