Sizing An Enclosure; Transformer Sizing - Allen-Bradley Ultra1500 2092-DA1 User Manual

Sizing an Enclosure

As an additional aid in sizing an enclosure, with no active method of heat
dissipation, either of the following approximate equations can be used:
Metric
0.38Q
----------------------- -
A =
1.8T 1.1 –
Where T is temperature difference between
inside air and outside ambient (°C), Q is heat
generated in enclosure (Watts), and A is
2
enclosure surface area (m ). The exterior surface
of all six sides of an enclosure is calculated as
A = 2dw + 2dh + 2wh
Where d (depth), w (width), and h (height) are in
meters.

Transformer Sizing

The Ultra1500 does not require isolation transformers. However, a
transformer may be required to match the voltage requirements of the
controller to the available service. To size a transformer for the Main power
inputs, the power output (KVA) of each axis must be known. This can be
derived by calculating the Watts for each axis. If you are supplying power to
more than one motor and an Ultra1500, simply add the kW ratings together
from each calculation to get a system kW total.
If using an autotransformer, ensure that the phase to
IMPORTANT
neutral/ground voltages do not exceed the input voltage
ratings of the drive.
Definitions:
kW = power or real power
KVA = apparent power
Transformer KVA rating = (Sum of average output power of each axis) x 2.0.
Installing Your Ultra1500
Standard English
4.08Q
----------------
A =
T 1.1 –
Where T is temperature difference between
inside air and outside ambient (°F), Q is heat
generated in enclosure (Watts), and A is
enclosure surface area (ft²). The exterior surface
of all six sides of an enclosure is calculated as
A = (2dw + 2dh + 2wh) / 144
Where d (depth), w (width), and h (height) are in
inches.
Publication 2092-UM001D-EN-P — July 2005
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