ElmoMC SimplIQ Digital Servo Drives-Whistle Installation Guide - Manual (Page 51)

Whistle and Tweeter Installation Guide Installation
MAN-WHTWIG (Ver. 1.604)
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51
3.15.3. How to Use the Charts
The charts above are based upon theoretical worst-case conditions. Actual test results show
30% - 50% better power dissipation.
To determine if your application needs a heatsink:
1. Allow maximum heatsink temperature to be 80 °C or less.
2. Determine the ambient operating temperature of the Whistle.
3. Calculate the allowable temperature increase as follows:
 for an ambient temperature of 40 °C , ΔT= 80°C – 40 °C = 40 °C
4. Use the chart to find the actual dissipation power of the drive. Follow the voltage curve to
the desired output current and then find the dissipated power.
5. If the dissipated power is below 4 W the Whistle will need no additional cooling.
Notes:
The chart above shows that no heatsink is needed when the heatsink temperature is 80 °C,
ambient temperature is 40 °C and heat dissipated is 4 Watts.
When an external heatsink is required, you can use the Elmo external heatsink (Catalog
number: WHI-HEATSINK-2) – see Figure 4.
3.15.4. Tweeter Thermal Data
The best way to dissipate heat from the Tweeter is to mount it so that its lower board faces
upward. For best results leave approximately 10 mm of space between the Tweeter's lower
board and any other assembly.