Xylem IM131R01 AQUAVAR AV II - Manual (Page 15)

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Electrical Connections continued
Step 5 - Considerations for Mounting AQUAVAR Controllers
in Host Enclosures
The AQUAVAR controller is available from stock in a variety of enclosures that meet the requirements
of almost any application. Yet, special applications (such as use in washdown environments or in
integrated systems) may make it desirable to mount AQUAVAR controllers in a host enclosure.
When the AQUAVAR controllers are mounted in a host enclosure, the watts dissipated by the drives
must be dissipated by the host enclosure. If this is not accomplished, the control circuitry of the
AQUAVAR controller will be damaged.
Two techniques are available for mounting AQUAVAR controllers in a host enclosure:
• The controllers may be entirely enclosed in the host enclosure or
• The controllers may be mounted with their cooling fins outside of the host enclosure.
The following sections discuss these two mounting techniques in greater detail.
Models Entirely Enclosed in the Host Enclosure
When an AQUAVAR controller is entirely enclosed in a host enclosure, the host enclosure must be
properly sized to dissipate the heat generated by the controller and any other power-dissipated
by the various models of the AQUAVAR controller at various switching frequencies. Use this
information to adequately size the host enclosure.
Models with Fins External to the Host Enclosure
By mounting an AQUAVAR controller so that its heatsink fins are outside of the host enclosure, you
may select a smaller host enclosure than that required when the controller is mounted entirely
inside the host enclosure. For most applications with this type of mounting, typically you will not
need such additional cooling devices as fans, heat exchangers or air conditioners.
The amount by which the load on the host enclosure is reduced is the amount of watts dissipated
by the heatsinks of the controllers. Table 3 shows the watts dissipated by each AQUAVAR model
after deducting the amount of watts dissipated by the heatsinks of the model. Use the values
shown in the table to adequately size the host enclosure.
Installation Procedures