Aux Output - Crown IQ-MC4 Reference Manual

5.2.1 AUX Output

When the auxiliary feature is turned on
by the IQ for Windows software +15
VDC is supplied across pins 3
(ground) and 4 (+). A total of 70
milliamps of current is available. The
smart switch mosfet protects against
shorts (see Figure 5.1).
Reference Manual
Figure 5.1 The Internal AUX Circuit
Figure 5.2 A Sample AUX Output Circuit
There are many possible uses for the
AUX output. For example, it can be
used to turn on auxiliary cooling fans.
To do this the AUX connector might
be used to close a relay. The relay
would then turn the fans on or off. This
is shown in Figure 5.2.
+15 VDC
SMART
MOSFET
IQ-MC Modules
internal
control
logic
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