Emerson Control Techniques EN Series Installation Manual page 71

EN Drive Installation Manual
Power Dissipation Calculation
Calculating actual dissipation requirements in an application can help minimize enclosure
cooling requirements, especially in multi-axis systems. To calculate dissipation in a specific
application, use the following formula for each axis and then total them up. This formula is a
generalization and will result in a conservative estimate for power losses.
=
TPL
Where:
TPL = Total Power Losses (Watts)
TRMS = RMS Torque for the application (lb-in)
Vmax = Maximum motor speed in application (RPM)
Pld = Logic Power Losses Drive (Watts)
Psr = Shunt Regulation Losses (Watts)-(RSR-2 losses
or equivalent)
Note
TRMS * Vmax / 1500 = Power Stage Dissipation = Pp
A more accurate calculation would include even more specifics such as actual torque
delivered at each speed plus actual shunt regulator usage. For help in calculating these please
contact our Application Department with your system profiles and loads.
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•
TRMS Vmax
+
Pld
1500
+
Psr