Technical information

29
Installation
* Maximum Total Losses (Watts) = PSB + PMO + PSR
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.
TRMS *Vmax / 850 + Plp + Psr = Total power losses (Watts)
Where:
TRMS = RMS torque for the application (lb-in)
Vmax = Maximum motor speed in application (RPM)
Ke = Voltage constant of the motor (Vrms / kRPM)
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.
Stand-by Losses
These values represent the losses generated when the amplifier is enabled but not providing
torque to the load. These losses are due to the logic power generation, motor holding current
and other internal circuits. These losses occur whenever AC power is applied to the amplifier
(bridge and logic supply).
Drive Model
Logic Power Losses
(Plp) (Watts)
Maximum Power
Stage Losses
(Pmo) (Watts)
Maximum Shunt
Regulation Losses
(Psr) (Watts)
Maximum Total
Power Losses*
(Watts)
FX-208
45
45 30 120
FX-316 70 50 165
FX-340 130 75 255
FX-455 175 120 350
FX-490 300 250 610
FX-4120 380 250 695
FX-6120 380 250 695
FX-6200
60
500 400 975
FX-6300 740 400 1225
FX-8200 500 400 975
FX-8300 740 400 1225
FX-8400 850 400 1340