Nidec Digitax HD M751 Base - Enclosure Sizing

Safety information Product information Mechanical installation Electrical installation Multi axis system design Technical data
30 Digitax HD M75X Series Installation and Technical Guide
Issue Number: 5
For compact multi axis installations, the rear venting kit allows drives to be vertically mounted one above the other, where this is the case, a minimum
clearance of 100 mm (3.94 in) should be maintained between drives.
Figure 3-17 Minimum clearance when vertical mounting
A current derate must be applied to the drive if the rear vent kit is installed. Derating information is provided in section 6.1 Drive technical data on
page 98.
Failure to do so may result in nuisance tripping.
3.10 Enclosure sizing
1. Add the dissipation figures from section 6.1.4 Power dissipation on page 104 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 6.1.28 EMC filter ratings on page 113 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 °C outside the enclosure
T
int
Maximum permissible temperature in °C inside the enclosure
³
100mm
(4in)
1
2
1. Enclosure back plate.
2. Enclosure rear panel.
NOTE
A
e
P
kT
int
T
ext
–
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