Enclosure Design And Drive Ambient Temperature; Heatsink Fan Operation - Emerson unidrive m200 User Manual

Safety Product Mechanical
information information installation
Example
To calculate the size of an enclosure for the following:
• Three drives operating at the Normal Duty rating
• External EMC filter for each drive
• Braking resistors are to be mounted outside the enclosure
Maximum ambient temperature inside the enclosure: 40 °C
•
Maximum ambient temperature outside the enclosure: 30 °C
•
For example, dissipation of each drive: 101 W and dissipation of each
external EMC filter: 6.9 W (max).
Total dissipation: 3 x (101 + 6.9) = 323.7 W
Insert the following values:
40 °C
T
int
30 °C
T
ext
k 1.3
P 323.7 W
Then:
× ×
3 1.3 323.7
-------------------------------------- -
=
V
–
40 30
3 3
= 126.2 m /hr (74.5 ft
3.7 Enclosure design and drive ambient
temperature
Drive derating is required for operation in high ambient temperatures
Totally enclosing or through panel mounting the drive in either a sealed
cabinet (no airflow) or in a well ventilated cabinet makes a significant
difference on drive cooling.
The chosen method affects the ambient temperature value (T
should be used for any necessary derating to ensure sufficient cooling
for the whole of the drive.
The ambient temperature for the four different combinations is defined
below:
1. Totally enclosed with no air flow (<2 m/s) over the drive
T = T + 5 °C
rate int
2. Totally enclosed with air flow (>2 m/s) over the drive
T = T
rate int
3. Through panel mounted with no airflow (<2 m/s) over the drive
T = the greater of T +5 °C, or T
rate ext
4. Through panel mounted with air flow (>2 m/s) over the drive
T = the greater of T or T
rate ext
Where:
T = Temperature outside the cabinet
ext
T = Temperature inside the cabinet
int
T = Temperature used to select current rating from tables in
rate
Chapter 11 Technical data on page 159.
3.8

Heatsink fan operation

The drive is ventilated by an internal heatsink fan. The fan channels air
through the heatsink chamber.
Ensure the minimum clearances around the drive are maintained to
allow air to flow freely.
The heatsink fan on all drive sizes is a variable speed fan. The drive
controls the speed at which the fan runs based on the temperature of the
heatsink and the drive's thermal model system. The maximum speed at
which the fan operates can be limited in Pr 06.045. This could incur an
output current derating. Refer to section 3.12.1 Fan removal
procedure on page 44 for information on fan removal. The size 6 is also
installed with a variable speed fan to ventilate the capacitor bank. The
heatsink fan on the size 5 to 6 is supplied internally by the drive.
36
Electrical Getting Basic
installation started parameters
3 3
/min) (1 m / hr = 0.59 ft /min)
rate
int
int
Running the NV Media
Optimization
motor Card
) which
Advanced
Technical data Diagnostics
parameters
Unidrive M200 / M201 User Guide
Issue Number: 4
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