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, which is sufficient. 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).