UMAX140610. LIN
– J1939 CAN Protocol Converter with PWM Output. Version 1
Page: 53-81
3.9 Diagnostic Function Block
There are several types of diagnostics supported by the converter. As described in Section
3.2.4, fault detection and reaction are associated with the output drive. In addition, it can also
detect/react to power supply over/under voltage measurements, a processor over-temperature,
or lost communication events.
Figure 26. 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 power supply error or temperature error, “
Fault Disables Outputs
” setpoint
can be selected to disable all the outputs. By default, a power supply under/over voltage or
over temperature condition will not shutoff the output.
In most cases, faults can be flagged as either a low or high occurrence. The min/max
thresholds for all diagnostics supported by the converter are listed in the table below. 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.
Table 32. Fault Detect Thresholds
See Section
See Section
See Section
Output Drive
N/A
N/A
Power Supply
Power Undervoltage
Threshold
Power Overvoltage
Threshold
