Quantum MP User Guide
21
Issue: A4 www.emersonct.com
Figure 3-9 Enclosure layout size 2
3.5.2 Enclosure sizing
on page 147 for drive losses.
Add the dissipation figures for each drive that is to be installed in the
enclosure.
Add the power dissipation figures for each EMC filter that is to be
installed in the enclosure.
Calculate the total heat dissipation (in Watts) of any other equipment to
be installed in the enclosure.
Add the figures of all of the above to get a total heat dissipation figure (in
Watts) for the equipment in the enclosure.
Calculating the size of a sealed enclosure
The enclosure transfers internally generated heat into the surrounding
air by natural convection. The larger the surface area of the enclosure
walls, the better is the dissipation capability. Only the surfaces of the
enclosure that are not in contact with a wall or floor can dissipate heat.
Calculate the minimum required unobstructed surface area A
e
for the
enclosure from:
Where:
A
e
Unobstructed surface area in m
2
(1 m
2
= 10.9 ft
2
)
T
ext
Maximum expected temperature in
o
C outside the
L1
L2
L3
A+
A-
GND
GND
DANGER
HIGH VOLTAGE
DANGER
HIGH VOLTAGE
325 mm*
(13 in)
325 mm*
(13 in)
>100 mm
(4 in)
>100 mm
(4 in)
External
Controller
Signal cables
Plan for all signal cables
to be routed at least
300mm (12 in) from the
drive and any power cables
Armature
connection
cable
Ensure minimum clearances
are maintained for the drive.
Forced convection air-flow
must not be restricted by any
object of cabling.
AC supply, contactor,
line chokes
Note
For EMC compliance
1) Power cabling must be at
least 100 mm (4 in) from the
drive in all directions
2) Ensure direct metal contact
at drive and filter mounting
points (any paint must be
removed)
* Minimum wire bending space required by UL508 for final customer power connections.
Field
conection cable
A
e
P
k T
int
T
ext
–
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