Technical information

30
230V FX Series Positioning Drive Reference Manual
Max Operating Losses
These values represent the losses associated with moving the load. These losses occur during
the conversion of AC input power to the proper voltage and current waveforms for the motor.
Shunt Regulation Losses
These values represent the losses created when the motor and load are decelerated to a stop
faster than friction would stop the system. During this condition, the motor becomes a
generator and transfers energy back into the amplifier. This energy is dissipated through the
shunt regulator. The amount of energy dissipated varies depending on the application.
The values shown in the table below represent the maximum dissipation that occurs for most
applications. These values should be increased for applications that combine high motor
speed ( >2000 RPM), large load inertia (more than 5 times the motor inertia), fast deceleration
rates (faster than friction would stop the system) and a high percentage (>30%) of time in the
deceleration phase of indexing.
* Maximum Total Losses (Watts) = PSB + PMO + PSR
Calculating Total Power Losses
Total power dissipation is calculated by adding the values in the stand-by, maximum
operating and shunt regulator columns together. This total is shown in the maximum total
losses column which can be used to calculate proper enclosure size.
A less conservative approach would adjust the maximum operating losses by the percentage
of time the amplifier is actually moving the load.
For example, to calculate the operating losses (PO) of an application using an FX-455
operating near the maximum amplifier continuous power rating about 60 percent of the time,
we would calculate:
Drive
Model
Stand-by
Losses
(P
SB
) (Watts)
Maximum Operating
Losses
(P
MO
) (Watts)
Shunt Regulation
Losses
(P
SR
) (Watts)
Maximum Total
Losses*
(Watts)
FX-208 45 45 50 140
FX-316 45 70 85 200
FX-340 50 130 100 340
FX-455 55 175 220 450
FX-490 60 300 370 730
FX-4120 65 380 400 845
FX-6120 65 380 400 845
FX-6200 75 510 635 1220
FX-6300 85 740 925 1750
FX-8200 75 425 530 1030
FX-8300 85 635 800 1520
FX-8400 90 850 1000 1940