ADM00902 Demonstration Board for EMC2103 User’s Guide
DS50002905A-page 20
2019 Microchip Technology Inc.
3.3.5.2
DEMO RPM OFFSET BUTTON
The
Demo RPM Offset
button (marked as
5.2
) opens a dialog box
(
) in which the Min RPM offset values can be configured. This relates only to
the fan control algorithm implemented in software for the demo application example.
For the Auto and Constant Demo modes, the algorithm uses a minimum RPM target
that consists of the minimum RPM value, specified in the
Fan Configuration
tab
(
, number
4
), summed with the offset value.
Due to the RPM jitter, if the fan target is set to the Min RPM value, a false fan Stall
detection can occur, causing the fan to be sped up unnecessarily, as the drive level
used for the initial spin-up (
, number
3
) has a minimum value of 30% (which
is larger than the Min Drive setting for this particular application).
Setting the RPM offset to 0 allows the demo to use the full RPM range.
FIGURE 3-5:
Demo Settings Dialog Box.
