Nidec Unidrive M600 Series - Page 102

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102 Unidrive M Regen Design Guide
Issue Number: 4
5.5.1 Enclosure layout
Please observe the clearances in the diagram below for the Unidrive M plus also take into account any clearances required for other devices /
auxiliary equipment when planning the installation.
Figure 5-36 Enclosure layout
5.5.2 Enclosure sizing
1. Add the dissipation figures from Chapter 10 Technical data for each drive that is to be installed in the enclosure.
2. Calculate the total heat dissipation (in Watts) of any other equipment to be installed in the enclosure.
• EMC filter
• Switching frequency filter
• Regen choke
3. 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:
±DC bus connections
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3 phase
AC supply,
PE, contactor
isolator
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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
External
controller
AA
A
Size : 0 mm (0 in)3
Sizes to : 30 mm (1.181 in)48
Sizes 9 to 11 : 45 mm (1.77 in)
A
Regen drive Motoring drive
B B
B
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Regen
components
Cubicle layout must take into
account the additional Regen
components required ensuring
suitable clearances are allowed.
Sensitive components should
not be placed above heat
producing components such as
the Regen inductor.
B
B
100 mm (4 in)
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Standard wiring
practices apply
A
e
P
kT
int
T
ext
–()
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