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AX3500 Motor Controller User’s Manual 205
Attaching the Controller Directly to a Chassis
board against a vertical surface as shown in the figure below will ensure a better natural
convection flow and is, therefore, recommended.
For high current applications, it is possible that the controller may heat up faster and to a
higher temperature than can be dissipated by the using natural convection alone.
In these applications, you should ensure that air flow exists to remove the heat from the
heat sink. In the most extreme use, you should consider using an external fan to circulate
air around the controller.
Attaching the Controller Directly to a Chassis
The AX3500 can be attached to a metal chassis to improve heat dissipation. For this pur-
pose the board has holes at the corners of the PCB, which can be used to fasten it to the
chassis.
Of course first it is necessary to remove the blue heat sink, which is mounted as standard.
A total of 7 screws for the AX3500 are required, four on the corners and three in the heat
sink area.
In order to avoid that components leads sticking out the back of the PCB make contact
with the chassis it is needed to interpose a metal bar (interposer) of thickness sufficient to
distance the PCB from the surface of the chassis.
FIGURE 117. Mount the controller against a vertical surface to maximize convection flow