Enclosure For Standard Drives; Figure 3-33 Enclosure Layout - Emerson unidrive sp User Manual

Safety Product Mechanical
Information Information Installation
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 3-33 Enclosure layout

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
The external EMC filter can be
bookcase mounted (next to the
drive) or footprint mounted (with
the drive mounted onto the filter).
External
controller
Signal cables
Plan for all signal cables
to be routed at least
300mm (12in) from the
drive and any power cable
3.6.2 Enclosure sizing
1. Add the dissipation figures from section 12.1.2 Power dissipation on
page 268 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 EMC filter ratings on
page 280 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
enclosure from:
48
Electrical Getting Basic
installation Started parameters
Optional braking resistor and overload
Locate as Locate as
required required
Enclosure
AC supply
contactor and
fuses or MCB
e
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Running SMARTCARD
Optimization
the motor operation
≥100mm
(4in)
A A
≥100mm
(4in)
-----------------------------------
A =
e (
k T
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
in W/m
Example
To calculate the size of an enclosure for the following:
• Two SP1406 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
for the
• Maximum ambient temperature outside the enclosure: 30°C
Onboard Advanced Technical
PLC parameters Data
Locate optional braking
resistor external to
cubicle (preferably near to or
on top of the cubicle).
Locate the overload protection
device as required
A Size 0 and 1: 0mm (0in)
≥
≥
Sizes 2 to 6: 30mm (1.181in)
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
P
)
– T
int ext
2
(1 m
o
C outside the
2 o
/ C
Unidrive SP User Guide
UL Listing
Diagnostics
Information
2 2
= 10.9 ft )
o
C inside the
Issue Number: 13