UMAX090600 Version 1
Preliminary Documentation – May be Subject to Change
14-48
1.6.
Diagnostic Function Block
There are several types of diagnostics supported by the CAN-BC-LED Controller. As described in
Section 1.3, fault detection and reaction is associated with battery charge. The CAN-BC-LED can
also detect/react to power supply over/under voltage measurements, a processor over-temperature,
or lost communication events.
Figure 4: Diagnostics Function Block
The
Fault Detection is Enabled
is the most important setpoint associated with this function block,
and it should be selected first. Changing it will result in other setpoints being enabled/disabled as
appropriate. When disabled, all diagnostic behaviour associated with the output or event in question
is ignored (i.e. this type of fault will not disable the output.)
In the case of a battery voltage error, it can be selected to disable the battery charging operation. By
default, a battery voltage under or over voltage condition will not shutoff the outputs.
However, power supply over and under voltage errors will cause the battery charging operation to
be disabled until the power supply voltage returns to normal operational range.
In most cases, faults can be flagged as either a low or high occurrence. The min/max thresholds for
all diagnostics supported by the CAN-BC-LED are listed in
Table 3
. Bolded values are user
configurable setpoints. Some diagnostics react only to a single condition, in which case a N/A is
listed in one of the columns.
