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28 Unidrive User Guide
www.controltechniques.com Issue Number: 9
3.9 Baffle plates
When a Unidrive size 1 to 4 is through-panel mounted, the fitting of a
baffle plate causes the heatsink to act as a chimney; this enhances the
air flow along the heatsink fins to aid cooling (this naturally occurs when
the drive is surface mounted).
You may make a baffle plate from any suitable conducting or non-
conducting material and attach it to the heatsink by the method
described as follows.
Figure 3-19 Dimensions for the fabrication of baffle plates for
model sizes 1 and 2
Attaching a fabricated baffle plate to the heatsink
Table 3-2 Methods of attaching the baffle plate
Figure 3-20 Dimensions for the fabrication of baffle plates for
model sizes 3 and 4
3.10 Ambient temperature
The maximum ambient temperature under which the drive can operate
without derating is 40°C.
Derating can be applied to allow operation up to 50°C ambient
temperature.
Please see section 11.1.1 Power and current ratings on page 190 if
derating is required.
Model size Method of attachment
1
2
Use the surface mounting brackets.
3
4
Use M6 x 12mm max (or equivalent) thread-forming screws to
screw into the holes in the heatsink, or tap the holes to a suitable
thread size.
3.228in 6.929in
1.614in
0.512in
1.535in
13.563in 14.449in
.2
in
2.146in
1.969
in
18.622in
17.236in
0.693in
7.154in
6.949in
4.724in
3.425in
22.047in
23.150in
3.780in
13.780in
3.583in 5.118in
0.276in
4.016in 7.697in
9.606in
189.5mm
7.461in
76mm
2.992in
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