Enclosure; Figure 3-17 Enclosure Layout - Emerson MP25A4 User Manual

Safety Product Mechanical
Information information Installation
3.6

Enclosure

3.6.1 Enclosure layout
Please observe the clearances in the diagram below taking into account any appropriate notes for other devices / auxiliary equipment when planning
the installation.

Figure 3-17 Enclosure layout

Ensure minimum clearances
are maintained for the drive.
Forced or convection air-flow
must not be restricted by any
object or cabling
Signal cables
Plan for all signal cables
to be routed at least
300mm (12in) from the
drive and any power cable
External
controller
Auxillary
supply
3.6.2 Enclosure sizing
Refer to section 12.1.2 Typical short-term overload limits on page 145
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
enclosure from:
P
--------------------------------------- -
A =
e ( )
k T – T
int ext
26
Electrical Getting Basic
installation started parameters
Enclosure
≥100mm
(4in)
MA1
MA2
Armature
connection
cable
connection cable
for the
e
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Running the SMARTCARD
Optimization
motor operation
AC supply contactor,
line chokes and fuses
A
≥100mm
A
Field
Where:
A Unobstructed surface area in m
e
T Maximum expected temperature in
ext
enclosure
T Maximum permissible temperature in
int
enclosure
P Power in Watts dissipated by all heat sources in the
enclosure
k Heat transmission coefficient of the enclosure material
2 o
in W/m / C
Example
To calculate the size of an enclosure for the following:
• Two MP25A4 models operating under full load conditions
• Maximum ambient temperature inside the enclosure: 40°C
• Maximum ambient temperature outside the enclosure: 30°C
Dissipation of each drive: 125W
Dissipation from other heat generating equipment in the enclosure. 11W
(max).
Total dissipation: 2 x (125 + 11) = 272W
Onboard Advanced Technical
PLC parameters data
Note
For EMC compliance:
1) Power cabling must be at
least 100mm (4in) from the
(4in)
drive in all directions
2) Ensure direct metal contact
at drive and filter mounting
points (any paint must be
removed)
A
100mm for Size 1 drives
200mm for Size 2A/2B drives
Note
For Size 2C/2D drives
leave a clearance of 100mm
around the drive.
2 2
(1 m = 10.9 ft
o
C outside the
o
C inside the
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