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Selecting An Enclosure
The EMERSON EMC Positioning Drive is designed for the industrial environment. However,
no sophisticated electronic system can tolerate certain atmospheric contaminants such as
moisture, oils, conductive dust and metallic particles. Therefore, if the drive is going to be
subjected to this type of environment, we strongly urge you to mount your drive in a NEMA type
12 enclosure. Proper ventilation and filtering should also be provided. Amplifier losses should
be considered for enclosure sizing and ventilation.
Amplifier Losses
The exact power losses in any application depend on the application. The following table losses
would represent typical examples. The bridge power losses and shunt power losses can be
derated based on any duty cycle for power demand.
The logic supply power consumption varies based on PCM modules. For all 120 VAC models,
the logic power consumption is about 60 watts for the 230 VAC models. The consumption is
about 100 watts.
The next consideration would be bridge power losses which vary by amplifier size. The table
represents losses based on maximum continuous output current to the motor.
In applications where constant acceleration and deceleration occur, additional losses occur in the
shunt regulator where energy stored in the rotating inertia is commutated to the drives BUS
capacitors. This energy causes the BUS voltage to increase and once sensed, the excess voltage
is shorted through a load resistor. These losses could easily equal the bridge power losses.
Table IX
Amplifier Losses (By Model)
Model
Logic Supply
Bridge Losses
Shunt Losses
Total
DXA-202
60W
10W
10W
80W
DXA-206
60W
25W
25W
110W
DXA-308
60W
45W
45W
150W
DXA-318
60W
100W
100W
260W
DXA-430
60W
130W
130W
320W
DXA-450
60W
200W
200W
460W
DXA-480
60W
340W
340W
740W
DXA-780
60W
340W
340W
740W
DXA-7120
60W
340W
340W
740W
DXA-6120
100W
400W
400W
900W
DXA-6200
100W
700W
700W
1500W
DXA-6300
100W
1000W
1000W
2100W
DXA-8200
100W
700W
700W
1500W
DXA-8300
100W
1000W
1000W
2100W
DXA-8400
100W
1500W
1500W
3100W
System Troubleshooting
If you encounter a system problem, double check the installation instructions. These instructions
eliminate most of the problems encountered. If you have a problem, call EMERSON EMC at
(612) 474-8833 and ask for Customer Service Department.
AMPLIFIER MOUNTING INFORMATION
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