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48
Affinity User Guide
www.controltechniques.com Issue Number: 5
3.6 Enclosure for standard drives
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 3-42 Enclosure layout
3.6.2 Enclosure sizing
1. Add the dissipation figures from section 12.1.2
page 233 for each drive that is to be installed in the enclosure.
2. If an external EMC filter is to be used with each drive, add the
dissipation figures from section 12.2.1
page 247 for each external EMC filter that is to be installed in the
enclosure.
3. If the braking resistor is to be mounted inside the enclosure, add the
average power figures from for each braking resistor that is to be
installed in the enclosure.
4. Calculate the total heat dissipation (in Watts) of any other equipment
to be installed in the enclosure.
5. Add the heat dissipation figures obtained above. This gives a figure
in Watts for the total heat that will be dissipated inside the enclosure.
Calculating the size of a sealed enclosure
The enclosure transfers internally generated heat into the surrounding
air by natural convection (or external forced air flow); the greater the
surface area of the enclosure walls, the better is the dissipation
capability. Only the surfaces of the enclosure that are unobstructed (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
enclosure
T
int
Maximum permissible temperature in
o
C
inside
the
enclosure
P
Power in Watts dissipated by
all
heat sources in the
enclosure
k
Heat transmission coefficient of the enclosure material
in W/m
2
/
o
C
Example
To calculate the size of an enclosure for the following:
•
Two BA1406 models operating at the Normal Duty rating
•
Each drive to operate at 6kHz PWM switching frequency
•
Schaffner 16 A (4200-6119) 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
≥
100mm
(4in)
Enclosure
AC supply
contactor and
fuses or MCB
Locate as
required
Locate as
required
External
controller
Signal cables
Plan for all signal cables
to be routed at least
300mm (12in) from the
drive and any power cable
Ensure minimum clearances
are maintained for the drive
and external EMC filter. Forced
or convection air-flow must not
be restricted by any object or
cabling
≥
100mm
(4in)
Optional braking resistor and overload
Locate optional braking
resistor external to
cubicle (preferably near to or
on top of the cubicle).
Locate the overload protection
device as required
The external EMC filter can be
bookcase mounted (next to the
drive) or footprint mounted (with
the drive mounted onto the filter).
Note
For EMC compliance:
1) When using an external EMC
filter, one filter is required for
each drive
2) Power cabling must be at
least 100mm (4in) from the
drive in all directions
A
A Size 1: 0mm (0in)
Sizes 2 to 6: 30mm (1.181in)
≥
≥
A
A
e
P
k T
int
T
ext
–
(
)
-----------------------------------
=
Summary of Contents for Affinity
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