Altivar 38 - variable speed drive - user's manual

Mounting in a Wall-fixing or Floor-standing
Enclosure
Observe the mounting recommendations on the previous page.
To ensure proper air circulation in the drive:
- Fit ventilation grilles
- Ensure that ventilation is adequate: if not, install
forced ventilation with a filter
- Use special IP 54 filters
Dust and damp proof metal wall-fixing or floor-standing
enclosure (IP 54 degree of protection)
The drive must be mounted in a dust and damp proof casing in certain environmental conditions: dust,
corrosive gases, high humidity with risk of condensation and dripping water, splashing liquid, etc.
ENGLISH
To avoid hot spots in the drive, add a fan to circulate the air inside the enclosure, reference VW3A5882• (see
ATV38 catalogue).
This enables the drive to be used in an enclosure where the maximum internal temperature can reach 60 °C.
Calculating the size of the enclosure
Maximum thermal resistance Rth (°C/W) :
Rth =
θ° - θ°e
P
θ° = maximum temperature inside enclosure in °C
θ°e = maximum external temperature in °C
P = total power dissipated in the enclosure in W
Power dissipated by the drive: see section Selecting a drive.
Add the power dissipated by the other equipment components.
Useful heat dissipation surface of enclosure S (m 2 ):
(sides + top + front panel if wall-mounted)
S =
K
Rth
K = enclosure thermal resistance per m 2
For metal enclosure:
K = 0.12 with internal fan
K = 0.15 without fan
Caution: Do not use insulated enclosures, as they have a poor level of conductivity.
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